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Old Feb 10, 2008, 02:28 PM
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Yellow Aircraft Stingray 90 or 120 mm EDF

Well just bought stingray from RC jets unlimited. Now its time to consider which power system I want to install. Ran some numbers thru fancalc for both
90 mm and 120 mm EDF. Also, verified some of the figures from a search in rc groups (Whisting Watts) had posted alot of good info thanks. Well here are some figures.
TF 4000 BAT Static PWR SYS WT
Neu 1912 1Y 10S = 10.84 Lbs wt = 4.26 Lbs amps = 70 Speed = 259Km/h

1521 1.5 Y 8S = 10.56 Lbs wt = 3.96 Lbs amps = 86.6 Speed = 257Km/h = 160 mph

1527 1.5 Y 10S = 11.27 Lbs wt = 4.84 Lbs amps = 75 Speed = 265Km/h = 165mph

AP 120mm

Mega Ac 22/50/2E 10S = 11.4 Lbs wt = 4.37 Lbs amps = 75 speed = 265 km/h = 165 mph

DS51

1515 2Y 90mm EDF 12S = 8.9 Lbs wt = 4.84 Lbs amps = 59 speed = 311Km/h

1515 1.5Y 90 mm EDF 9S = 8.8 Lbs wt = 3.96 Lbs amps = 80 speed = 310Km/h = 192 mph

1515 3D 10S = 9.9 lbs Wt = 4.18 Lbs amps = 75 speed = 315Km/h

I fly from a grass field with a pretty short run. Any thoughts on which one may be optimal?
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Old Feb 10, 2008, 02:46 PM
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Why stop at 90 and 120mm?

There are now a couple of 110mm fans available, Stumax and DS75, either of which could be a better match for this size of the model.

Gordon
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Old Feb 10, 2008, 03:05 PM
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Old Feb 10, 2008, 06:01 PM
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just to help you in your quest for data, having done 2 of these now I can say for sure that min AUW in any 90mm format will be 10.5 pounds minimum, and 120 will be 12.5 pounds minimum.

Barry
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Old Feb 10, 2008, 06:30 PM
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Well I would have bought tams version but wanted to ponder different power systems. At the moment its 5 degrees obove zero and lots of snow on the ground, so lots of time to build and spend money. Since it is our duty to stimulate the US economy was thinking of buying USA made stuff. Got to spend that tax rebate. The only exception being the fan and maybe bats.

AP 120mm
Mega Ac 22/50/2E 10S = 11.4 Lbs wt = 4.37 Lbs amps = 75 speed = 265 km/h = 165 mph
DS51
1515 2Y 90mm EDF 12S = 8.9 Lbs wt = 4.84 Lbs amps = 59 speed = 311Km/h

Its seems to me this may end up lighter than the 90mm version and a little slower? Mega made in USA I think.
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Old Feb 10, 2008, 07:48 PM
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well thats the great thing about this airframe, its pretty wide open as a test bed. on mine im setup for 10s no rudder's and AUW is just under 11, the jolly rogers one is also no rudders 12s and is just over 11 pounds. and both have very lightweight landing gear, so thats about as light as one is probably gonna get. And check out the vid, 90mm or not it takes off! I still think its the epitome of the 90mm plane, but again its also a perfect test bed and you should, above all, have fun with it and do what you like. But in my book with cost not being the factor and weight not being a factor, I have found both installed 90mm highpower, and 120mm 10s setups, a washout. And thats on good quality fans, the others it starts to tilt even more. we really need a fan right between both, so I fully understand why Stu went the direction he did.
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Old Feb 10, 2008, 09:13 PM
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Yes, I think it would work out well with either 90 or 120mm fans. This would be my first 120mm EDF if go that route. I have a few 90mm builds and twin 70mm EDF`s but This may be my first 120mm. The video of Tam`s version was great and figured out this plane was best suited for my flying conditions.
Light wing loading needed for quick take off. Just wish the flying clubs up here would pave a runway. The closest club with a paved field is 90 minutes freeway away. Thats a long drive for a 7 min flight. In a few weeks things should start coming together. I think this will be a popular EDF conversion and lots of guys here will prob. due it differently. Thanks to you guys who had the wisdom to resurect this model.

Sean
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Old Feb 10, 2008, 10:54 PM
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actually, Mega is from Europe.
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Old Feb 10, 2008, 11:03 PM
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thats right! there chek I think. And i love mega's, but from what i've seen the 120 motor isnt really up to snuff for actual 120 use.

Barry
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Old Feb 10, 2008, 11:17 PM
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Quote:
Originally Posted by monkamarm2000
thats right! there chek I think. And i love mega's, but from what i've seen the 120 motor isnt really up to snuff for actual 120 use.

Barry
Oh, and I thought that the Mega was called that for being good for 120mph, not 120mm fans

Mike
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Old Feb 10, 2008, 11:38 PM
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hehe both! lol

Barry
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Old Feb 11, 2008, 06:09 AM
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sounds like the old HW730 fan would be a nice match
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Old Feb 11, 2008, 09:46 AM
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I noticed the TamJet version of the Stingray and then stumbled upon this thread. Just wondering if the Tam version is as shown on their site ... meaning it comes finished with the Jolly Roger scheme.

I am really keen on perhaps a blank unit so I can do my own colour scheme, is the Yellow one a lot of work to build? Thanks!
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Old Feb 11, 2008, 11:25 AM
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No, I believe it comes as a kit but with a Tams nacelle for 90mm EDF. You will have to put it together and paint.
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Old Feb 11, 2008, 11:27 AM
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no its a kit as it comes from yellow. and its not too bad as far as yellow kits go, but there is some work yes. And yeah Ken, 730 would fly it, its an ideal test bed. But 90mm is the perfect match for this thing. keeps weight low and has gobs of thrust. bascially shows a 10s-12s ds 90mm is really the swap out for typical IC 5 inch counter part. Most just go 120, but for me in my book, 120 is for much bigger heavier planes than this. 90mm is light and you get all that velocity to haul. and besides naccelle is already setup for 90mm drop in and already has proper thrust angle and everything built into it.

Barry
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