Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Go fast mustang

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Old 10-10-2007, 09:53 PM
  #1  
Erik R
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Default Go fast mustang

All,

I am buying a Top Flite 1/5 mustang,with a ZDZ 80 in it.Looking for input on prop size and manufacturers for max speed.ZDZ recomends 26-10,or 24-10 or 12.I'm thinking a 22-14 will give me better speed,but haven't seen these made by any manufacturer.I have had 3 of these mustangs with G-62's in them,and they flew well,around 100-120.I'm looking for 150+.It should be capable ,as the ZDZ 80 has about twice the power of a G-62.Just need to prop it right.Thanks in advance,

Erik
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Old 10-11-2007, 11:05 PM
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rmenke
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Default RE: Go fast mustang

ERICR:

Don't think you will have a hp problem, what you need t look at most is getting rpm's with the HP. Suggest you go to the giant warbird racing thread and get into this aspect with the guys that are throwing large dollars at engine hop-ups. A lot of the engines I have seen were converted to glow just to get rid of the related ignition problems. The guys at RC Showcase may also have some help. Problem with speed is the first 100-120 is easy, to scoot higher is $$$$$$$ related, believe me. Its worth the cost to get to one of their races just to hear the engins. The unlimiteds are well over 200mph, the average cost well over $10,000.00. Years ago a buddy was into speed. He was the General Mnager of a large aero space company. So, when he had a problem a team of some of the worlds best engineers were on it, along with a complete cnc machine shop. There is some great adcvice out here, gonna have to find it. ONce you ge to say 150-175, the question of airframe is going to come up. But, there are some real great go fast airplanes out here, just bring your checkbook. ENJOY
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Old 10-12-2007, 09:47 AM
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Default RE: Go fast mustang

Thanks for all that.My 300mph super bandit satisfies my need for speed.Not looking to throw big money at this mustang.Just curious about propping it best.Can't seem to find a manufacturer who makes higher pitch props in the bigger diameters.
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Old 10-12-2007, 10:40 AM
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Default RE: Go fast mustang

For 150mph you will need alot more than 14" pitch with 8500rpm rpm limit. With a 22x18 you will get about 145mph at 0% slip spinning it at 8500rpm. It will take about 16 horespower to turn a prop this big that fast so you can see you are far short of that with the ZDZ 80 making about 10 at best.
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Old 10-13-2007, 05:52 PM
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Default RE: Go fast mustang

I see apc makes these style props with a hub system.Maybe a 20x16 would work well.I dont want to get too small in diameter,as I'm afraid it wont "hook up".Thanks for the info.

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Old 10-13-2007, 07:15 PM
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Default RE: Go fast mustang

Erik R

Be sure to call APC direct, they do have props available that are not on their list. Not sure what has happened to the wild stuff after some of the engnes started to blow up the props at high rpm. If you strike out, send me a PM, there is a local that lays them up for the "big boys". EnJOY
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Old 10-13-2007, 08:20 PM
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Default RE: Go fast mustang

Yeah, ditto on that call apc direct. I know they make a 19x19 prop that they do not list and there are several others.
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Old 10-14-2007, 04:23 PM
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Default RE: Go fast mustang

Erik

I really don't think U can get the ZDZ80 into the 1/5 scale Mustang. I tried and the biggest I could put in my Pica Mustang was the ZDZ60.

She is turning a Mezjlik 22 * 12 at 6750 rpm on the grnd but she is still breaking in. Speeds straight and level appear to be Mid 80s mph her Wingspan is 90 inches.

Seems the biggest problem was cooling and how to stuff the exhaust in her without hacking the cowl to pieces.

It's fun to fly the Mustang wide open she presents very well in Flight.

The stock design has lots of drag.

Ian
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Old 10-14-2007, 05:38 PM
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Default RE: Go fast mustang

Last weekend we just test flew my buddies 1/5 scale TF mustang, he has a 3W 75 which weighs right at 5lbs, the airframe handled it well, but it has the side carb and side exhaust so he did do a hack job on the cowling. I think he was using a 26x10 or 12 prop, top speed wasn't that great but the huge prop arc really looked good. Plus he was running just an open header, and the noise was very impressive!! You can see the open header in the pic. for comparison my mustang in the back ground is a WM 80in, it's turning an 18x12 prop
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Old 10-14-2007, 09:46 PM
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Default RE: Go fast mustang

mugenkidd

Ur buddie shoe horned that 3W in there real nice.

They sure do sound good with the exhaust opened up. I used my Milling machine to custom make an exhaust for mine. It sounded so sweet ripping by me.

I have full Gear Doors with Centers and a retracting tail wheel as well. But I don't think it would ever go better then 100 mph straight and level.

Ian
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Old 10-14-2007, 10:32 PM
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Default RE: Go fast mustang

Yeah it sounded sweet, but some of the guys at my field ended up complaining that it was too loud!!! But we're in the middle of no where so it shouldn't have been an issue.

We did do some loose formation flying and compared to his mine sounded like an electric ! lol!!!
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Old 10-16-2007, 06:26 PM
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Default RE: Go fast mustang

Here is my ZDZ 60 in my Pica 1/5th Mustang

BTW the Motor had so much pull the Firewall had to be held in with Carbon Fiber .

Ian
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