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Old Apr 06, 2009, 07:50 AM
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kdahlhaus's Avatar
United States, OH, Westlake
Joined Mar 2002
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Bass, great to hear that. Thanks for posting the results. Dick's KF wing just works wonders on these planes.
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Old Apr 06, 2009, 02:51 PM
Crash and Burn
Butler, Indiana
Joined Nov 2008
145 Posts
Kdahlhaus,The kmf4 is something that is left to experianced pilots.Definitly not for training also I felt the vortex trap would work better on a larger model.The me-109 is fast the way it is and has excellent control.On the me-109 it was better without the vortex trap being small it is a darty little plane it seemed to make the alieron controls jerky and faster that make it hard to keep up with. Also need power to land would stall out without power.
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Old Apr 07, 2009, 03:36 AM
Crash and Burn
Butler, Indiana
Joined Nov 2008
145 Posts
On a kf wing it calls (example) out for 50%of chord at 9% what happens if the fold is less than 50% of chord. What effect will it have on a model if any? Will it change the center of gravity? Or will it not create the proper lift that it is required? Anyone explain this to me. Trying to understand th kf wing better and the best place to use it.
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Old Apr 09, 2009, 06:01 PM
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Australia, QLD, Buderim
Joined Dec 2008
52 Posts
Quote:
Originally Posted by kdahlhaus
With some help from Gene, I modified his Blu-51cd P-51 to create a ME-109. It flies great, which is no surprise as the control surface size and location is pretty much identical to that of the Blu-51.

It's an easy build - I left the skin on, rounded the leading edges and tempered the wings with a heat gun. There's a single skewer bracing the wing. Ailerons and elevator are taped on with a single layer of packing tape. Hot glue for everything except the control horns. The horizontal stabilizer is one piece. I attached one of the elevators, glued the stabilizer in place, then attached the other elevator and glued a *bucks coffee stirrer across the elevators ( you want to remove the blue-skin where the stirrer contacts the foam ).

All build information on the Blu-51 ( http://www.rcgroups.com/forums/showt...ghlight=blu+51 ) applies to this plane as well.

Edit:

newbie125 posted a great video of his blu-109. His 109 starts 1:16 into the video.

jonesymj posted some video in post #61 of this thread.

there's also a short video in the Airplanes - electric videos forum.
Awsome plane I Had to build one Just gotta add servos and give it a test
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Old Apr 10, 2009, 05:17 AM
Crash and Burn
Butler, Indiana
Joined Nov 2008
145 Posts
Gerry E, Kdahlhaus has a very good plane that flys well above the expectations of most.It is rather fast and responsive.After you maiden you may want to have the alierons alittle above flush to help keep nose up and trim the elevator down to help with glide these are the adjusments I made but these are my preferences.Besure to post pics good luck on your maiden, may your flights be as sucessful as mine.
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Old Apr 10, 2009, 09:03 AM
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Ipoh, Perak Malaysia
Joined Jul 2006
3,980 Posts
Bass, if you have both ailerons up, then they are essentially air-brakes/spoilers. This will slow the plane down and make it drop faster also. If you add in down elevator, it will on make the situation worse. Why would you think such a condition would help you with the glide, unless you want the plane to nose down faster?

chewy
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Old Apr 10, 2009, 08:02 PM
Crash and Burn
Butler, Indiana
Joined Nov 2008
145 Posts
chewytm, It did help the plane it was less than 1/8" had a nose down condition two out of three I build did this didn't slow it down use alieron up alittle to keep nose up used elevator to fine tune.When raising aileron,is like flaps helped keep nose up no room to move battery back.
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Old Apr 11, 2009, 01:22 AM
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Ipoh, Perak Malaysia
Joined Jul 2006
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bass, raising the ailerons would press the nose down, not raise it up. You should tray that instead, but not too much all you may find that the plane will tip-stall easily.

chewy
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Old Apr 11, 2009, 03:32 AM
Crash and Burn
Butler, Indiana
Joined Nov 2008
145 Posts
Chewy, Was having nose up problem battery all the way forward it helped my situation.Without any major sacrifice.This is what Gene Bond had to do with the blue P51,With cg in front of the alierons air on the back of wing will force nose up,only a little above 4\40 wing trailing edge,disadvantage if you go too far it can cause instability and force the plane down.I use the elevator to trim in level flight.
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Old Apr 11, 2009, 04:32 AM
Crash and Burn
Butler, Indiana
Joined Nov 2008
145 Posts
Chewy, Here on this thread is an explanation http://www.rcgroups.com/forums/showt...=389720&page=2
Post 23 and 24 are the explanation of design.Nobody explains it better than Gene can.
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Old Jun 14, 2009, 07:04 PM
evan.flatt
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USA, TN, Portland
Joined Apr 2008
296 Posts
Where is the CG on this plane? I just built one and it seems tail heavy, also what size battery did you use and what is the RTF weight?
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Old Jun 15, 2009, 08:28 AM
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kdahlhaus's Avatar
United States, OH, Westlake
Joined Mar 2002
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I'd start w/the CG at the spar. Never weighed mine, but I'd guess around 7 3/4-8oz or so AUW. I ran mine with a 900 mAh 3-cell lipo, blue-wonder (both from lazertoyz), and a 8060 gws hd prop.

Hope that helps. Post a pic if you have one, would love to see your build.
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Old Jun 15, 2009, 10:15 AM
evan.flatt
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USA, TN, Portland
Joined Apr 2008
296 Posts
I am going to use a rimfire 300 brushless with a 8x3.8 apc prop, e-flite 10 amp pro brushless esc, e-flite 6.5g aileron servo and I will have a 5g elevator servo. Without motor the weight is 7.5 oz, I don't know if the 2 cell willhave the umph to fly the plane when the motor is on it, it should weigh about 9 oz with motor, prop, prop saver etc. The plane has foam board with paper left on. Will it fly?
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Old Jun 15, 2009, 12:29 PM
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United States, OH, Westlake
Joined Mar 2002
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Looks good! I'm not an expert on these calculations, but I'm pretty sure she'll fly just fine at 9 oz.
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Old Jun 15, 2009, 12:58 PM
evan.flatt
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USA, TN, Portland
Joined Apr 2008
296 Posts
Quote:
Originally Posted by kdahlhaus
Looks good! I'm not an expert on these calculations, but I'm pretty sure she'll fly just fine at 9 oz.
Great, it feels good to have an outside opinion. Thanks
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