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Take off dolly for a Funfighter, anyone used one?

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martin collins 113/08/2019 15:14:57
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368 forum posts
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I am putting together a Cambrian Funfighter at the mo and have been told the torque of the high performance electric motor makes them torque to the left on launch. As i will mostly be launching it myself i am considering the use of a take off dolly, one of the manufacturers does a laser cut kit for one, has anyone used one of these and if so how successful are they?

Alan Gorham_13/08/2019 15:41:39
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1245 forum posts
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Underarm launch at 2/3 power works really well.

SIMON CRAGG13/08/2019 16:13:27
561 forum posts
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Get a mate to give it a good chuck for you first time out. Once trimmed, you should be fine. Nose down a bit a full beans. Piece of cake!.

Stuphedd13/08/2019 17:42:47
700 forum posts
369 photos

P51 Cambria fun fighter from a catapult !! cannot rotate the photo ??img20190813_17275639.jpg

martin collins 113/08/2019 19:05:32
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368 forum posts
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Looks like a good way to launch, bit of a setup though!

Don Fry13/08/2019 19:14:56
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4557 forum posts
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I used to do these as combat aircraft. Lived near to the original factory.

We used a 5 to 6 foot length of broken dinghy mast, on a bi-pod. Two sail slides, and a light box to hold the aircraft, some catipult elastic, and they went like a scalded cat.

Frank Skilbeck13/08/2019 19:31:32
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4681 forum posts
101 photos

I knocked together a tail dragger dolly for a Cloud models typhoon (with OS32), it worked well, but club mate with a Me109 funfighter didn't have much joy with it, mainly because my typhoon had a rudder and the Me109 didn't.

alex nicol13/08/2019 20:19:52
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359 forum posts
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I used to have the Mustang many moons ago, grossly over powered with a 32 (can't remember if it was SC or APS) What I do remember was take offs were as hairy as hell unless it got a right good fast heave into the air.

That said once I'd realised why, take offs were no problem.

As mentioned I think you could have problems with the dolly if you had no rudder

Alex

dan h13/08/2019 21:15:15
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114 forum posts
36 photos

Hi martin.

What funfighter are you building. Have you chose a setup?

I am going to order one myself this week. Im going with the cambrian hurricane ( electric ). I have a turnigy 3536 1450kv to use in mine with a 9"or 10" prop not sure if to go 3 or 4 cell at the moment all depends on cg.

Dan

Stuart Z13/08/2019 21:15:41
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390 forum posts

Hi

If you put together the kit version dolly, you can have a radio controlled steering. I made one up and used the vacant rudder channel on the tax and a second rx. Not used it yet but the steering works on the dolly, just need to get the lot to a flying field.

S

martin collins 113/08/2019 21:41:23
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368 forum posts
175 photos

I`m building a Cambrian ME 109, build thread will be started tomorrow with full spec etc. Once done i am going to do a Cambria KI61 Hein. I already have a Cambria Spitfire uo and ready to fly which someone else built, it is on 4s and a Sunnysky X2814 35MM 1250 kv motor on an 8x8 prop, it should go like the clappers on that set up. I also have a very old Cambrian P51 which i am converting to electric as we speak.......

Stuphedd13/08/2019 21:56:11
700 forum posts
369 photos

The catapult set up was complicated , It was originally made by the guy who wanted the opportunity to fly on his own .

But it took about 3 of us to carry it all out to the field , ( it had built in wheels !!)( an engineering masterpiece)

The must unnerving thing was the release was foot operated , sounds easy !! But you want to try flying and balancing on one leg , not as easy as it sounds !

But that shot was of its maiden launch , a success!

cheers

dan h13/08/2019 22:04:58
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114 forum posts
36 photos
Posted by martin collins 1 on 13/08/2019 21:41:23:

I`m building a Cambrian ME 109, build thread will be started tomorrow with full spec etc. Once done i am going to do a Cambria KI61 Hein. I already have a Cambria Spitfire uo and ready to fly which someone else built, it is on 4s and a Sunnysky X2814 35MM 1250 kv motor on an 8x8 prop, it should go like the clappers on that set up. I also have a very old Cambrian P51 which i am converting to electric as we speak.......

thanks martin. i will look forward to seeing and reading your build thread as im sure it will help me with my build,

cheers

dan

martin collins 113/08/2019 22:22:34
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368 forum posts
175 photos

001.jpg

Chris Walby14/08/2019 06:02:07
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1198 forum posts
299 photos

I had an ME108 electric, with very fierce take off roll.

Best hand launched (under arm) with the throttle at 2/3 and the throttle cut employed. So model in left hand, thumb on right stick (elevator /aileron, mode 2) and finger on throttle cut switch. Advance throttle, flick switch and WAIT

Wait 2 or 3 seconds until the motor has stopped accelerating...then with a little swinging action and the wings at 30degrees roll to the right let go!

Did try a dolly (kit version with steering servo) but I am on Spektrum with model match so I have to keep rebinding between models (bit of a faff) and without the rudder (do fit a controlled rudder to the model) the massive P effect makes it very hard to launch + you are really low to the ground so easy to touch a wing tip and spin in...

Bungee if you have to, but that's a faff as well...so hand launch it is normally easiest,,, and into wind makes a difference even on low wind days!

Hope that helps

martin collins 114/08/2019 10:11:34
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368 forum posts
175 photos

Hmmm, left hand launch, hadn`t considered that but obviously gives you full stick control from release. I have an old GWS ME109 which i picked up off a mate which has a brushless 3s set up in it, this also torques to the left on launch. I will experiment left hand launches with that, also a couple of clicks of up elevator, to help stop any dip when first released. Thanks for that!

Alan Gorham_14/08/2019 10:18:41
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1245 forum posts
144 photos

Martin: both Chris and I have advocated underarm launching. This is the factor that will save you. Because you are throwing the model away from you underarm it will go away from you nose up, then tend to describe a parabola as gravity takes effect so "dipping" from the launch is not an issue.

As I previously suggested, using 2/3 throttle reduces the torque effect as well.

You will find you have time to get on the sticks and climb away.

I've launched three funfighter type models this way on many many successful flights and I'd much rather do this than faff on with a dolly or catapult.

Edited By Alan Gorham_ on 14/08/2019 10:19:03

martin collins 114/08/2019 10:32:02
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368 forum posts
175 photos

Thanks Alan, i have done that with the GWS 109 and made 2 out of 4 successful launches, the other 2 were perilously close to ground contact by the time my right hand was back in control, a combination of the plane dipping and banking left despite a right hand canted launch..........

I will try it with a few clicks of up elevator next time to hopefully avoid the dip which may sort it. It is finding what works for me.

Alan Gorham_14/08/2019 10:41:21
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1245 forum posts
144 photos

You don't need up trim (which actually puts the aircraft closer to a stall situation surely??) if you launch the model nose up. That was my understanding of the advantage of the underarm launch - you push the model up into the air.

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