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

Telemetry from a 60 size mustang

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Old 07-18-2006, 06:39 PM
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r-c-guy
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Default Telemetry from a 60 size mustang

Hi everybody,

I too have purchased a telemetry unit. It yields altitude, rpm and real time airspeed via a pitot tube. I purchased a 60 size mustang (from ebay-believe it or not) and eliminated all but 1/2 inch of the belly scoop. This plane is purple, yellow and black, wingspan about 65 inches and fully sheeted. Flying weight is 8.25 lbs. For $150.00, it is a good deal. I powered the bird with an OS vrdf 91 using ab 11x10 apc prop. The engine also utilizes a full wave muffled pipe with manifold pressure to the tank and 15% omega fuel.

I tested the speed indicator by mounting the wing on top of my van about 18 inches above the roof and brought her up to 60 mph. The reading of the telem unit was 60 mph and the van's speedometer read 60.4mph. This was reproducible. I also tried it at 70 mph later on and the result was the same.

Coming down at a shallow dive from 400 feet, the plane did 164 mph top end. I later downloaded the data and found that the engine was turning 21,200 rpm. The data recorder transmits real time and then also stores data for later download.

My friend Jerry is going to help me put retracts on it, clean up the cowling and pipe area and other drag inducing areas. Possibly the use of an 11x9 or a cut down 11x10 or 11x11 might yield even more speed. We hope to push her nearer to 200.

I would welcome any ideas on how to accomplish this goal.
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Old 07-18-2006, 06:40 PM
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Default RE: Telemetry from a 60 size mustang

Hi again....The picture I uploaded was a stock picture. I could upload actual photos if anyone is interested.....
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Old 07-18-2006, 06:52 PM
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Default RE: Telemetry from a 60 size mustang

Post it! I'm interested in seeing what ya have.

Tim
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Old 07-18-2006, 08:07 PM
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Default RE: Telemetry from a 60 size mustang

RC guy, What was the static rpm reading with an 11/10 prop?
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Old 07-18-2006, 08:45 PM
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Default RE: Telemetry from a 60 size mustang

Believe it or not, we did not take one. Next time we go out, we will get one ... probably Thursday....

randy
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Old 07-18-2006, 08:53 PM
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Default RE: Telemetry from a 60 size mustang

rc-guy

I have collect two 90 vrdf units intending to create something of the same thing. The German speed guys have these things down pat. Recommended prop to me was a 10 X 10 carbon fibre prop or if not available, a apc cut down to that size. Watch the prop, the rpm's you are turning are past the recommendation limits. ENJOY Keep us posted.
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Old 07-18-2006, 09:30 PM
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Default RE: Telemetry from a 60 size mustang

Rc-guy:

Sorry, forgot to tell you, don't use more than 5% nitro in that thing or the life span will be squat. The 10 X 10 should be good for 22-22500 Engine will turn 24 but is asking for trouble. See ya
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Old 08-10-2006, 12:38 PM
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Default RE: Telemetry from a 60 size mustang

Update on telemetry ...
By cleaning up the airframe a bit and changing spinners, we are now up to 173 mph. Still using 11x10 apc with 15% omega.
RPM was 21,450 ish
Does anyone think a 10x11 might work better?
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Old 08-10-2006, 08:14 PM
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Default RE: Telemetry from a 60 size mustang


ORIGINAL: r-c-guy

Hi again....The picture I uploaded was a stock picture. I could upload actual photos if anyone is interested.....

I'd like to see it since I have the same plane. Flew it alllast year and rebuilt it better. Have a G2300 on it and put a solid front end. Moves along about 120mph. at most.
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Old 08-10-2006, 08:19 PM
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Default RE: Telemetry from a 60 size mustang

Where did you install the Pitot tube on the plane?
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Old 08-10-2006, 09:12 PM
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Default RE: Telemetry from a 60 size mustang

Hey, r-c-guy, where do you and your friends fly? I live over in Sav, and I fly at the Chatham field.
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Old 08-11-2006, 07:10 AM
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Default RE: Telemetry from a 60 size mustang

I will post some new pictures early next week........

randy
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Old 08-11-2006, 07:12 AM
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Default RE: Telemetry from a 60 size mustang

It's installed at the leading edge of the left wing at the 60% point...

randy
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Old 08-11-2006, 07:13 AM
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Default RE: Telemetry from a 60 size mustang

We fly at a sod farm in Bluffton.....
Call me .... 843 338 2097

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Old 08-11-2006, 08:55 AM
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Default RE: Telemetry from a 60 size mustang

can you post a few photos of the plane, engine, and the FDS installation ?? thanks
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Old 08-11-2006, 11:19 AM
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Default RE: Telemetry from a 60 size mustang

Is this the Eagle Tree system?
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Old 08-11-2006, 01:39 PM
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Default RE: Telemetry from a 60 size mustang

Yes it is... It works great

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Old 08-11-2006, 01:41 PM
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Default RE: Telemetry from a 60 size mustang

Yes I will but it can't be till next week.........
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Old 08-12-2006, 08:12 AM
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Default RE: Telemetry from a 60 size mustang

Which fds are you referring to?
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Old 08-12-2006, 11:34 AM
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Default RE: Telemetry from a 60 size mustang

Your prop tip speed well exceeds critical mach and is close to the speed of sound. I suspect a lot of prop noise. If your airframe is clean enough maybe a 10" prop with a very high pitch would work better. You would still exceed critical mach though. It would take a 10x14 to equal the load factor of the 11x10.

While O.S. rates the engine at 4.8 hp at 22,000 rpm, Thrusthp shows over 10 hp to turn a 11" prop at 21,450. Not disputing your #'s but wonder whats going on.

The O.S. site says this about fuel for your engine --

Fuel with 20% MINIMUM lubricant content and 20%-50% Nitromethane
Wildcat Ducted Fan fuel exceed these requirements

Interesting thread, keep us informed.
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Old 08-12-2006, 04:15 PM
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Default RE: Telemetry from a 60 size mustang

I have this exact plane I bought on Ebay a year ago as a junker. I installed a G2300 and a Jettstream muffler. It also weighs in a hair over 8lbs. I stripped it over the winter and rebuilt it and installed new retracts and a solid front end instead of a cowl. This turned into one of my better flying planes at a speed of around 110mph. This being a 5000ft. Now at sea level i would expect maybe 125 for this thing.

I hate to poop on your parade here but your boasting speeds of 165mph going for 200 on a 90VRDF with this airframe and this weight. Now I have seen a 165mph Diamond Dust or a Magnum. I'm sorry here but I just don't buy any of this. I know the power a 90VRDF but this whole thing just does not wash with me. I know you tested ithe pitot tube on your truck and compared with the speedometer. I simply don't beleive it these speeds on this plane
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Old 08-12-2006, 09:59 PM
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Default RE: Telemetry from a 60 size mustang

I can only tell you what the Eagletree readout states. We checked it against my van at 60 mph and it was within one mph of the states speed of the speedometer of the van. I cannot calibrate it at 150 or any other value over 70 or 80 mph since it is illegal to go that fast.
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Old 08-12-2006, 10:07 PM
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Default RE: Telemetry from a 60 size mustang

By the way...what prop and rpm is your 2300 turning?
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Old 08-12-2006, 11:04 PM
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Default RE: Telemetry from a 60 size mustang

The thing is a G2300, not a VRDF Mine is a 110mph plane. At sea level, maybe 125mph. Plus I am at 5000ft, With the engine you have up front, There is no doubt you could take this plane easy but 165mph? Not to start a qualm here but thats seems a bit much for this type plane at that weight. Was this out of a 1000ft dive? Maybe then, but I would like a more realistic number from level flight.

To get off track here, about a year and a half ago, we had a "radar gun"day. I knew their were going to be alot of disappointed pilots out there. Everyone was alway looking at other planes guessing speeds much higher than they actually were for years.. Propjets were going 130mph, Giant scale gassers at 120 plus and the whole thing. It was like catching a bigggggg fish. The speeds increase each time the subject came up.

So on this day, one guys big gas warbird average 98mph out of a high speed dive. He was very disappointed. My red Ultra Sport with a Jett 90 made it to 115 mph but its a 8lb plane and my DC F20 with a Jett 50 made it to 120mph. Now take in consideration our altitude here, these speeds are about as good as we are going to get. Jett gets 14500 on a 90 and 12something apc in Texas but i run the same thing and 12,500 rpm is tops up here.





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Old 08-13-2006, 07:56 AM
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Default RE: Telemetry from a 60 size mustang

I can only tell you what the readouts were. And yes, they were out of a shallow 400-500-- foot dive. Maybe we can get a video.....
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