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

OPS .67, what plane for it ?

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Old 09-29-2006, 08:39 AM
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Gandalv
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Default OPS .67, what plane for it ?

I have got an OPS .67 marine engine, but see in here that its not good for use in a speedplane []

But thats the engine I got and I am going to give it a shot anyway.

So I hope that some of you nice guys in here can point me in direction of an aircraft for this engine ? and since its my first speedplane it don't have to be to expensive :-)

Any links or name on planes would be appreciated. Have tried looking in here, but not find any.


Any recommendation for a propeller on this engine ?


Thanks.

Best regards from me
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Old 09-29-2006, 11:28 AM
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Razor-RCU
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Default RE: OPS .67, what plane for it ?

Wow, good question... Have you tried searches on here like "OPS" and the like? I am sure some of our engine experts will chime in here soon---

OK I had a minute so here is what I've found...

[link=http://www.rcuniverse.com/forum/m_2890745/anchors_2890745/mpage_1/key_ops%252D67/anchor/tm.htm#2890745]#1 OPS-67 Thread[/link]

[link=http://www.rcuniverse.com/forum/m_2890723/anchors_2890723/mpage_1/key_ops%252D67/anchor/tm.htm#2890723]#2[/link]
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Old 09-29-2006, 01:26 PM
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Default RE: OPS .67, what plane for it ?

Thanks for your answer and the links to the OPS-thread. Seems like I haven't done my homework (search) good enough here [:-]

Then engine have already been converted to an airplane engine (bigger head, a prop-nut etc) so hopefully it will work. If it runs to hot I will give the watertank - perrypump set-up a go/try
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Old 09-29-2006, 02:06 PM
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Default RE: OPS .67, what plane for it ?

Here is a good speedplane for this OPS engine.

Best regards Mr. f3d
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Old 09-29-2006, 04:12 PM
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Default RE: OPS .67, what plane for it ?

Cool have fun and keep us posted on whatever you decide... Every once in awhile it is nice to see someone go against the grain a bit- That is how lousy builders/ designers like me get to buy arf's and kits... We get to benefit from others trials-

F3D (above) and the guy who used the BVM-91 at the German Speed Cup went outside the box in design and thought, truly awesome flying machines!
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Old 09-29-2006, 08:15 PM
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Default RE: OPS .67, what plane for it ?

I would check the weight, when I ran OPS Marine engines ( in boats) they were a bit heavy so a plane with a shorter nose would save adding a ton of tail weight, pipe length and prop will require some experimenting, but it should be fast once setup. If your using the stock single needle marine carb I would opt for a Super Tigre Carb Twin Needle or similar or it will have to be very rich off WOT and no idle or midrange and hard to step up on the pipe when piped for hi rpms.
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Old 09-30-2006, 01:47 PM
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Default RE: OPS .67, what plane for it ?

Thats is one beautiful plane Mr. f3d Your own design if i understand correctly.


Not to keen on making a fiberglass body and wings I will have to try to build i in conventional material like balsa, ply and foam-wings. I am not aiming for any competition-plane, but something that will move Is it possibel to make a wing from foam, balsa w glasscloth that will be fast ? Or have those really fast wings to be made from composite ?

Razor-RCU and captb, thanks for you input.

What carb is the Super Tiger ? >i understand they have some different. Maybe I can use the one thats on my old 10ccm super Tiger ? or is it to small ?

There is on the other hand two needles on the carb thats already on the OPS. Will try to bench-run it first.

But, is there made wood-kit for plane for engines in the 10-15ccm range ?

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Old 09-30-2006, 07:13 PM
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Default RE: OPS .67, what plane for it ?

The largest throat size you can fit is best, here's a link to some and they come up on ebay once in awhile for 15.00 to 30.00 range, I forget what I used but had to file them down before to use the largest possible but they worked great. If you have a twin needle carb on it you may be ok my OPS 67 was a marine single needle and the needle vibrated and broke off fairly often. http://www2.towerhobbies.com/cgi-bin...=++&search3=Go
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