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Old Jul 16, 2012, 05:20 PM
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Thanks for the plans, Looks interesting and cheap, i might have to build one. Would a DX5e work and instead of carbon rods, can i use 12' bamboo skewers. Would this motor work

http://www.ebay.ca/itm/130728245242?...84.m1423.l2649

or this one

http://www.ebay.ca/itm/180908249532?...84.m1423.l2649

with this esc

http://www.ebay.ca/itm/10A-10-Brushl...item3365e32213

i have a few 9g servos, that i hope i can use.
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Old Jul 16, 2012, 06:11 PM
The Sweet Aroma of 92 Octane
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United States, PA, Downingtown
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Originally Posted by balsa or carbon View Post
The DTD is not high wing and has no dihedral so it is not self righting , but if you keep it light it should be able to fly slow enough to keep under control . Start with the CG slightly forward , and move it back ( a LITTLE at a time ) if needed .
I would suggest low rates to begin with , and if possible have someone experienced trim it for you on that first flight ( start with both elevons SLIGHTLY up , with the right elevon SLIGHTLY higher than the left elevon ) .
There is no rudder , so it's " bank and yank " . To make a turn you initiate a bank with ailerons , then yank on the elevator to complete the turn .
If you have already built the paper airplane airframe , try that one first - it will be easier to fly than the DTD , especially if you put some dihedral in the wings .
Okay thank you. What would you say is good for low rates? Oh and the paper airplane one...well i didn't put any dihedral into it. I didn't know how to keep it up.... But if you tell me how to add dihedral, i can redo it. Also, are you sure that this power system is enough for the paper airplane? Its the one i was going to use for the DTD:

Dynam Combo that you linked me to

11.1v 800mah 20c lipo

8x6 slo fly prop
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Last edited by electricrc68; Jul 16, 2012 at 06:32 PM.
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Old Jul 16, 2012, 06:35 PM
Hot glue held together by foam
United States, WA, Vancouver
Joined Aug 2010
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Quote:
Originally Posted by terminator1234 View Post
Thanks for the plans, Looks interesting and cheap, i might have to build one. Would a DX5e work and instead of carbon rods, can i use 12' bamboo skewers. Would this motor work

http://www.ebay.ca/itm/130728245242?...84.m1423.l2649

or this one

http://www.ebay.ca/itm/180908249532?...84.m1423.l2649

with this esc

http://www.ebay.ca/itm/10A-10-Brushl...item3365e32213

i have a few 9g servos, that i hope i can use.
That 80 watt motor might work if you build light . Yes , it takes a 10 amp ESC .
Bamboo skewers will be fine . Dx5e will also work , you would have to set up delta mixing .
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Old Jul 16, 2012, 07:15 PM
Hot glue held together by foam
United States, WA, Vancouver
Joined Aug 2010
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Originally Posted by electricrc68 View Post
Okay thank you. What would you say is good for low rates? Oh and the paper airplane one...well i didn't put any dihedral into it. I didn't know how to keep it up.... But if you tell me how to add dihedral, i can redo it. Also, are you sure that this power system is enough for the paper airplane? Its the one i was going to use for the DTD:

Dynam Combo that you linked me to

11.1v 800mah 20c lipo

8x6 slo fly prop
I would definitely add dihedral to the paper airplane one . You can probably cut the wings off ( with a NEW , SHARP blade ) about a 1/4 " from where they are glued together , and then re-glue them back together with dihedral .
The way I do it is : lay one wing flat on some wax paper ( on a flat table or work bench ) , then put hot glue on the first 3-4" starting at the nose . Press the other wing up against it while holding it up at an angle to the first one , keep holding it that way until the glue sets . Put more hot glue ( 3-4" again ) on the flat wing ( on the wax paper ) by the prop slot , then press the other wing up against it while holding it up at the same angle . After that glue sets , put more hot glue ( 3-4" again ) on the flat wing ( on the wax paper ) by the tail end , press the tail end of the other wing against that while holding it up at the same angle as before . After that glue sets , run a bead of glue along the entire joint , top and bottom .
The greater that angle the more dihedral you'll have - and the more self righting you'll have . BUT , too much dihedral and your wings will lose lift .
That motor combo should fly the paper airplane OK if you keep it light , and it will probably be a little overpowered for the DTD . Oh well , you'll have unlimited vertical .
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Old Jul 16, 2012, 07:31 PM
The Sweet Aroma of 92 Octane
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Thanks. I have two more foam boards so im going to just restart...besides, I messed up the prop slot pretty bad. One problem....I don't have wax paper. Any other way you can think of? If not, I will try and think up a way. Also, how would you say i will be able to keep the plane light? Like what exactly should I do to keep it light?
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Old Jul 16, 2012, 09:15 PM
The Sweet Aroma of 92 Octane
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Hmm, you know what, Im just going to build the delta. So what would you say is good for low rates?
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Old Jul 16, 2012, 10:33 PM
Hot glue held together by foam
United States, WA, Vancouver
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Originally Posted by electricrc68 View Post
Hmm, you know what, Im just going to build the delta. So what would you say is good for low rates?
Maybe 60 % low rates and 20% expo
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Old Jul 16, 2012, 10:41 PM
Hot glue held together by foam
United States, WA, Vancouver
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Originally Posted by electricrc68 View Post
Thanks. I have two more foam boards so im going to just restart...besides, I messed up the prop slot pretty bad. One problem....I don't have wax paper. Any other way you can think of? If not, I will try and think up a way. Also, how would you say i will be able to keep the plane light? Like what exactly should I do to keep it light?
Aluminum foil might work instead of wax paper - you mainly don't want to glue it to your table .
To keep a plane light use only as much glue/tape/re-enforcement rods etc. as is necessary for the airframe , and use the smallest battery that will give your motor enough power and give the plane the correct CG .
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Old Jul 16, 2012, 10:49 PM
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Okay cool thanks.
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Old Jul 20, 2012, 09:21 PM
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United States, CA, Santa Clara
Joined Feb 2006
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No dihedral and no airfoil. Amazing. I went to Dollar Tree and bought foam ater reading this thread. I plan to fly my first attempt tomorrow. I will try it with flat wings "as is" then add some dihedral and see what differences it makes. I am going high powered with the inrunner off a Stryker-C.
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Old Jul 21, 2012, 06:04 PM
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Originally Posted by j beede View Post
No dihedral and no airfoil. Amazing. I went to Dollar Tree and bought foam ater reading this thread. I plan to fly my first attempt tomorrow. I will try it with flat wings "as is" then add some dihedral and see what differences it makes. I am going high powered with the inrunner off a Stryker-C.
It does have a KF airfoil on top of the wing - not sure how much difference it makes . I'd be curious to know how it flies with more dihedral , if you could let me know .
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Old Jul 22, 2012, 09:14 PM
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Flew my first DTD build today. Actually the first RC plane I have ever built from scratch. No air foil, no dihedral. The plane has 30" wingspan (of course) and I set the CG about 8" behind the point where the leading edges would intersect. It hand launched nicely under full power and flew better than I expected. With no air foil it required steady back pressure on the stick. Very steady during straight and level flying--that surprised me. I had to take it easy on the throttle as my 40 amp ESC hasn't arrived yet. I ran a 7x5 prop, 3S, 20C battery. It measures 410W on the bench WOT. That's about double the recommeded continuous power per the datasheet for my SA Sport 2212-6 outrunner. Too much fun! I am going to cut the wings off and add some dihedral.
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Old Jul 22, 2012, 09:17 PM
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I was going to use the inrunner 400 motor off my Stryker... but $20 for the SA SPort 2212-6 outrunner from my LHS was such a good deal that I decided not to risk the Parkzone ($$$) motor on my prototype flyer.
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Old Jul 23, 2012, 12:29 AM
Hot glue held together by foam
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Originally Posted by j beede View Post
Flew my first DTD build today. Actually the first RC plane I have ever built from scratch. No air foil, no dihedral. The plane has 30" wingspan (of course) and I set the CG about 8" behind the point where the leading edges would intersect. It hand launched nicely under full power and flew better than I expected. With no air foil it required steady back pressure on the stick. Very steady during straight and level flying--that surprised me. I had to take it easy on the throttle as my 40 amp ESC hasn't arrived yet. I ran a 7x5 prop, 3S, 20C battery. It measures 410W on the bench WOT. That's about double the recommeded continuous power per the datasheet for my SA Sport 2212-6 outrunner. Too much fun! I am going to cut the wings off and add some dihedral.
I'm glad your DTD flew well ! That steady back pressure on the stick ( reflex ) you mentioned is needed on deltas to keep the nose slightly up so it can "plane" on the air , much like the tips on water skiis need to be slightly up to "plane" on the water . It's best just to trim a little up elevator before you start .
Any photos/videos ?
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Old Jul 27, 2012, 12:12 AM
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I cut the wings off my DTD and reattached them with about 7 dihedral. It was dark when I finished so we will see what adding some dihedral does tomorrow.
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