patterndreamer

My Feedback: (1)

What planes would fall under this category? meaning planes that could take it stock with any engine. Just wondering cause i think a .40 size shrike would be a fairly good canidate along with a a Diamond Dust.

patternd

HighPlains

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It takes a good design and enormous power to crack 200 MPH. Say you have an airplane than can fly 125 mph. You would have to quadruple the power to do 200.

Ed Smith

In theoretical terms, simple arithmetic tells us that to achieve 200 mph a 10" pitch prop would have to turn at 21,276 rpm. This is theory only ignoring airplane weight, drag and all of the inefficiences associated with turning propellers. As was indicated it would take some power to turn a 10" pitch prop at that rpm.

If you truly wish to fly at speeds well in excess of 200mph, join the glider guys and go "Dynamic Soaring"

Ed S

Mike Connor

My Feedback: (5)

I have had one Shrike 40 and two DD's with Sport Jett engines. My best speed calculations for level flight was just under 180 mph and that was probably a little optimistic. Some claim 200 mph with this type of plane and I would like to see how they did it.

patterndreamer

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i figured just as much. Considering a prop loses efficency after the tip reach supersonic you could only turn the prop so fast.

patternd

Rudeboy

I don't think a Shrike 40 is going to crack the 200 mark no matter what engine you bolt into it... it is just too fat.

A Dust... Maybe, out of a dive and with some serious (well matched) power.

If you want a 200 mph "stocker", get a Dago Red from Flugapparatebau Wolf ( http://www.f3d.de/ ) with an MB Profi engine or something similar. The plane will do 200 "out of the box", but only if your engine runs right... and that can be tricky... these are not intended for beginners (to say the least). But then again, there aren't too many newbies willing to shell out 2000$ just to show off their skillz...

patterndreamer

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that's the point. Just thinking right now about the expression on the faces of the jets guys when a prop plane is keeping up with them.

patternd

AdrianM

Most of the jet guys don't fly anywhere near 200mph. They dont want their $10K planes getting away from them at a quarter mile per second.

e-sailpilot86

Look at a Dynamic Soaring specific model sailplane. They've got the strength to sustain those kind of speeds, and under extremely high sustained G-forces (40-60 g's continuous). Just throw a really high performance setup on it that'll get a pitch speed of about 200mph. Limiting factor will be the $$$$ you've got, because it will be a four digit figure for the airframe and servos alone.

http://www.nesail.com/categories.php...79eee6b1b9506c
http://www.f3x.com/
http://www.rcgroups.com/forums/forumdisplay.php?f=126
http://www.et-air.com/opus/techstuff.htm
http://www.bretamodel.cz/
http://www.hkm-models.com/Dynamod.htm
http://www.hkm-models.com/
http://www.icare-rc.com/slope.htm
http://www.f3j.cz/english.htm
http://www.mapleleafdesign.com/ (icon will do it, but you'd better have some $$$$$)
http://www.rnrproducts.com/
http://www.f3j.com/
http://www.shredair.com/wwslope.html (DS tempest)
http://www.tun.ch/
http://www.airplane-model.com/
http://www.volz-servos.com/
whew! That's it!

You'll want to use multiple digital servos on these models, a 5 cell setup, failsafe, etc. Best bet is with Volz servos or the finest you can find.

So you know, the planes that are custom bulit for DS are built to withstand 200+ speeds sustained for however long the battery will last, and have bullet proof wings, well, sort of.

HighPlains

My Feedback: (1)

Yeah right, 900 MPH

patterndreamer

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i would say shrike if you thin the wings and have the $$$ to use carbon fiber sheeting on it. But i think a dd if you squeeze a jett .90 onto it.

patternd

e-sailpilot86

Osiris... Mini-blade with .90 jett on it.

AlexF

I had a Sidewinder quarter 40 model with stock jett Q 40 motor and APC 7.4x8 clocked at 201. I had to dive it a bit though.

You have to figure that the q40s and FAI racers are about the only planes that will do it with the recommended engine.. and that's just because the recommended engine is amazing

Mike Connor

My Feedback: (5)

Rudeboy,

Have you ever owned a Shrike 40? While I agree a stock Shrike would have trouble reaching 200 mph I was surprised about how fast it was with a Jett 50. I could not tell the difference in speed between the Shrike and DD just by looking. I think I remember calculating the wing thickness at 12% on the Shrike. However, the WOW factor of the Dust made it my favorite plane.

patterndreamer

My Feedback: (1)

well if the wingthickness was brought down on the shrike say to about 10% i don't know. Would it make a speed difference?

patternd

Mike Connor

My Feedback: (5)

The Dust is about a 5% wing but I probably would not go thinner then 8% or 10% on a shrike. I would also clip a couple of inches off the wing tips, shorten the ailerons and slim down the fuse as it is much larger then necessary to keep all the radio gear inside. I got a lot of compliments on the Shrike on low passes at speeds well over 100 mph. While the Shrike looks really good and is fast, it has few additional qualities that are above average IMO.

patterndreamer

My Feedback: (1)

but if i made those changes what speed increases would we be talking about?

patternd

AlexF

maybe 10 or 15 mph? That's a WAG.

Mike Connor

My Feedback: (5)

If you build it clean and light and put a hot engine on it I would think you should do 180 mph or better. I really hate to make speed claims but my experience says it would be very fast.

patterndreamer

My Feedback: (1)

good to know. Now all i need to do is save up for the carbon fiber and jett 60 fire and tune pipe.

patternd

HighPlains

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A conventional design can be made to go faster, ie., like a Q40 airframe than the delta designs. However, the deltas do offer one huge advantage - they can burn off the speed better at high angles of attack without stalling and thus are much much easier to land than a clean Q40 airframe.

AlexF

Amen. The q40 and to a lesser extent even q500s are really difficult to land because of super flat glide ratios. On the plus side, if your q40 motor dies while you're making a 3 foot high pass, you still have time to circle the field once and land :P

Mike Connor

My Feedback: (5)

I agree one would be hard pressed to modify a Dust or Shrike enough to stay with a Q40 but you must consider the cost of that extra 20+ mph

AlexF

No kidding about the price.

I'd be interested to know how accurately the q40 airfoils have to be built in order to work reasonably well. You would think that you could get reasonably close by using just one airfoil for the whole wing and making all the dimensions the same. You could even build a slightly slimmer fuselage than the q40 rules allow

Mike Connor

My Feedback: (5)

I think you could build it strong enough without carbon fiber and I would consider the new Jett 61LX that also comes in FIRE config. It is a 61 in a 40 case timed for high rpm.