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Old Jan 31, 2013, 11:38 AM
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Dickeroo's Avatar
Joined Dec 2006
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Quote:
Originally Posted by rusty case View Post
Great vid, Dick!
Excellent pilot!
Gotta build me one of those!
is that the fpv49 scratchbuilt plan?
Yes, that is a FPV49 V3 KFm4 flying wing designed originally by Schraut5 and refined by Trond.

Here are the plans.

http://m.youtube.com/#/watch?feature=plcp&v=7d5QCwWgnAg
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Old Jan 31, 2013, 01:57 PM
scratchbuilder
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Germany, Nordrhein-Westfalen, Cologne
Joined Mar 2012
682 Posts
Excellent videos!
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Old Feb 03, 2013, 02:40 PM
scratchbuilder
Thomas B.'s Avatar
Germany, Nordrhein-Westfalen, Cologne
Joined Mar 2012
682 Posts
Bugatti 100

This is my latest build, a Bugatti 100. The original was intended to break the speed record in the 30`s but was never flown because of the war.
Model is 60cm span, Kfm 4 airfoil, 207 g, Turnigy 2211/2300 with Graupner 4,7x4,7 prop and 800 mah 3s lipo.
Maiden flight in heavy winds went surprisingly well. Looks great in the air.
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Old Feb 03, 2013, 02:50 PM
What could possibly go wrong?
nickchud's Avatar
Market Harborough
Joined Apr 2006
3,804 Posts
Fabulous Thomas - one of my favorite planes.

Shouldn't it be blue?
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Old Feb 03, 2013, 03:33 PM
scratchbuilder
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Germany, Nordrhein-Westfalen, Cologne
Joined Mar 2012
682 Posts
You are right, Nick - it should be blue, but it is small and quite fast so I thought red would be easier to keep in sight. Now the Bugatti looks like a Ferrari.
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Old Feb 03, 2013, 11:16 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
1,961 Posts
Thomas B:

Your Bugatti 100 ist Prima!

Dave-
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Old Feb 04, 2013, 02:15 AM
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Ashford. Kent. England
Joined Feb 2005
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An elegant shape made into a pretty model... nice one Thomas
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Old Feb 04, 2013, 11:36 AM
Registered User
United States, MS, Gulfport
Joined Jan 2013
19 Posts
flying KFm2 on windy day

rc plane scratchbuilt foamie windy conditions Gulfport Mississippi (8 min 16 sec)

Here is a youtube link to me flying in heavy wind with my foamie. It looks to get good lift, but the thing drops out of the sky in a glide. I'm not sure why.
handmade plane flying and crashing in the sand at the gulfport harbor. gusts around 25 mph I guess.

Dollar tree foamboard
bamboo skewers
hot glue
30" wingspan
KFM airfoil
24" I think length
no rod in wing
no rudder
2 9g servos
2 cell lipo nanotech 1.0
8-9 min flight time
exeed rocket 2205-1600kv
9x5 plactic prop
total weight a/b 300grams
flysky tx rx
20a ESC
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Old Feb 04, 2013, 02:13 PM
KlonWarz
Joined Dec 2012
455 Posts
perhaps it's a CG problem, adam???
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Old Feb 04, 2013, 05:23 PM
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NorCal
Joined Dec 2009
1,716 Posts
Looks like a CG thing. Do a dive test on a less windy day.
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Old Feb 04, 2013, 07:54 PM
Registered User
United States, MS, Gulfport
Joined Jan 2013
19 Posts
CG problem

Where should the CG be? I think mine is right at the drop of the step. should it be different?
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Old Feb 04, 2013, 08:07 PM
CV-15 VB-16
giuseppi's Avatar
USA, TX, Friendswood
Joined Jul 2007
1,386 Posts
Quote:
Originally Posted by adamh1281 View Post
Where should the CG be? I think mine is right at the drop of the step. should it be different?
Typically, the CG should be approximately 1/3 of the average chord from the leading edge.

g
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Old Feb 04, 2013, 08:40 PM
Build straight - Fly twisty
Whiskers's Avatar
Australia, QLD, Little Mountain
Joined Feb 2010
4,414 Posts
adamh Most of the problems I saw with your flight were due to flying a plane that is unsuitable for the conditions.
Get up early and fly in the early-morning calm and you'll get a real handle on how you plane behaves.
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Old Feb 04, 2013, 08:58 PM
Jack
USA, ME, Ellsworth
Joined May 2008
17,222 Posts
Quote:
Originally Posted by adamh1281 View Post
Where should the CG be? I think mine is right at the drop of the step. should it be different?
The dive test is the best way to find the best CG point. The page at the link below is intended more for gliders and recommends doing the test with the plane trimmed for a level glide. But if you reduce power to just enough to maintain level flight (and trim for level flight as you do the test), the reactions of the plane and the results will be the same.

For me, the indication that I do not have the CG at the right point is that (on a calm day ideally) if I trim for a level glide or level flight and land I'll find there is some amount of up or down trim on the elevator. That is an indications that you are holding a too heavy tail up (down trim) or keeping the tail down (up trim) on a nose heavy plane.

The point of the article is that you find the neutral CG point and set the CG to suit the way you like to fly. Some planes and flying venues favor CG locations that will intentionally vary from the tail heavy side to the nose heavy side.

Once you understand the article the image explains it all.

CG location article - http://www.polecataero.com/handlaunchu/cg-location

CG location image - http://polecataero.com/uploads/cg_trim.pdf

Jack
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Old Feb 04, 2013, 09:07 PM
Registered User
United States, MS, Gulfport
Joined Jan 2013
19 Posts
Quote:
Originally Posted by Whiskers View Post
adamh Most of the problems I saw with your flight were due to flying a plane that is unsuitable for the conditions.
Get up early and fly in the early-morning calm and you'll get a real handle on how you plane behaves.
Yes. I know. I wanted a challenge. I've been flying for about a month, and I've gotten bored with it. I wanted to fly yesterday, and I enjoyed the challenge. crashes are OK, just means I learn something and get to build another plane, or fix the one I've got.
thank you all for the advice.
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