vertical grimmace

My Feedback: (1)

I have heard the Cheetahs are tricky to launch without a snap. Look up the Sunracer. That is a killer little plane.

Mr Cox

Yes, the low wing is not very pleasant to hand-launch, a little finger grip might help, or a "girly throw" as we call them (under arm throw?). Another great looking one is the Voodoo, then you get a high-wing design of about the same wing area, but I guess they've stopped making them.

forsakenrider

Toads crew used to race 200square inch planes on Norvels. The nooner is only 180 squars to I figured it was reasonable. At 125 square inches my big mig powered Q125 plane is super fast but its all square and probably not super efficient. I was thinking the molded nooner should still be pretty fast at 180sq inches and an even faster engine.

You guys disagree? this the wings too big?

Ive also got a molded Sipso style fuse with a super thin 130 square inch wing, that could be another option. Or build another Q500 style fuse with the foam core 130 wing....

SO many decisions....

combatpigg

My Feedback: (3)

Any wing area that you don't need is wasted drag. Any airfoil thickness you dont need for basic structural strength is wasted drag. Anything that you see in the head on view that sticks out past the sillouette of the engine is wasted drag. The penalties for slight aerodynamic flaws really stand out with these tiny engines and tiny props.

120 sq inches and 10-11 ozs

150 sq inches and 13-14 ozs........are 2 basic size and weight ranges I've had good results for building all balsa planes for .049-.061 powered speed planes.

RocketRob

My Feedback: (1)

The Nooner is a decent plane - no world beater and a bit thick airfoil but solid plane.
We were flying them with Mega 3turns on 10cell nimh getting 130mph

DeviousDave

Careful,.... You can go too small with wing area and airfoil thickness. When you have too little of either, the airplane needs to fly at a higher incident angle to get enough lift so the induced drag ends up being as bad or worse than the drag you were trying to avoid in the first place.

IMO, the magic numbers for a 1/2A racer/speed plane are 110-130 sq. in., 8-8.5oz target weight, and a stock thickness airfoil like the MH30 or RG14.

combatpigg

My Feedback: (3)

My first SWRs they were field tested and those sessions included removing wing area [at the field] until I reached the point of seeing no improvement or negative results.

As far as airfoils are concerned, if there are any high speed airfoils that have been researched on planes that fly at this size and level of power...I'd like to see real world results measured in flat out speed to see what the difference is.

As it stands, the SWR "belt sander airfoil" runs right at the mathematical pitch speed that the doppler readings show for in flight rpm.

skaliwag

My Feedback: (1)

Yes of course. The CP0202 (2/2%) Airfoil

combatpigg

My Feedback: (3)

36/80/150/220 airfoil...?......

forsakenrider

Well I think I will still put it on the Nooner to begin with. I know it would be a record breaker. Once that gets boring I'll put a bigger engine in the nooner and build a smaller racer for the Profi.

How do you this my Nooner will be with the Profi?

combatpigg

My Feedback: (3)

It should be fun and pretty fast.

The differences in speed from one plane to another are only important if you are racing other planes or if you are involved with measuring your speed and make it your hobby to go faster.

DeviousDave

Didn't mean to be a measurebator, just wanted to point out that there is a limit-we saw a lot of this in Sp400 electric pylon racing, they got down as small as 75sq. in. and still weighed 11-12oz. Sure, those smaller planes were fast but eventually you gotta yank on the elevator....

airraptor

My Feedback: (66)

The nooner and that engine you will be no more than 98-100mph.
put in one of those smaller 98-108 Sq " racers and keep under 10 ounces and will be close to 130mph.

If you are going to fly it on the nooner then just bolt on to the front dont cut the fuselage up to cowl it in and all. you will regret it later. this way still can go electri in it later.

I have done three of these electric to glow set ups. I didnt have a profi or fora but can get 28,500-30,000 on 4.2x4 props on the norvel type engines.
The TT .07 with some modding can spin a APC electric 5x5 at 25,000.

Still most of these planes never went over 115-117mph.

combatpigg

My Feedback: (3)

Looking back a few years when I was running GWS receivers, 110 mah packs, HS-55 servos in the first SWRs, the lightest were around 8.5-9 ozs with a Cox product engine...but even at 105 sq inches of wing the planes didn't glide or fly that well.
The extra 20 sq inches made a big difference....which is about the wing area of the Guillows P-51 that I made patterns from then built a simple sheet built plane instead of stick built.

The other consideration that I'll never forget after reading about it is reynolds numbers for the weight that most of these racers end up being make using wings with less than 4 inches of chord not a great idea in the .049 and up planes.

Mr Cox

Ok, I'll bite...
What did your engine guru do to the TT .07 then, made it a .12?

coriolan

The TT .07 with some modding can spin a APC electric 5x5 at 25,000.

What did you do to it?

airraptor

My Feedback: (66)

all the normal stuff crank timing, open carb, lower compression, raised and widened exhaust port. raised transfer by a hair, opened up ports in case some. cleaned crank so is free to run in case.

Max_Power

Wow, sounds like you threw the book at it! All this with a standard glow plug and muffler? Cmon...stop teasing us and show some vids or data with different props and fuels,etc...I actually did most of this plus a nelson head to a TT07 this week and youre making me anxious to run it Todd

airraptor

My Feedback: (66)

No muffler. will work on getting some videos later this week. going flying now.