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Twist and Turn Electric Retract with 3mm Landing Gear Leg (2pc) 29.0g
The easiest way to put retracts in your plane. No need to install a control box, messy wiring or a complicated air system. Just screw in the retracts, connect to your Rx and youre ready! Reliable servo mechanism with metal gearing and a high torque motor ensures trouble free flying, this unit is a Twist and Turn type making them ideal for models like the F4-U Corsair,
P-40 and so on.
Why bother with air systems when you can now have a realistic and reliable electric unit at a fraction of the price?!
There are several options you can use to mount a wheel. There are a few axles you can look for that will attach to it OR you can simply and carefully bend the end to 90 degrees and use a collar to keep the wheel in place. I usually just bend them carefully, put the wheel on followed by the collar.
First of all thanks for your reply, but I need some more help. In this case I can not bend the leg because I need a 85mm leg and (if I have well understood) this is just 86mm, bending the leg I can lose 20-30mm having the plane to close to ground. So the only solution will be to find an axle. But frankly speaking I am not able to find it. Do you know if HK is selling any light and cheap axle good for this retract?
i m building a balsa spitfire and i have OR011-01701 on it you can see the video on the tab that page.these are twist and turn retracts they are for mostly corsair kind not suitable for spitfire. you should go for HK-15094M or if its heavier than 1.2 or 1.3 kg HKD-312 this could be better.
Can someone confirm if the trunnion has a metal pin through it. (the part that shears off on plastic trunnions taking all the load)as trunnions on these look plastic.
Also looking at dimensions these look similar to durafly corsair (1100mm) retracts, and I suspect you can use them if you still have the wheel and leg (which has the facory fitted pin)
Did anybody use this retracts in a airfield/FMS Mini P-40? I'm thinking about this oportunity but have some doubt that the retracts are too heavy?
If one unit is 29g the additional weight to the warbird is 58g!!!Maybe too much....?
That is 58g with out the axels or wheels the main strut is not long enough to bend to fit you wheels. These would be to big and heavy for the mini p-40.
I have them in the Hobbyking (artech) corsair and they are great but that is about as small as you'd want to go as they are relatively heavy units - I bent a small portion of the leg 90 deg and used brass tube for the axles.
Sorry for my late reply....
How much weight did the retracts add to your corsair by benting the leg and not using stop collars? And what's the weight of your corsair without the retracts. Maybe I can compare it with my P-40...
As I bent the leg it added about 50 g as I removed the original legs and mounting - remove a large chunk of foam and add some carbon reinforcement and a plywood strip to screw into
Too bad :-( I think also 50g is too much for my little P-40. But I want to have retracts. Maybe some "non scale" plastic retracts without twist and turn will do the job...
Hmm you wouldn't save much from these as you will still need to add a mount for the units add a servo and the rods to actuate, servo rods and the strengthening of the areas where the foam has been removed to fit the wheels - you would be lucky to do all that for less than 40g
Maybe you're right. For 13$ I'll give it a try. It's going to be a winter project. If the P-40 will be too heavy I can remove the retracts and use it in another warbird like a corsair...Thx for your support!Oh and is it this corsair you wrote about? (Produkt ID: AT-F4U)
Yep that's the one - flys really well - not fast but plenty of power - almost like a trainer - no vices and looks great with the wheels tucked up and whilst retracting.
This is a 3mm shaft so a small set with a 3 or 4mm hole with grub srcew fasteners will do but keep them small as these retracts are not strong and will only suit a small scale plane up to 1200mm wingspan.
You would have to check the leg length as the plastic of the retract mechanism sticks down a long way on these to give support - the leg you mention will fit well and I guess you could trim the plastic but you would be weakening things.
Yep the actuater is identical but the final output leg and base is different so as long as those parts survive the 18.8gram units would make excellent spares
If the top of the strut can recieve a 3mm rod with grub screw type fastner, i suppose you could make it work. these are designed for a for a dierect axel attachment which HK do not sell.
These retracts rely on the pin which is factory fitted to the shaft and the plastic housing for support so you couldn't use other legs unfortunately but they are perfect for the small models if they can take the weight. I have fitted a set to a Hobbyking f4u corsair (3s 1300 battery) and they are great.
How does the twist/rotate function work? Is it an integrated gear in the units or a simple twist-link attached on the underside? Twist-links get knocked off too easy IMHO. Thanks!
There is a steel pin 90 degrees to the main strut and as the gear begins to lower the pin hits the casing of the unit and turns. This pin has come away for a couple of people in the discussion when taking off and landing causing the wheel to turn and nose down. you also need axels for these which HK dont sell. The main strut is very short so no room to bend them.
The above answer is absolutely correct and should be credited - the leg is inside the plastic that hangs down - the wire appears soft and was easily bent - wish it was longer so could use it for more models - I bent the last 10mm over and used brass tube for the axle
I would say 29 grams each as the total weight is 72 grams and arrived in a zip lock bag, My scales is not working so can not check for you, sorry i couldn't be more help
These look to be a great unit - just wish the legs were 1 to 2 inches (25-50mm) longer as they currently can't be bent to attach the wheel and 86mm is shorter than most legs so you need to somehow join more wire on the bottom.
The leg is drilled with a pin through it which is the heart of the system - to replace would be difficult - it would be better if hobbyking just spent the extra few cents on more wire
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