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Old Jun 18, 2012, 10:28 AM
chuck-e-Jeez
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The Netherlands, GE, Zutphen
Joined Mar 2012
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It already has a spar :-D, but it could do with an airfoil. 5mm depron does flex with this wingspan
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Old Jun 18, 2012, 12:31 PM
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hondarider98's Avatar
Canada
Joined Jul 2010
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I used elmers foam board for my f-22 and the wings feel super strong. They don't bend at all. Should I add one just to keep moisture from warping them?
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Old Jun 18, 2012, 12:51 PM
Pusher jets rule!
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Mesa, AZ
Joined Jan 2006
17,241 Posts
Do you mean add a spar, or add a KF airfoil?

If spar, I always recommend adding a spar, not matter how stiff the foam feels. You be surprised at the amount of stress you can put on this airframe.

If KF, I say it doesn't need it. Some guys say it flies better, I say it flies just fine without.



Pat
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Old Jun 18, 2012, 12:52 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
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Oh, and next time you use Elmers, I suggest soaking the paper and removing it. Because as you say, if it gets wet it may warp.

Pat
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Old Jun 18, 2012, 02:56 PM
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Switzerland
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I went out today without wind it was so boring...
I am using a emax 2805 2840kv with a 4.75x4.75 and 3s. I should have a good speed with this config
The plane is only 80% scale but I think the prop is too small and it is hide by the profil of the plane
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Old Jun 18, 2012, 03:06 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
17,241 Posts
The profile shouldn't be "hiding" the prop, even on the smaller size. The one in my avatar is about 65% of this one, and I use a GWS 4.5x3 prop and it works just fine.

Are you sure the prop is on correctly (front of the prop facing the front of the plane)?

Pat
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Old Jun 18, 2012, 03:16 PM
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Switzerland
Joined Sep 2008
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Yes checked the video. It was done with a old battery
F22 depron... (2 min 48 sec)


I need maybe another prop with less pitch to get more trust

I just check with drive calculator
With the APC 4.75x4.75 I have 380gr 140km/h and 19A
With the GWS 5x4.3 I have 653gr 140km/h and only 16A
3A less for 300gr trust more...nice
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Last edited by Cid156; Jun 18, 2012 at 03:25 PM.
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Old Jun 19, 2012, 03:47 PM
chuck-e-Jeez
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The Netherlands, GE, Zutphen
Joined Mar 2012
41 Posts
Pat,

I've got your motor (the suppo 2212-06 2200 kv) in the FF-117. Goes fantastic on a 2200mah 3S! Motor temp is 50 Celcius, and battery about 37. Forgot to measure the ESC, but was handwarm on all flights
On a 6x4 APC prop it does 115 km/h, yet more than 10 minutes of flying time.

I couldn't be happier!

Video (if that's okay in the F-22 thread...)
Taking the FF-117 parkjet for a spin. (3 min 1 sec)
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Last edited by Jeez; Jun 19, 2012 at 03:48 PM. Reason: added video
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Old Jun 19, 2012, 05:01 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
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Man that thing is fast!

Pat
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Old Jun 19, 2012, 06:10 PM
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United States, SC, Greer
Joined May 2006
606 Posts
Yep, I tried the no spar version. Everything was great and after about 10-12 hard flights the wing totally gave pulling out of a 5G dive. Got a total of 10-12 flights on that one, I would always use something to keep wing flex under control!

Also Vids of foam F117s are always ok!
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Old Jun 19, 2012, 10:22 PM
Slow Flyer
Bombay's Avatar
Richmond, TX
Joined Apr 2008
3,236 Posts
Quote:
Originally Posted by Jeez View Post
Pat,

I've got your motor (the suppo 2212-06 2200 kv) in the FF-117. Goes fantastic on a 2200mah 3S! Motor temp is 50 Celcius, and battery about 37. Forgot to measure the ESC, but was handwarm on all flights
On a 6x4 APC prop it does 115 km/h, yet more than 10 minutes of flying time.
Nice. Where are the plans or build thread for the 117? I feel the need.
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Old Jun 19, 2012, 10:33 PM
A 4's forever
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United States, IL, Marion
Joined Jun 2011
309 Posts
Go to rcfoamfighters.com for the plans.
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Old Jun 20, 2012, 08:39 AM
Slow Flyer
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Richmond, TX
Joined Apr 2008
3,236 Posts
Quote:
Originally Posted by wildwillie63 View Post
Go to rcfoamfighters.com for the plans.
Thanks! Many great looking plans/planes.
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Old Jun 24, 2012, 04:06 PM
Registered User
Switzerland
Joined Sep 2008
950 Posts
So I try the gws5x4.3. I do not see a difference but the esc has cut two times.
I will check the amp draws with the apc4.75x4.75 and the gws 5x4.3

F22 depron with a Emax2805 on 3S and GWS5x4.3 (2 min 40 sec)
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Old Jun 24, 2012, 10:32 PM
Gravity Sucks
Somewhere in the Nations Capital
Joined Sep 2007
51 Posts
Hi Cid156,
I've not used the emax motor, but isn't it a 2S motor? Check the picture below - you might be using too many V's and pulling too many A's for this motor....

2S and 12-14 A (<60 sec) recommended. Not sure on the reliability of those specs though, so if you have a better source of info for the motor maybe follow that, but just a thought!

Cheers,
ResQ
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