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Jan 24, 2020, 03:44 PM
scratchbuilder
Thomas B.'s Avatar
Thread OP
Build Log

The Trotteldecker - super simple aerobatic and 3D biplane free plan


Great fun to fly, quick and easy to build: the Trotteldecker. 60cm Span, 2-3s 450 -600mAh lipo, 20- 30g outrunner.
Downloadplanmodell Trotteldecker aus FlugModell 03/2020 (2 min 26 sec)


Here is the plan:
https://www.flugmodell-magazin.de/download/29827/
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Jan 24, 2020, 10:16 PM
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r/cdawg's Avatar
Looks like a blast to fly. Well done Thomas!
Jan 29, 2020, 04:15 AM
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davereap's Avatar
Thank you thomas.. to make things a bit faster here is the info from the video..
plans..
A quick description is at https://www.flugmodell-magazin.de/do...trotteldecker/

But it seems like you have to pay for a subscription to get the full article...thats a shame, a proper online build log would be nice..
Never mind here are the stills from the video.. these should be enough for most builders
Last edited by davereap; Jan 29, 2020 at 04:45 AM.
Jan 29, 2020, 01:55 PM
scratchbuilder
Thomas B.'s Avatar
Thread OP
Yes, I intended to post build pics here -now you started it, thank you.
Jan 30, 2020, 04:14 AM
Registered User
davereap's Avatar
It all takes time, being retired I have plenty...

more pics and info would be good..

I included the sketchup file for those that prefer to measure from dimensions and cut, rather than print out the full plan..
Jan 30, 2020, 12:17 PM
scratchbuilder
Thomas B.'s Avatar
Thread OP
Thanks Dave!

So, some basic information:

The Trotteldecker is the biplane version of my super simple Trottel wing on box model. And as I always was a fan of the Panic which is the ultimate simple aerobatic bipe, I borrowed the tail setup and the idea to put the wing struts at wingtips.
The Trotteldecker is small, 60cm span, under 300g of weight. Powerde by a 20 g motor with 1700kV and a 450mAh 3s Lipo.
Construction is all 6mm Depron, no wing spars or other reinforcement.
Wings are KFm4 with a quite sharp leading edge and blunt trailing edge.

You can fly it as an aileron trainer/sports model on 2s with moderate control throws - or as a small extreme aerobatic monster with 3D capabilities on 3s with large throws.
Jan 30, 2020, 12:59 PM
scratchbuilder
Thomas B.'s Avatar
Thread OP

Fly anywhere


The Trotteldecker is suited for all kinds of limited flying spaces.

Trotteldecker im Skatepark (0 min 45 sec)
Feb 01, 2020, 04:05 AM
Registered User
davereap's Avatar
where did you put your hatches..
Feb 02, 2020, 03:23 AM
scratchbuilder
Thomas B.'s Avatar
Thread OP
At fuselage bottom between firewall and wing. On the plan it is named Akkuklappe.
Feb 02, 2020, 04:02 PM
Registered User
davereap's Avatar
Ive been working on a sketchup file.. for a KFm2 version made from 7-8mm EPP , made tough for my indoor flying.. trying for the same basic shape but with a slightly different construction for strength

parts all from 7-8mm epp...note the rudder is wrong here
Last edited by davereap; Feb 04, 2020 at 12:07 PM.
Feb 03, 2020, 05:01 PM
Registered User
Very nice Thomas!

I will have to build one some time - looking forward to watching other build and fly theirs!
Feb 05, 2020, 12:14 AM
Registered User
davereap's Avatar
As usual I made mistakes..lol...
1st... I used the top deck shape for the central spline, so the model I have made is a lot fatter ..
2nd... I used all 8mm EPP so the wings are thicker by 3mm or so.. ..note they are still thinner than a KFm4 from 6mm
3rd.. my fin and rudder are not correct to plan..
4th.. my fuz ended up out of square, instant glue got stuck fast slightly off the line.

however ...for my site its fine, it is a strong build, about 1oz overweight at 128g empty
Last edited by davereap; Feb 06, 2020 at 12:10 PM.
Feb 05, 2020, 02:57 PM
scratchbuilder
Thomas B.'s Avatar
Thread OP
Some Moonlight flying with a new aerobatic manoeuvre I call the Brake Loop.
Trotteldecker im Mondlicht (0 min 54 sec)
Feb 07, 2020, 04:16 AM
Registered User
davereap's Avatar
The fatter KFm2 version is flying nicely.. It still requires a better COG and thrust angle..
.
2s flight
24 inch kfm2 trottel biplane from 8mm EPP...TRIMMING (5 min 10 sec)

.
3s flight
24 inch kfm2 trottel biplane from 8mm EPP 3S 450 (5 min 3 sec)


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