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Sep 07, 2010, 12:55 AM
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Freddie B's Avatar
Looks like it flys well enough, pretty fast too!

Fred
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Sep 07, 2010, 07:39 PM
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Thanks! How would I go around slowing it down? I want it teach some of my friends to fly using it in our gym, but it is too fast for that. Do I need to put on a different prop or add some airfoil? Thanks.
Sep 07, 2010, 08:08 PM
2^p - 1
signflyer's Avatar
Nice looking build! To get slower speeds, some undercamber will help (to the detriment of flying in a breeze). Other than that, more wing area and / or less weight would also slow it down.
Sep 08, 2010, 03:32 AM
Once crash at a time
Bowerz's Avatar
throttle control?
Sep 08, 2010, 05:43 PM
Addicted to building...
Freddie B's Avatar
Agree with signflyer, undercamber will help a lot. By the looks of the video, I think it could handle larger surface areas as well, no problem climbing now!

Good luck

Fred
Sep 09, 2010, 11:30 AM
Registered User
So the under-camber is the airfoil? Sorry for being a newb.
Sep 09, 2010, 11:38 AM
Addicted to building...
Freddie B's Avatar
Quote:
Originally Posted by helidude22
So the under-camber is the airfoil? Sorry for being a newb.
Yes. Search for something like the GWS Slow Stick, or some early WWI Biplanes, or somethig prior to the war, and look at the wings. It creates much drag, but tons of lift. Limits high speed too, but it has everything you are looking for on this design. It also makes the wing much stiffer, and stronger.

An undercamber wing needs a little more incidence, which means about 2-3 degrees more up on the leading edge. On this size plane, maybe that would equate to another 1/8" raised at the leading edge.

Fred
Sep 09, 2010, 11:44 AM
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hauntfreaks's Avatar
this is a wing I built for one of mine Embers... 3mm depron and to create the under camber I used a 1" dowel and rolled it out...

Sep 09, 2010, 06:45 PM
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wrcsti's Avatar
double kf huh?
Sep 09, 2010, 07:27 PM
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hauntfreaks's Avatar
Quote:
Originally Posted by wrcsti
double kf huh?
yep... and seems to work really well....

here is the Link to more photos
Sep 09, 2010, 08:42 PM
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ckreef's Avatar
Here is a ember style wing (with ailerons added). I rolled the foam over a round surface to get the airfoil and then used 4 ribs so it maintains the shape over the long run. I scored the bottom of the wing in the middle and then bent it for a little dihedral.

The rolled foam makes a fairly rigid wing without having to add any carbon fiber.



Last edited by ckreef; Sep 09, 2010 at 08:48 PM.
Sep 14, 2010, 02:55 PM
Registered User

Pitts Special - 35 cm


Im working on it.
Sep 14, 2010, 04:42 PM
Nothing flies like a Pitts
Meshuggah's Avatar
Nice Pitts! What is the WS and weight?
Sep 15, 2010, 01:07 AM
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kylewoody's Avatar
Scratchbuilt F4F Wildcat from 3MM Depron. Very light, flies awesome, neutral stability. All the guts (brick, motor, etc.) are from a Parkzone Sukhoi.



Kyle
Sep 15, 2010, 08:08 AM
Registered User

Dumas 17" Tiger Moth - RET


Ready for maiden flight on Saturday evening - Tuggeranong, Canberra. Once we see how that goes, I may add the stickers/roundels on for a bit more colour.

17" Dumas kit built "stock" (no wood substitutions), covered in Esaki tissue. Wheels from the PZ UM-P51. A true tail-dragger (no tail wheel or skid), but can turn "on a wingtip" once there is a bit of air moving over the rudder.
Vapor green dot brick, rudder-elevator-throttle. BSDMicro 7mm blue motor with 4:1 gearbox. plenty of thrust on a GWS 5x3.
Flying weight 30-32 grams (haven't gotten my good scales out yet)

Whilst admiring the wonderfully light and flexible control horns on the UM P51 and T28 and wondering if you could buy them separately, I stumbled across a sheet of cyano hinge material. light, flexible, easy to cut. Used on the rudder and is much better than the 1/64" ply horn on the elevator.


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