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

10 ccm Speed engine

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Old 05-10-2006, 02:59 AM
  #1  
f3d
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Default 10 ccm Speed engine

A few days bag I got my new 10 ccm FAI Speedengine from H. Nelson.

This engine is special made for the German Speed Cup an the first step for a complete new design for a 10 ccm Speed engine.
I have made a special speed airplane for this engine.
I think the pictures says more than thounsand words
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Old 05-10-2006, 03:42 AM
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HaveBlue
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Default RE: 10 ccm Speed engine

HI f3d..that is an awesome looking engine especially with that huge funnel of an intake!!!!..good luck at the speed cup too

just out of curiosity and since I have never owned one ..what prop will you run on it and what do you expect the top rpm to be?????


cheers
HB
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Old 05-10-2006, 04:10 AM
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f3d
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Default RE: 10 ccm Speed engine

The engine is designed for 25 000 rpm on ground and after a 400 m dive it will see the 30 000 rpm.. Depense on the prop.
I have a lot of different cfk speedprops specialy made for this engine.
Also a lot of differnt tuned pipes for all weather conditions.

Next weeekend I will fire up the engine the first time but so far I think this will be a real screamer.

The crankshaft is realy very very big.

I will put in some pictures of the speed plane later.

Best regards Michael
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Old 05-10-2006, 04:24 AM
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Default RE: 10 ccm Speed engine

some photos of the plane will be cool to see too!..when I enlarged or opened the photo this engine has "OS V" on the crank case .. whats that all about?
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Old 05-10-2006, 04:37 AM
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f3d
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Default RE: 10 ccm Speed engine

Yes it is the crankcase from the OS 65 DF engine and the front end is from bar stock alu made by Henry as all other parts of the engine.

It was to expensive to make a complete new case only for a few engines.

It is planed for the future to make a new case if some more speed pilots are interestet in the engine. But for the moment this design will be the best.

Best regards Michael
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Old 05-10-2006, 09:05 AM
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Default RE: 10 ccm Speed engine

Nice engine! Keep us posted on your design and the cup-
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Old 05-10-2006, 09:54 AM
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MJD
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Default RE: 10 ccm Speed engine

Where's the throttle?

MJD
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Old 05-10-2006, 01:48 PM
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Default RE: 10 ccm Speed engine

a video with the plane screaming would be interesting also!
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Old 05-10-2006, 11:10 PM
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Default RE: 10 ccm Speed engine

Make it a side exhaust and the market is wide open for it.. I'll buy atleast 2 myself..

Smitty
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Old 05-11-2006, 12:28 AM
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Default RE: 10 ccm Speed engine

Hallo speed guys,


here are some photos of the spped plane.

Wingspan 1.2 m, weight 2,3 kg, Profil Nacca 63008, Prop 7,8 x 12

Best regards Michael
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Old 05-11-2006, 05:09 AM
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HaveBlue
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Default RE: 10 ccm Speed engine

no doubt ..that will be one fast combination[sm=thumbup.gif]
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Old 05-11-2006, 05:32 AM
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Default RE: 10 ccm Speed engine

I like the work done on the engine, looks really good. This thing should hook along.

Good luck with it
Tony.
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Old 05-11-2006, 09:44 AM
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Default RE: 10 ccm Speed engine

Nice project - I will follow the thread

I seem to recall Henry making a few of those .61 speed engines about 4-5 years ago. At least one was used on a CL speed aircraft. Should work well for the RC speed stuff too. And being 10cc its eligable for a record attempt.
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Old 05-12-2006, 12:46 AM
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Default RE: 10 ccm Speed engine

Hallo speed fans,

have a look on the following web site to see the news in the German Speed cup

http://www.mfc-osnabrueck.com

on the left site go to speedcup 2006. You can find some good informations and 2 nice vi d e o s.


regards Michael
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Old 05-12-2006, 08:47 AM
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Default RE: 10 ccm Speed engine

7.8 x 12 prop and 30,000 rpm sounds extremely optimistic. What are the other prop sizes you have to test?
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Old 05-12-2006, 10:32 AM
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Default RE: 10 ccm Speed engine

Very nice looking project, F3D! I wish you the best of luck with it. If that engine can turn a 8x12 at 30,000, you should have a very nice time at the Speed Cup!
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Old 05-12-2006, 10:38 AM
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Default RE: 10 ccm Speed engine


ORIGINAL: f3d

Hallo speed fans,

have a look on the following web site to see the news in the German Speed cup

http://www.mfc-osnabrueck.com

on the left site go to speedcup 2006. You can find some good informations and 2 nice vi d e o s.


regards Michael
For reference, what prop sizes are the guys running the BVM/Nelson 96 fan engines using, and what RPM do they tend to produce ?

Bob
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Old 05-13-2006, 02:08 PM
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f3d
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Default RE: 10 ccm Speed engine

Hallo Speedfreaks,

hear some pictures from the finish Speed airplane.
Looks fast and is fast !!

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Old 05-14-2006, 12:49 AM
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Default RE: 10 ccm Speed engine

That plane looks wicked! [>:]
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Old 05-15-2006, 09:01 AM
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Default RE: 10 ccm Speed engine

That prop has just a bit of pitch..

Any specifications on this? Engine, prop etc.?

MJD
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Old 05-15-2006, 09:28 PM
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Default RE: 10 ccm Speed engine


ORIGINAL: HighPlains

7.8 x 12 prop and 30,000 rpm sounds extremely optimistic. What are the other prop sizes you have to test?
I don't know about that just yet... It won't turn up to 30K on the ground, that's for sure. But I don't think that's what he's trying to do either. Out of a vertical 1000' dive however, things change. If he can get it to pipe up as he enters his dive, and keep it on the pipe just long enough to make it through the speed traps, he may have a winner.

And anyway, I don't think this is his first shot at this... so it is not unlikely he kinda knows where he's going with this.
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Old 05-16-2006, 10:32 PM
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Default RE: 10 ccm Speed engine

If I read the web site correctly, the previous fastest airplane at the event did 369 KM/hr. That works out to around 229 mph in the traps, out of a dive. A prop with 12" pitch at 30K would mean a target speed of 340 mph which I find some what unrealistic. That would be nearly 550 KM/hr.

If you assume that the engine produces about 6 hp, the weight of the aircraft in a vertical dive at terminal velocity (340 mph) only adds another 4.5 hp to overcome drag. This is roughly equal to engine power after propeller efficiency is included. It is unlikely to come anywhere close to this speed from a 1000 feet dive.

I think a pitch of 9" would have a much better chance of actually working towards a goal of beating 369 KM/hr.
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Old 05-18-2006, 06:40 PM
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Default RE: 10 ccm Speed engine

OK this plane is beautiful !!!!!!!! I really admire your work! Please keep us all updated ! Man this is one sexy machine ! What is she called?

Completely ONE OFF design correct?????????

Rich

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Old 05-20-2006, 03:50 AM
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Default RE: 10 ccm Speed engine

The racer from Joachim, who builds the kit looks fine. Joachim knows his job. He lives only 30 minutes from here (next to Hahn airbase, some might know), so i visited him to have a look at his project. He is a skilled F3D Racer and will reenter the F3D scene in 2007. So there is quite some knowledge. But Michael is as always far to optimistic - lag of knowledge ? I think he has to do some research. I am looking forward to get one of the beers (no alcohol version please!) Michael will have to spent when he won't reach the 400 km/h ( 250 mph) - he betted at the last pylon contest.

Michael gets spanked by me in Q500 regulary - he will get another lesson again next weekend . I think his only chance to take revenge is the speedcup which is more related to material and not pilot skills [8D][8D]

@ Highplains

The pitch of the prop heavily depends on the RPM and engine (Horsepower). Engines with more power at less RPM need more pitch. so 10,5" to 12,5" are suitable with 90 engines and rpms lower than 25000. But other points like drag of the racer take account, so the prop is the thing which has to be testesd an adapted to the racer and engine carefully. If you do have to much horsepower with to much rpm you will have the problem with the blade tips reaching supersonic speed so reducing diameter is needed. Result of that is that prop Efficiency and thrust will go down. This is the reason why reno racers like rare bear turn large props with very much pitch at 'lower' rpm.
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Old 05-20-2006, 09:10 AM
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Default RE: 10 ccm Speed engine

I think you will be enjoying your beer, wienerschnitzel, kartoffel klöße, and blaukraut at Michael's expense.
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