OS .61 SF-P
09-17-2004, 01:38 PM
#1
Thread Starter
My Feedback: (41)
Join Date: Apr 2004
Location: Marietta,
GA
Posts: 156
Likes: 0
Received 0 Likes
on
0 Posts
OS .61 SF-P
Hi guys, I have thie engine in a new condition and was considering putting it on a fast plane. Could this engine move a 10X10 prop with the OS pre tuned pipe for these engines? Is this a good engine for speed or should I better consider this engine for another use? As I have this engine not in use and want to build a speed plane, what kit would you recommend if this is feasible.
Thanks and bets regards,
Homero Cuellar
Thanks and bets regards,
Homero Cuellar
09-17-2004, 03:54 PM
#2
My Feedback: (19)
Join Date: Apr 2002
Location: Cleveland,
OH
Posts: 5,576
Likes: 0
Received 0 Likes
on
0 Posts
RE: OS .61 SF-P
Greetings Homero.....
The engine you described is a late 1980's OS "long-stroke" pattern engine. I owned a few of these. In fact, I still have one brand new one still in the box. They develop a lot of power.
They were designed for lower rpm, but they have a bunch of power and torque. For pattern, the engine was combined with an Hatori 750 pipe, set up fairly long, and we typcially flew them with an 11x10, 11x11 or 12x10 prop, which would turn in the neighborhood of 10K - 11K rpm. With that combination, one could get an Aurora, Tipo, Omen or LA-1 to really move along at wide open throttle, and we were able to pass the sound limits quite easily
The only real issue the engine had was the bearings.
For a speed application, I would imagine you could use the engine if it were set up and propped correctly. You would want to keep the engine down below 12,000 rpm. Smallest prop I would suggest here would be an 11x9 or 12x8, and you would have to set the pipe length accordingly.
As for an airframe, it is obviously very at home in an older style pattern ship. Something like the new Patriot XL would be good as well, if you could work out the fuel system plumbing.
I hope this is helpful.
Bob
The engine you described is a late 1980's OS "long-stroke" pattern engine. I owned a few of these. In fact, I still have one brand new one still in the box. They develop a lot of power.
They were designed for lower rpm, but they have a bunch of power and torque. For pattern, the engine was combined with an Hatori 750 pipe, set up fairly long, and we typcially flew them with an 11x10, 11x11 or 12x10 prop, which would turn in the neighborhood of 10K - 11K rpm. With that combination, one could get an Aurora, Tipo, Omen or LA-1 to really move along at wide open throttle, and we were able to pass the sound limits quite easily
The only real issue the engine had was the bearings.For a speed application, I would imagine you could use the engine if it were set up and propped correctly. You would want to keep the engine down below 12,000 rpm. Smallest prop I would suggest here would be an 11x9 or 12x8, and you would have to set the pipe length accordingly.
As for an airframe, it is obviously very at home in an older style pattern ship. Something like the new Patriot XL would be good as well, if you could work out the fuel system plumbing.
I hope this is helpful.
Bob
09-19-2004, 07:09 PM
#3
Senior Member
My Feedback: (37)
Join Date: Mar 2002
Location: Hilton Head Isl,
SC
Posts: 204
Likes: 0
Received 0 Likes
on
0 Posts
RE: OS .61 SF-P
I have one with full wave pipe in a 55 inch mustang turning 11x8 at 16+k in the air...
It scoots along nicelt. With the ducted fan 77, it really moves out...
randy
It scoots along nicelt. With the ducted fan 77, it really moves out...
randy
09-20-2004, 11:51 PM
#4
Thread Starter
My Feedback: (41)
Join Date: Apr 2004
Location: Marietta,
GA
Posts: 156
Likes: 0
Received 0 Likes
on
0 Posts
RE: OS .61 SF-P
Thanks Bob, indeed the info was helpful, I will try and decide into what plane I'll put this engine to. Maybe as you suggest, a pattern would make the engine just like home...
Thanks,
Homero
Thanks,
Homero
