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Old Nov 26, 2012, 05:54 PM
LuvEvolution7 is offline
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I'd prefer my thrust line above the center line than below it. my preference would be slight back pressure with power than down pressure.
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Old Nov 26, 2012, 11:22 PM
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Okay so the 3 Maiden attempts are not good , but it is still in one piece. The EDF tube had enough power to drive itself around the delta in tight circles, awesome 3D performance but not what I was looking for. I think I am way off in my C of G , I had a friend calculate my wing shape in CAD for 22%, but now I am thinking more like 15% might be better on a high rake delta. Nobody publishes data on these things , and I defaulted to make my EDF tube parallel to the wing.At the end of the throw , it climbed out into a stall and then looped non stop until I powered off.LuvEvolution, many guys gearing up and testing for Ottawa next year, but it will be some sort of scratch build that will take it....
Old Nov 26, 2012, 11:39 PM
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I agree, it'll be a scratchbuilt that'll take it.....................and someone who has the biggest understanding of aerodynamics. not sure that'll be me, but I'm gonna give it my best shot. LOL.

does your delta have a nose/fuselage section, or is is a straight delta wing? if it's a wing, 22% sounds way to far back. it could also be that your thrust line is not in line with the centerline of the fuselage/wing. if one of those two don't jive, you end up with that looping, 3D flight. add to that a CG that's too far back and you combine tail heavy with it. I bet it looked really cool though. LOL.

Rich
Old Nov 27, 2012, 05:26 PM
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I havent looked at the thread in awhile but I have some interest in building another experimental project. Is the speed contest open to all or are you guys designing for a local contest? I designed and built the Vixen XD1 awhile back. It is a delta with a 70mm on 5s, it is fast but I have never GPSed or radared it. I have been thinking of a modified design built specifically for speed. Heres a pic from the build thread.
Old Nov 28, 2012, 08:16 AM
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speed


I whould move fan forward & add thrust tube
Old Dec 01, 2012, 12:46 PM
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this could also be the way to mount the elevator not to close the wing, make it a canard.
found it in the luft46 article

Old Dec 01, 2012, 02:00 PM
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just build delta wing & see how munch power you can punt on it
Old Dec 01, 2012, 05:36 PM
Erik v. Schaik is offline
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Discart the delta wing because the sensitivity at high speeds are close to uncontrolable, even with dual rate, expo,glass hing lines and large surface levers.

Been there in 2006:
https://www.rcgroups.com/forums/showthread.php?t=558138
Old Dec 01, 2012, 07:35 PM
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agreed. Delta's are cool, but they scrub too much darn speed to be in a speed contest. you need more brute power to get back the speed you scrub off. sure, they go like a bat outta hell in a straight line, but you gotta take too much real estate to build up the speed you lost in the turn to get there. small airframe with lots of power will win a speed contest. a DS-style airframe is what will win it.
Old Dec 01, 2012, 10:12 PM
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Whats a DS style airframe?
Old Dec 01, 2012, 10:14 PM
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Lee Liddle
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Dynamic Soaring
Old Dec 01, 2012, 10:19 PM
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I've had good luck with flying wing designs. Not pure deltas but more like blended wing/fuselage designs. With the right airfoil and thrust angle, much of the drag can be reduced.
Old Dec 01, 2012, 10:36 PM
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did you get my PM Lee? what about a wing like that, on a DS style fuse? might be onto something there. LOL.
Old Dec 02, 2012, 03:50 AM
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The 1st Uriah concept (Uriah-B1) was a flying wing based on a design winner contest plane called Tsunami. Links and plans of the Tsunami can be found at post4 of the Uriah-B1 thread:
https://www.rcgroups.com/forums/show....php?t=1056417
Tough the Tsunami should be an exellent flyer with 480BB power, On brushless it showed several issues. I think The original plans may work very well on a 250w setup which is not high speed but still a good pace. i think it can be very close to the 1st gen Nid powered Pyranhas.

Having build 3 lippischP20 and the Uriah-B1 gives me good experience in flying wings. Especially the Uriah-B1 showed loss in height when cornering and low high speed fly bys were hard to control regarding elevator. Because of this I added the stab and relocated the fan.

In the link you can see the modified thrust tube angle on the Uriah-B1. The angle made a handlaunch impossible because eventually it went down due to coupling.
Old Dec 02, 2012, 04:14 AM
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Quote:
Originally Posted by Lt599 View Post
Whats a DS style airframe?
http://airtoimedia.nl/web/upload/Emi...k_8-7-2007.wmv

Makes great sport flyers. The Destiny became my favourite everyday edf jet but the RG15 airfoil is not a high speed critics choice. This is a NIB glass version purshased 2nd hand. I ordered a carbon version a week earlier which has not been in production yet (roumor is 10 months waiting time). Feel free to send me a pm if interested. The carbon versions are priced very sharp!


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