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Old Sep 15, 2011, 05:26 PM
gpw
“There’s no place like Foam”
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OK !!! I see now !!! Thanks !!!
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Old Sep 19, 2011, 01:20 AM
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I decided to make the third size a lightweight and also try out the more accurate ufo/cap/NB cross with perfect semicircular tips and the folded center

This one is a simpler KFm2 all from 3mm depron, It has just under 2sqft of area.

AUW with 350 3 cell...5.125oz ...wing loading 2.6ozsqft...
AUW with 500 3 cell...5.875oz...wing loading 3ozsqft
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Last edited by davereap; Sep 19, 2011 at 04:38 AM.
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Old Sep 19, 2011, 08:48 PM
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Kinda reminds me of the Opus of a few years back...

http://www.rcgroups.com/forums/showt...highlight=opus
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Old Sep 20, 2011, 06:41 AM
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The W wing has been used on a lot of planes as has the gull wing which is the inverted version..

just wish the wind would calm down enough to fly... The small one is ready to go, all set on the radio and it has more than enough power to go vertical..

Ive used an emax 1806/25 motor.. 18gms .. with a 7x4 prop and a 20C 500 3 cell..
3x 3.7gm servos.. corona 4ch 2.4rec.. 12A esc.. the motor is rated to <10A
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Old Sep 20, 2011, 09:58 AM
What could possibly go wrong?
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Brilliant design Dave!

I know it's good 'cos it makes me say to myself, "why didn't I think of that?"

Subscribed. I'm keen to see the floats version...

Cheers

nick
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Old Sep 20, 2011, 10:06 AM
gpw
“There’s no place like Foam”
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What’s up with you guys and Floats ????
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Old Sep 20, 2011, 02:51 PM
What could possibly go wrong?
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Floats? Have a look at this W wing..
Dewey Eldred 'Flyer's Dream' light seaplane (1 min 12 sec)
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Old Sep 20, 2011, 10:44 PM
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That one looks a little scary to me. I just think how rough a seadoo can be in choppy water at 50-65. I can't imagine trying to land that thing in rough water at 50mph. Very neat video though. someone should make an rc version if it hasn't been done.
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Old Sep 20, 2011, 10:47 PM
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Dave, I am not familiar with that motor. Do you like it? 3s huh?
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Old Sep 21, 2011, 05:46 AM
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The emax range of motor have been fine for me..
The little one is giving 8oz thrust so is good for a 5 oz model..
http://robotbirds.com/catalog/produc...oducts_id=4115
I am not keen on the prop saver front, I much prefer a full prop adapter

floats.. should be an easy fit.. just need to make sure the prop clears the surface you fly off.. Would be good off sand , snow , water.. I have some floats so I will be fitting them before our winter weather sets in..
Thats another job...For water and snow use I would also need to move the gear to the top of the wing..

Ive just started the CF and fabric Night kite version.. That is to be a folding kite to fit flat in a suit case.. for next years holiday..
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Old Sep 21, 2011, 07:57 AM
What could possibly go wrong?
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Dave:
Quote:
Would be good off sand , snow , water..
That's right, there's loads of fun to be had scooting around on the ground, or landing and taking off from ponds, the beach or from rough fields.

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Old Sep 22, 2011, 06:14 AM
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Ive just maidened the small "W" wing with a KFm2 section..

What can I say other than its "C***" and I will be probably be scrapping it...still evaluating for now..

.
Its difficult to understand how a small change to the tip shape can make such a vast difference to how it flys...
It was not stable, the two previous heart shaped wings were beautiful and easy ..very stable..
It was highly responsive, but being small and fast I expected that..
I prattle on about the COG, but the two previous bigger versions were flown from nose heavy to tail very heavy and it didnt bother them at all..
SO WHY??????
.
W wing with semicircular tips KFm2 (3 min 36 sec)
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Last edited by davereap; Sep 23, 2011 at 06:58 AM.
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Old Sep 22, 2011, 06:41 AM
gpw
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Just an observation , the elevons on the semi-circular plane seem to be more swept forward than the Heart shape ... if that makes any difference .... might ???
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Old Sep 23, 2011, 06:43 AM
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GPW ...it just improves the roll..try raked forward on your UFO, you will find it rolls even faster.. the 45 angle rolls the small model like mad
The biger models are more sedate in any case they are angled at 30

EDIT2..... I was correct its the COG, plus thrust angles ..
I moved the COG to exactly 25% by putting the battery on top and having it right up the front.. This got the COG to the neutral spot, not a safe position like 25% is on a Nutball..
Doing the COG dive test it didn't pull out and it didn't steepen...so next Ive got to get it safer, move it forward a bit..

Thrust lines I didn't use a tube mount thinking the weight would be a problem, so now I found Ive too much down and too much left. It climbs with a left turn under power then glides with a right turn.. I really should have used the tube as I need more front weight in any case..
Its flying better but still overall poorer than the Nutballs.. its lacking the stability.. mind you it does roll a treat and it can be flown fast and wild.. but thats not how I like em...
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Old Sep 24, 2011, 04:08 PM
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The small one is better ballanced and trimmed.. but it is still lacking in overall stability..
I am thinking of adding the lower step to make it a KFm4 , perhaps that will improve the stability..
The heart shaped ones are so much easier, although their roll rate is slower

KF airfoils get an airing (10 min 12 sec)
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