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Aug 07, 2020, 11:37 AM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
Build Log

Piper (Cub) On the Rocks - Now With Plan


Hi there,

Some times ago i had the idea to design a plane that :

- Would be very easy and fast to build
- Could fly slow enough to be used indoor but that also could be used "outdoor" in winds up to 20 Km/h.
- Could be gentle enough to be used as a beginner plane for the new membres of my Rc club that would like to learn to pilot "indoor"
- Could be used as an aerobatic / 3D flight capable plane by the advanced pilots

The plane is mainly built from 3 and 6 mm depron.
Some pieces are made from 3mm Vector Board i had in my stock.

That is how was born this little "Piper Cub like" foamie.


Plane's Specs :

Wing Span : 90cm
Length : 75 cm
Wing loading is : 12.3 gr /dm˛
All up weight is : 245 gr

Engine : 2205 1400Kv
Propeller : GWS 8x4.3 sf
ESC : 12A
Lipo : 2S or 3S 450mAh 30c


Here is the video of the maiden flight - powered with a 2S lipo 450mAh 30c

Piper on the Rocks (1 min 29 sec)



The plan A0 format is available here :
http://c3aeroconcept.free.fr/RcGroup/Piper/pipercub.pdf
Last edited by Dreamcatcher; Aug 20, 2020 at 09:56 AM.
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Aug 07, 2020, 12:12 PM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
Some more pictures of the build
Last edited by Dreamcatcher; Aug 11, 2020 at 04:03 PM.
Aug 09, 2020, 10:04 AM
Registered User
rajazo's Avatar
Great Piperish!!! Fly really good. It is amazing you can archive this weight in this plane size.
Aug 11, 2020, 07:02 PM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
Thanks Rajazo !
Aug 11, 2020, 07:03 PM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
Here is a short video of the Piper flying with 3S 450mAh lipo.

Way more power available !!! :-)

Piper (cub) On the r=Rocks - powered with 3s lipo (1 min 10 sec)
Aug 11, 2020, 07:35 PM
Registered User
How close are you to having plans finalized?
Aug 11, 2020, 10:28 PM
Retired CAD guy
birdofplay's Avatar
This would be a nice change_of_pace for guys looking at going towards the upcoming 250g limitation.

I have lots of 6mm and some 3mm too.

I could start cutting these ASAP with your OK !

Let me know if that would be something you'd be interesed in allowing.

best

Bob @ Hoosier Cutout Service.
PS
I just cut out parts I don't load guyS up with lots of extra crap.
Last edited by birdofplay; Aug 12, 2020 at 09:12 PM.
Aug 12, 2020, 05:23 AM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
Quote:
Originally Posted by Nippy62
How close are you to having plans finalized?
I'm Very close
I just have to find time to update them because i simplified some things during the build and now i have to update the plan to match with reallity.
Aug 12, 2020, 11:50 AM
flyin' fool
goldguy's Avatar
You should have the horn/push rod junction directly inline with the hinge. As is you have differential.

Just slant the horn forwards.
Aug 12, 2020, 03:48 PM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
I 100% agree with you, that way to build push rods/control horns / linkaged mecanicaly induce some diffetential because of the position of control horn slightly behind the hinge line but as it's no more than 3 millimeters, it's not important / noticeable - specialy on such a foamie with control throws set to reach +/- 45° on each control surfaces.

The purpose of this way of building the control rods / horns is to have something that cost near nothing, that is efficient, effortless for the servo,reliable in time, as light weight as possible and very fast and easy to build.

In this case it's impossible to slant the horn forward because of the lack of material created by the 45° bevel on the moving part of the control surface - or it would be necessary to cut the 45° bevel on the fixed part of the control surfaces instead of cutting it classically in the moving surfaces.
Last edited by Dreamcatcher; Aug 12, 2020 at 03:58 PM.
Aug 12, 2020, 04:19 PM
Registered User
Would definitely be interested in this. Looks good.
Aug 13, 2020, 05:58 AM
Build, crash...repeat
AleRRon's Avatar
Great modeling skills and really very capable flyer you have there. I always pictured a high wing like this to be pretty sedate, but you’ve made it way more fun and aerobatic. I have to look into this Vector board. Seems harder and stronger than foam?
Aug 13, 2020, 08:50 AM
Registered User
I also wonder what the make up is of vector board and if there is something similar in the U.S.
Aug 13, 2020, 05:46 PM
Warbirds Lover
Dreamcatcher's Avatar
Thread OP
[QUOTE=AleRRon;45208151]I have to look into this Vector board. Seems harder and stronger than foam

Quote:
Originally Posted by Ks.jetflyer
I also wonder what the make up is of vector board and if there is something similar in the U.S.

Here is a video presentation of what is vector board made by Graupner (PVC is depron) :

Vector Boards - Be a creator (4 min 59 sec)


May be Graupner have a reseller in the US ?

Hope this can help

Thanks for your kind words gents !

Tonight i worked 3 hours to apply corrections / modifications to my plan.
I still have some improvements to do on it imho (may be creating a second page that will contain only the parts to cut could makes the work easier for people who want to build one ? - let me know... ).
Last edited by Dreamcatcher; Aug 13, 2020 at 06:15 PM.


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