The latest news from theAvant Team
We’re happy to announce that the Mostro 700 Nitro has been released.
This is the most advanced Nitro in the Market and it’s the only one that incorporates the latest design techniques into a Nitro model.
Nitro pilots no longer need to feel left out of the new wave of RC Helicopter design because they now have not just a new Nitro but the most advanced Nitro ever built available.
The Mostro 700 Nitro is the first Modern nitro in the market that has all the modern design features normally found only in advanced electrics like the Mostro 700 electric.
The Mostro Nitro is available with both DFC or FA (Follower Arms) heads. Both heads feature the famous RigidCore dampening system.
A dampening system that allows rigidity to work at all head speeds including very low ones.
Features always wanted by Nitro pilots and enjoyed by electric pilots are now available in the Mostro Nitro.
A beautiful and sexy design makes the Mostro an attractive model that will turn heads at the flying field.
Sexy!
This is truly a new approach that we are introducing in the market.
When designing the Mostro, we wanted to have all the mechanics connected rigidly, without flexible elements unless dampening is required. The result was the design of what we call the Mostro “Monoblock” ( single block).
In the Monoblock design, all elements of the system that affect the gyro sensing are mounted in a rigid superstructure. No part rests on the flexible frames unless it needs dampening.
The Monoblock is actually the flying helicopter.
Everything in the Mostro nitro is readily and easily accessible. Repairs are a breeze and easy access to the engine is unparalleled.
Boom supports are a thing of the past. The machines need to look nicer. The technology is available so why not use it? Yes the obvious answer is Carbon Fiber. The lightness and extreme rigidity of the boom made out of carbon can only be enhanced when a much larger diameter boom is used. Also why round? Because round is the ideal cross-section to handle torque.
It is not only the shape of the boom that is important, but also how it is supported. In the Mostro we have two far away spaced boom clamps that decrease the bending force applied to the boom.
We also made the area of physical contact between the clamp and the boom very large so that the clamp pressure is spread across a larger area, protecting the tube from damage due to excessive tightening.
We wanted to have the shortest possible distance between the swashplate and servos without resorting to weird geometries, that forces the electronic FBL unit to fight back geometry that is not best suited to mimic what the radio control system’s gimbal does.
No matter what system you are using, the radio’s gimbal is composed of two potentiometers that measure two angles. Those angles are the horizontal and the vertical movements of the stick by your finger.
The best way to match that is to have symmetry in those two directions. The most critical direction in manoeuvres is the side to side movement, which is naturally better driven via two “mirror-image” configuration servos, so that manoeuvres like fast aileron tic-tocs are performed mostly by the mechanics and less by the electronics trying to compensate for the mechanics weird geometry. This results in a lessened delay between the FBL gyro sensors detection of an unintended movement created by odd geometry, and also a lessening of the correction that it has to do to compensate.
Rugged clutch sized for today’s 120 sized engines. No slipping or breaking due to our exclusive no-fatigue shoe spring design.
Very high frame rigidity is achieved with lightweight carbon frame stiffeners elements.
Really large volume of air cooling system allows leaner engine settings delivering more power than other systems.
Get your Nitro today by clicking here.
New Top Servo Plate for the New Non-Standard Servo Geometries
Several manufacturers are coming out with new servos that don’t fit the standard JR and Futaba servo geometry. Due to those new geometries we decided to develop an adjustable geometry top servo plate. The main difference is in that it has the servo posts mounting holes converted to slots for adjustability.
Avant RC.
Based on customer’s feedback we decided to make a new landing gear mold to widen the landing gear. The part will be shipping the week after next and will be available as an spare part and in future kits. Notice also that we made a new version of the frames for an even lower profile. The Landing gear now partially hides inside the canopy. The lower stance frame is a drop-in replacement for the original one and is currently shipping as the standard kit frame in all kits.
This is the red version of a new color scheme available as an optional set. There is also a neon yellow version pictured below. This version is being previewed in the new Mostro Nitro introduced at the IRCHA 2014 event.
The new color schemes will be available as optional parts. Kits will ship with the original canopies. The red scheme uses the same red boom and fin used in the original kit so only the canopy is different.
We have had several people ask us why the servo rods have a slight angle of inclination when at zero degrees pitch. Not knowing any better and seeing other incorrect designs where the linkage rods are perfectly vertical they wonder if there is a mistake in their setups.
We sometimes forget that not everyone is so into perfection and attention to detail so they might not be aware of the level of attention we place on even the slightest details.
When doing servo linkage geometry you need to take into consideration that the servos are rotating arms and not linear actuators. That being said it’s an inherent part of a rotating actuator device to have a component of travel that’s undesired and perpendicular to the travel of interest. This shift is usually called interaction error.
When designing the geometry one needs to take into account that interaction and try to minimize the effects of it during flight so that the electronics don’t have to work so hard to compensate for mechanical errors. It also help them in the PID engine algorithm calculations so that the deviations from the expected feedback are minimized and less correction is required.
We understand that from a marketing point of view a perfectly vertical linkage rod at zero degrees collective pitch looks very pretty but we are too much of perfectionist hardcore engineers to let marketing dictate the correct functioning of the mechanics instead of math.
To illustrate a simplified view of what we’re referring to please take a look at the following pictures.
In the first picture we can see how the Mostro’s swashplate to servo linkage rod is slightly shifted forward creating a slight angle when compared to a vertical line. This is done on purpose to minimize the effects of interaction.
As you can see in the next picture at a slight positive or negative pitch the link is vertical. This is where most of the flying happens because when your helicopter is flying it needs either a positive or negative pitch angle to generate lift and prevent it from falling. This is where you need to try to have the minimum amount of interaction and it’s why at this point it’s vertical.
In the next picture you can see that at full pitch the interaction angle now goes the opposite way and it’s half of the total angle cutting in half the potential interaction at full pitch travel.
Compare this to a poorly designed geometry. In this case the rods are vertically aligned and we agree that it looks really pretty because it seems nice and aligned but that where the pretty stops because when full pitch is applied the error from interaction is doubled due to the unnecessarily excessive angle that the fbl system needs to fight against.
You can see in this picture how a poorly designed geometry can increase the interaction error to double what it could be.
It’s this attention to details that make the Mostro such an amazingly awesome flying machine. You wouldn’t think that this level of attention to details is important but when to many are done in a machine design the result is a superbly flying machine. We will continue with a series of articles about design insights on the Mostro.
Hope this helps people understand how the interaction can be minimized with a properly designed geometry.
Avant RC.
Servo arm spacing is 17mm. Most people are using the secraft’s aluminum arms that break in case of a crash.
The stock ratio is:
First pulley 20T, optional 21T, 22T and 23T
Second pulley: 61T
Third Pinion: 17T
Fourth Main Gear: 58T
Ratio =(61/first pulley)*(58/17)
Ratios:
20T = 10.406
21T = 9.910
22T = 9.460
23T = 9.048
You can also use a fixed main gear tooth count of 208.12 and use the standard pulley tooth count.
20 : 208.12
21 : 208.12
22 : 208.12
23 : 208.12
Because:
208.12 / 20 = 10.406
208.12 / 21 = 9.910
208.12 / 22 = 9.460
208.12 / 23 = 9.049
Avant RC.
Avant Ball Links technology
Back on 2006 during the design of the Aurora there was one concern we had and that was the ball link systems currently in use by most helicopters. Being that the size of the engines have been increasing, for the most part the rest of the parts have been adapting but the ball link technology has not changed much to reflect this increase in stress loads.
We did a lot of testing using several different brands and although some were acceptable they still had the tendency to pop-out under certain repetitive high stress maneuvers.
Examining the how the ball links wear and what determined the likelihood of a ball failing we determined that we had to address a few aspects of the ball design to minimize the possibility of failure in flight.
Doing so presented several complications because what we wanted to do wasn’t easy to achieve without hurting other aspects of the performance.
From examination of the standard balls after use we found evidence of an edge deformation that could potential make the ball fail in flight.
Here’s a cross section view of a standard ball link:
In this detail you can see the typical wear that the ball will have after some use.
The reason for that is that the edge of the ball is stretched outward when the ball is pulled out of the ball link creating a shape like this after a while making it easier for the ball link to come out in flight.
The kind of plastic used in most ball links is good for compression but not so good for elongation (stretching). Due to this problem most manufacturers add rubber to the plastic formulation making it more resistant to elongation but with the unwanted side effect that it also makes it easier for the ball to pop out.
Most manufacturers try to find a balance between the two so that it gives a reasonable durability and not too much of a “rubbery” feel to it.
Let’s look at the Avant balls and a standard ball:
First you can see a cross section of both and an obvious difference in the cross section of the ring around the ball. This was the area with the most failures we found in the standard balls so a different shape and cross-section area was designed for the Avant ball link. From failure stress simulation and from actual crash results we now know that the ring around the ball is extremely strong and that the failure point is more likely be in the plastic around the rod section.
You can see the section where they differ. This profile shape is the result of research to make this ball more resilient to the effects from insertion and extraction.
On this detail you can see the advanced edge profile designed by Avant that’s used in the Avant ball links.
The way this profile works is by eliminating the stretching that happens when the ball is pulled out of the ball link
Or when it’s pushed into the ball link
This advanced edge shape also makes it possible to use the links in both sides without concerns making fine-tuning the helicopter much easier because you can use half turns to fine tune the response.
This profile allowed us to eliminate the rubber from the ball link making it much less “rubbery” and replace it with a special elastomer that has memory shape and that can be reactivated by heat. This makes the insertion and removal of the balls much harder and to the point that it’s very likely that you’ll need to use ball link pliers in most cases. We traded convenience of hand installation for more difficult pliers installation but with the added security of making it harder to come out.
Keep in mind that the important thing is to make sure your ball links are secure so check and make sure the balls don’t come out easily.
Can be used on both sides
Another Advantage of the technology used in the Avant Ball links is that because of the special profile they can be used in either side so half-a-turn adjustments are possible.
Hopes this explains this technology invented by Avant and how to use it.
Avant RC.
| Code | Description | MAP |
| AV950001 | Avant Mostro 700 Electric Radio Control Kit with DFC head | $ 949.00 |
| AV950002 | Avant Mostro 700 Electric Radio Control Kit with Follower Arms Head | $ 949.00 |
| AV960001 | Avant Mostro 700 Nitro Radio Control Kit with DFC head | $ 949.00 |
| AV960002 | Avant Mostro 700 Nitro Radio Control Kit with Follower Arms Head | $ 949.00 |
| SPARE PARTS | ||
| AV950080-Y | Avant Mostro 700 Electric Painted Fiberglass Canopy Neon Yellow | $ 100.00 |
| AV950080-R | Avant Mostro 700 Electric Painted Fiberglass Canopy Red | $ 100.00 |
| AV960080 | Avant Mostro 700 Nitro Painted Fiberglass Canopy Red | $ 100.00 |
| AV950085-Y | Avant Mostro 700 100% Carbon Tail Boom Neon Yellow | $ 59.99 |
| AV950085-R | Avant Mostro 700 100% Carbon Tail Boom Red | $ 59.99 |
| AV950306-Y | Avant Mostro Carbon Vertical Fin Neon Yellow | $ 19.99 |
| AV950306-R | Avant Mostro Carbon Vertical Fin Red | $ 19.99 |
| AV950100 | Avant Mostro 1mm x 10mm ID Shaft Spacer | $ 4.99 |
| AV950101 | Avant Mostro 12mm Collar | $ 9.99 |
| AV950102 | Avant Mostro Knurled Thumbscrew for Canopy | $ 7.99 |
| AV950103 | Avant Mostro Canopy Support Post | $ 8.99 |
| AV950104 | Avant Mostro Mounting Mini-Block | $ 4.99 |
| AV950105 | Avant Mostro 56mm Rails Spacer (2) | $ 11.99 |
| AV950106 | Avant Mostro 60mm Rails Spacer (2) | $ 11.99 |
| AV950107 | Avant Mostro Frames Support Spacer | $ 12.99 |
| AV950108 | Avant Mostro Swashplate Assembly | $ 48.99 |
| AV950109 | Avant Mostro Main Shaft | $ 21.99 |
| AV950110 | Avant Mostro 10mm Spindle | $ 11.99 |
| AV950111 | Avant Mostro Intermediate Shaft | $ 9.99 |
| AV950112 | Avant Mostro Top Servo Mounting Plate | $ 55.99 |
| AV950113 | Avant Mostro Bottom Gear Mechanics Plate | $ 59.99 |
| AV950114 | Avant Mostro Motor Mount Plate | $ 24.99 |
| AV950115 | Avant Mostro Gear Mechanics Pillar (2) | $ 9.99 |
| AV950116 | Avant Mostro Servo Side Post | $ 5.99 |
| AV950117 | Avant Mostro Back Servo Bushing Post | $ 6.99 |
| AV950118 | Avant Mostro CCPM Guide Post | $ 11.99 |
| AV950119 | Avant Mostro Top Main Shaft Bearing Block | $ 21.99 |
| AV950120 | Avant Mostro Main Gear Hub | $ 25.99 |
| AV950121 | Avant Mostro Landing Gear | $ 14.99 |
| AV950122 | Avant Mostro Boom Clamp | $ 11.99 |
| AV950123 | Avant Mostro CNC Machined Pushrod Guide Bracket | $ 9.99 |
| AV950124 | Avant Mostro Tail Servo Mount | $ 7.99 |
| AV950125 | Avant Mostro Tail Fin Support Bracket | $ 5.99 |
| AV950126 | Avant Mostro Tensioner Arm Torsion Spring | $ 7.99 |
| AV950128 | Avant Mostro Locking Bracket Torsion Spring | $ 7.99 |
| AV950130 | Avant Mostro DFC Yoke | $ 44.99 |
| AV950131 | Avant Mostro DFC Pitch Arm (2) | $ 25.99 |
| AV950132 | Avant Mostro DFC Pivot with Bearings and Setscrews (2) | $ 23.99 |
| AV950133 | Avant Mostro DFC Delrin Links with Threaded Rods and Ball Links (2) | $ 18.99 |
| AV950134 | Avant Mostro DFC Axle (1) | $ 9.99 |
| AV950140 | Avant Mostro Main Blade Grip Set of two grips | $ 69.99 |
| AV950141 | Avant Mostro CNC RigidCore™ Dampener set | $ 14.99 |
| AV950142 | Avant Mostro Main Blade Grip M5 Bushings 8mm OD (2) | $ 11.99 |
| AV950150 | Avant Mostro FA Yoke | $ 44.99 |
| AV950151 | Avant Mostro FA Pitch Arm (2) | $ 25.99 |
| AV950153 | Avant Mostro FA Turnbuckle Threaded Rods (2) | $ 15.99 |
| AV950160 | Avant Servo Arm Screw with integrated pin M3 (JR) (Qty 3) | $ 14.99 |
| AV950161 | Avant Servo Arm Screw with integrated pin M2.5 (FUT) (Qty 3) | $ 14.99 |
| AV950163 | Avant 16mm M2.6 Threaded Rods (3) | $ 5.99 |
| AV950164 | Avant Air Diverter Plate Bracket Spacer Post (2) | $ 8.99 |
| AV950165 | Avant Locking Bracket Spacer Post (2) | $ 8.99 |
| AV950166 | Avant 1mm Spacer for M3 Screws (2) | $ 5.99 |
| AV950180 | Avant Bladeholder/Caddy for the Mostro 700 | $ 14.99 |
| AV950181 | Avant Hook and Loop 30mm wide buckle strap Standard length (2) | $ 6.99 |
| AV950182 | Avant Hook and Loop 30mm wide buckle strap Long length (2) | $ 7.99 |
| AV950183 | Avant Velcro Sticky Back Tape for Canopy | $ 4.99 |
| AV950201 | Avant Mostro 20T Motor Pulley (6mm Shaft Kit default) | $ 16.99 |
| AV950202 | Avant Mostro 21T Motor Pulley (6mm Shaft) | $ 16.99 |
| AV950203 | Avant Mostro 22T Motor Pulley (6mm Shaft) | $ 16.99 |
| AV950204 | Avant Mostro 23T Motor Pulley (6mm Shaft) | $ 16.99 |
| AV950205 | Avant Mostro 20T Motor Pulley (8mm Shaft) | $ 16.99 |
| AV950206 | Avant Mostro 21T Motor Pulley (8mm Shaft) | $ 16.99 |
| AV950207 | Avant Mostro 22T Motor Pulley (8mm Shaft) | $ 16.99 |
| AV950208 | Avant Mostro 23T Motor Pulley (8mm Shaft) | $ 16.99 |
| AV950209 | Avant Mostro 25T Tail Pulley | $ 24.99 |
| AV950210 | Avant Mostro 26T Tail Pulley (Kit default) | $ 24.99 |
| AV950215 | Avant Mostro 37T Conical Tail Pulley with plate | $ 27.99 |
| AV950216 | Avant Mostro 61T Double One-Way Clutch Pulley | $ 45.99 |
| AV950217 | Avant Mostro 58T CNC Machined Helical Main Gear | $ 34.99 |
| AV950218 | Avant Mostro 17T Helical pinion | $ 16.99 |
| AV950219 | Avant Mostro Idler Pulley with Bearings (1) | $ 11.99 |
| AV950220 | Avant Mostro Idler Tensioner Arm with Bearings (1) | $ 11.99 |
| AV950221 | Avant Mostro Idler Arm Bearing Post | $ 7.99 |
| AV950222 | Avant Electric Mostro 700 Motor Belt | $ 22.99 |
| AV950223 | Avant Mostro 700 Tail Belt | $ 34.99 |
| AV950224 | Avant Mostro Tail Case with Cap and Bearings | $ 64.99 |
| AV950225 | Avant Mostro Metal Tail Blade Grip set of two with counter weight | $ 27.99 |
| AV950226 | Avant Mostro Tail Slider assembly | $ 32.99 |
| AV950227 | Avant Mostro Tail Pitch L-Lever with Bearings and Liner | $ 17.99 |
| AV950228 | Avant Mostro Tail Collar for 6mm Shaft | $ 6.99 |
| AV950229 | Avant Mostro Tail Idler Pulley Post | $ 9.99 |
| AV950230 | Avant Mostro Tail L Lever Support Bracket | $ 14.99 |
| AV950300 | Avant Mostro Electric Carbon Side Frame | $ 99.98 |
| AV950301 | Avant Mostro Electric Carbon Battery Sliding Plate | $ 22.99 |
| AV950302 | Avant Mostro Carbon Battery Rail Set for one frame | $ 14.99 |
| AV950303 | Avant Mostro ESC Carbon Plate | $ 11.99 |
| AV950304 | Avant Mostro CCPM guide Carbon Plate | $ 6.99 |
| AV950305 | Avant Mostro Air Diverter Carbon Plate | $ 11.99 |
| AV950307 | Avant Optional Electronics Mounting Side Plates | $ 16.99 |
| AV950308 | Avant Optional bottom ESC mounting plate Kit | $ 44.99 |
| AV950309 | Avant Carbon Servo Spacers (10) | $ 9.99 |
| AV950310 | Avant Mostro Carbon Pushrod with threaded ends | $ 14.99 |
| AV950311 | Avant Mostro Carbon Diverter Plate Bracket (2) | $ 11.99 |
| AV950312 | Avant Mostro Carbon Battery Tray Locking Bracket | $ 14.99 |
| AV950313 | Avant Mostro Knurled Thumbscrew for Air Diverter Plate | $ 7.99 |
| AV950314 | Avant Optional Horizontal Electronics Mounting Plate | $ 26.99 |
| AV950500 | Avant 12x24x6 Bearing (1) | $ 4.99 |
| AV950540 | Avant Mostro Main Blade Grip Bearing Spacer 16×1.0mm | $ 8.99 |
| AV950541 | Avant Tail Blade Grip Bearing Spacer 8×0.3mm | $ 5.99 |
| AV950550 | Avant M4x24mm Socket Head Cap Shouldered Screw and M4 Locknut | $ 4.99 |
| AV950551 | AV950551 Avant M4x18mm Socket Head Cap Shouldered Screw and M4 Locknut for 17T Pinion | $ 4.99 |
| AV950552 | AV950552 Avant Mostro Main blade Grips M5 Screws and locknuts | $ 11.99 |
| AV950800 | Avant Zero degree Alignment tool for Mostro 700 Bladegrips | $ 14.99 |
| AV950850 | Avant Mounting and connection kit for Kontronik Kosmik ESC | $ 28.99 |
| AV960400 | Avant Mostro Nitro Carbon Side Frame | $ 99.98 |
| AV960401 | Avant Mostro Nitro Bottom Plate | $ 11.99 |
| AV960402 | Avant Mostro Nitro Middle Stiffener Plate | $ 11.99 |
| AV960403 | Avant Mostro Nitro Top Stiffener Plate | $ 11.99 |
| AV960404 | Avant Mostro Nitro Battery Plate | $ 22.95 |
| AV960405 | Avant Mostro Nitro Side Frame Stiffener Plate | $ 11.99 |
| AV960406 | Avant Mostro Nitro Motor Bolts Plate (2) | $ 11.99 |
| AV960409 | Avant Mostro Nitro Hollow Main Shaft | $ 21.99 |
| AV960410 | Avant Mostro Nitro Clutch | $ 27.99 |
| AV960411 | Avant Mostro Nitro Clutch Bell | $ 22.99 |
| AV960412 | Avant Mostro Nitro Clutch Bell Liner | $ 6.99 |
| AV960413 | Avant Mostro Nitro Clutch Stack Hollow Threaded Shaft | $ 9.99 |
| AV960414 | Avant Mostro Nitro 24T Engine Pulley | $ 16.99 |
| AV960415 | Avant Mostro Nitro 25T Engine Pulley | $ 16.99 |
| AV960416 | Avant Mostro Nitro 26T Engine Pulley (Kit Default ) | $ 16.99 |
| AV960417 | Avant Mostro Nitro Clutch Stack Nut | $ 8.99 |
| AV960418 | Avant Mostro Nitro Starter Shaft Bearing Block | $ 15.99 |
| AV960419 | Avant Mostro Nitro Clutch Stack Sliding Plate | $ 38.99 |
| AV960420 | Avant Mostro Nitro Aluminum Landing Skids | $ 14.99 |
| AV960421 | Avant Mostro Nitro Aluminum Landing Skids | $ 14.99 |
| AV960430 | Avant Mostro Fuel Tank Assembly | $ 22.99 |
| AV960431 | Avant Mostro Nitro Fuel Tank Hardware | $ 16.99 |
| AV960432 | Avant Mostro Fuel Tank Rubber Strip | $ 12.99 |
| AV960440 | Avant Mostro Aluminum CNC Machined Fan | $ 44.99 |
| AV960441 | Avant Mostro Nitro Motor Mounts | $ 35.99 |
| Mostro/Aurora common Parts | ||
| AV000110 | Avant CCPM Anti-rotation guide Pin | $ 5.99 |
| AV000121 | Avant Hex Starter Adapter | $ 12.99 |
| AV000123 | Avant Steel balls M2 (5) | $ 8.99 |
| AV000124 | Avant Steel balls M3 (5) | $ 9.99 |
| AV000126 | Avant Standard Ball Link (10) | $ 9.99 |
| AV000127 | Avant Ball Link Thick Thread (4) | $ 4.99 |
| AV000128 | Avant Canopy grommets | $ 5.99 |
| AV000133 | Avant Tail Y-link | $ 4.99 |
| AV000135 | Avant Washout Y-Link | $ 4.99 |
| AV000136 | Avant 6mm Starter Shaft | $ 9.99 |
| AV000138 | Avant Black UV-rated Cable ties | $ 4.99 |
| AV000140 | Avant Mostro and Aurora Follower Arms with bearings, Y-Links and pins | $ 24.99 |
| AV900214 | Avant Aluminum Landing Skids | $ 12.99 |
| AV900229 | Avant Tail Slider threaded Brass Sleeve | $ 7.99 |
| AV900242 | Avant Tail Output Shaft | $ 12.99 |
| AV900245 | Avant Tail Hub | $ 14.99 |
| AV910309 | Avant Cooling Fan ( Kit Default ) | $ 12.99 |
| AV910311 | Avant Fan Shroud Set | $ 17.99 |
| AV910314 | Avant Fan Hub Threaded 5/16-24 (OS) | $ 19.99 |
We’re happy to announce that the Mostro e700 is shipping worldwide. People all over the world are receiving their Mostro kits and posting pictures and videos on Facebook, YouTube and online forums and the response has been overwhelmingly positive. We are very happy that all our work paid off with the result in the best helicopter kit in the market by far. Hope you enjoy your new Mostro helicopter as much as we do ourselves.
Regards,
Avant RC.
Update on the release of the Mostro kits.
As posted elsewhere we have been waiting for a few parts we shipped out to third party vendors that needed processing to be completed. We received most of them back and there’s only a few left that we’re waiting for because of delays who our suppliers blamed mostly due on the holidays.
In the meantime we kept testing the units and we found that after the last change of adding the double one-way bearing we created a situation in a part that had previously had perfect performance but due to the new design wear showed up and had to be recently corrected.
As you can seen in the pictures below the new parts we announced for the double one-way included what we call a conical pulley because it’s shaped as a cone.
This conical pulley is the one that drives the tail pulley. In the part we announced we kept the original bolt pattern using one through bolt and nut. The initial testing showed excellent performance but recently we noticed that play had developed in the shaft contact area because the original single bolt and nut design doesn’t offer support for a new torsional strain created by the new conical shape.
We discovered that when the bolt was parallel to the boom and when the tail blade rotor is under load the force from the tail blades under load would not move the conical pulley but when the bolt was perpendicular to the boom line then the conical pulley would not have a locking fastener preventing the rotation of the top of the conical pulley towards the tail. This very minute rotation with enough flights generated a very small play by slightly deforming the shape of the pulley shaft contact area into a slightly oval shape. Even though it’s not something that can be seen in plain sight when you measure the diameter across and perpendicular to the bolt with precise instruments there are very slight differences of diameter of a couple of thousands of an inch that indicate the in time it could become a problem. Even though for a customer the problem would take hundreds of flights to appear we decided we can’t sell a product with a known wear issue so we corrected the problem by using four screws that offer support and prevent play at any point of the rotation of the conical pulley. The new conical pulley and new shaft have been in production for a few days. We decided that in order to make the kits available faster we will not wait to have them all ready but instead we will start shipping kits as soon as those two new parts are being finished once we receive back the remaining parts being processed by third parties. The kits will be shipped in the strict order in which they were ordered.
If you were smart enough to pre-order your kits you will be receiving kits soon. Same with Dealers that placed orders ahead their customers will receive kits sooner than dealers or customers who placed orders later but then again a strict first-come first-served policy will be used.
Keep in mind that we don’t know the exact date that we will start shipping kits but based on the current information we’re expecting that around the beginning of February there should be a good number of kits shipped as we normalize production and will continue to ship as a regular product.
