HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Apr 05, 2006, 05:30 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Discussion
Could an RG15 foil work for a plank?

Just curious...

I have an extra set of 60" span RG15 cut EPP cores, in a fairly wide, 9" root x6" tip chord. Could these work as a plank? Would it handle horrible?

The design I'm pondering is actually a 3 control surface plank type deal but I think it would be still considered a plank right?

Thanks!!!!

Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Sign up now
to remove ads between posts
Old Apr 05, 2006, 05:34 PM
Crikey never leave beer behind
steve wenban's Avatar
Mt Annan Sydney Australia
Joined Dec 2003
23,325 Posts
yeah it would work but you have to put relfex into the elevons they are not that impressive though , but they do work
SteveW
Been there done that bought the tee shirt
steve wenban is offline Find More Posts by steve wenban
Reply With Quote
Old Apr 05, 2006, 06:34 PM
Can you spot the giraffe?
daleksw's Avatar
Glasgow, Scotland
Joined Jun 2005
832 Posts
Don,

SteveW is correct, it would fly, but you'd have to reflex the elevons somewhat.

It's worth pointing out though that RG15 with elevons reflexed a few degress up isn't RG15 any more. It's something else and expecting performance similar to that of RG15 is optimistic to say the least.

Best thing you can do to any plank is give it a fuselage so you can run your RG15 wing as an RG15 wing and use a tailplane to control pitch instead of messing up a perfectly good wing section.

David
daleksw is offline Find More Posts by daleksw
Reply With Quote
Old Apr 05, 2006, 06:42 PM
Boar? I'm a Thermal Pig!
Batmanwpg's Avatar
Winnipeg, Canada
Joined Aug 2004
914 Posts
The problem is the airfoil must be reflexed almost all the time in order to fly. This puts the RG-15 airfoil out of its low drag range so you are constantly flying at higher drag values. You are better off to design your wing with an airfoil designed for this purpose i.e. reflexed TE type airfoil that has low drag even with the TE reflexed. Airfoils such as MH-45 fill this requirement yet have very low drag.
Batmanwpg is offline Find More Posts by Batmanwpg
Reply With Quote
Old Apr 05, 2006, 08:27 PM
Registered User
SchiessCo's Avatar
North Hills
Joined Nov 1999
6,073 Posts
We should hopefully know soon.

http://www.rcgroups.com/forums/showthread.php?t=500244

Pete
SchiessCo is offline Find More Posts by SchiessCo
Reply With Quote
Old Apr 05, 2006, 08:52 PM
Confirmed Chronic
screamin' eagle's Avatar
Pacific Palisades, CA
Joined Jul 2004
9,224 Posts
Quote:
Originally Posted by SchiessCo
We should hopefully know soon.

http://www.rcgroups.com/forums/showthread.php?t=500244

Pete
Yup, maidened it today. Flies and flies well (enough). Set a new PB DSing it as well. Full report in another thread.

http://www.rcgroups.com/forums/forumdisplay.php?f=97
screamin' eagle is offline Find More Posts by screamin' eagle
Last edited by screamin' eagle; Apr 05, 2006 at 09:03 PM.
Reply With Quote
Old Apr 05, 2006, 09:57 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Quote:
Originally Posted by screamin' eagle
Yup, maidened it today. Flies and flies well (enough). Set a new PB DSing it as well. Full report in another thread.

http://www.rcgroups.com/forums/forumdisplay.php?f=97
Haaaaaaaa sweeeeeeeeeeeet!!!

crazy you were out maidening something "similar" to what I was brainstorming..

Good to know it flies and congrats on the maiden!!!

I think that if I make it 3 control surface, but still plank-ish, I might be able to still run the slight camber in the ailerons.. dang I don't know...


Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Apr 05, 2006, 10:17 PM
Feeling FrSky
surfimp's Avatar
United States, CA, Santa Barbara
Joined Feb 2003
20,086 Posts
I've heard of a number of planks using the RG15 with reflexed elevons and getting very satisfying performance. Like the above, I wasn't expecting much, but it actually turned out to be pretty good. Doing some searches on here would probably turn up more info, it wasn't all that long ago this was being discussed and experimented on (with planks).

Steve
surfimp is offline Find More Posts by surfimp
RCG Plus Member
Old Apr 05, 2006, 10:33 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Thanks Steve good to know..

I searched a bit but "rg15" and "plank" didn't turn up too much in the titles together.. If the elevator portion is about 20" long I'd think it shoud have some good authority. Just gotta try it I guess..

Don
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Apr 05, 2006, 10:36 PM
Feeling FrSky
surfimp's Avatar
United States, CA, Santa Barbara
Joined Feb 2003
20,086 Posts
Definitely make sure to setup the mixing so you can do fullspan elevator, I suspect you may end up liking it better than central elevator alone. In my experience, anyways...

Steve
surfimp is offline Find More Posts by surfimp
RCG Plus Member
Old Apr 05, 2006, 10:38 PM
blah...
THUREN's Avatar
United States, OR, Bend
Joined Jun 2005
2,932 Posts
Quote:
Originally Posted by surfimp
Definitely make sure to setup the mixing so you can do fullspan elevator, I suspect you may end up liking it better than central elevator alone. In my experience, anyways...

Steve
With the "dub"?
THUREN is offline Find More Posts by THUREN
Reply With Quote
Old Apr 05, 2006, 10:44 PM
Feeling FrSky
surfimp's Avatar
United States, CA, Santa Barbara
Joined Feb 2003
20,086 Posts
Quote:
Originally Posted by THUREN
With the "dub"?
Oui. See the May 05 issue of RCSD for more details:

http://www.rcsoaringdigest.com/pdfs/...SD-2005-05.pdf

Steve
surfimp is offline Find More Posts by surfimp
RCG Plus Member
Old Apr 05, 2006, 10:45 PM
Confirmed Chronic
screamin' eagle's Avatar
Pacific Palisades, CA
Joined Jul 2004
9,224 Posts
Quote:
Originally Posted by THUREN
Haaaaaaaa sweeeeeeeeeeeet!!!

crazy you were out maidening something "similar" to what I was brainstorming..

Good to know it flies and congrats on the maiden!!!

I think that if I make it 3 control surface, but still plank-ish, I might be able to still run the slight camber in the ailerons.. dang I don't know...


Don
What's crazier is that my original idea was to do something similar to what you thought about - a short coupled tail. I messed with it for a while and decided I needed to get the stab up high to get out of the wing wash. At that point it would have required a fairly complicated elevator assembly, so the plan became to make a simple plank instead.
screamin' eagle is offline Find More Posts by screamin' eagle
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
suggestions for a foil for a plank ? epkoncept Flying Wings 18 Jul 07, 2006 07:29 AM
Could this work for this price? The Enemy Aerial Photography 13 May 06, 2005 05:27 AM
Would this work for an actuator? StrangeDejaVu Scratchbuilt Indoor and Micro Models 6 Oct 12, 2004 11:24 AM
Will this motorbattery combo work for replacing an ISPD? oex Parkflyers 1 Mar 16, 2003 11:51 PM
Modifying an Old Balsa Trainer for Electric (Tyro Too) ballardb Electric Plane Talk 3 Sep 11, 2001 07:13 AM