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Engine basics => Engine set up tips => Topic started by: t michael jennings on March 03, 2009, 09:20:11 AM
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Gentlemen,
I am considering in building a P-40 Warhawk that requires a .25 cu in engine.
Which manufacture and model number is considered a good .25 cubic inch engine that has the following characteristics:
light weight
steady running
effective muffler
light muffler
reasonable economical
Smoke'em if you Gott'em
Drink'em if you Brought'em.
t michael jennings :o
knoxville, tn
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The OS .25LA is still available (I think) from Tower Hobbies. It meets all your criteria. Likewise the Enya .25 SS is available from Randy Smith. It's a stronger engine, but a bit heavier (and a few $$ more); and will last forever if properly broken in.
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I'll second the OS .25LA. Meets most of the criteria on your list, although the muffler isn't really all that light. The Brodak .25 would come in second but has a price tag about $30 more than the OS.
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The Enya SS30 has the same case as the Enya SS25 and it is lighter. Mine runs pretty constant with an APC 10.5x.4.5 with a RingMaster.
And there is the "Enya SS25 AL Chro S Pro" AAC with aluminum piston and chromed aluminum liner which is lighter then the SS30 and SS25. This is probably the strongest .25 engine on the market and it comes with a high precision NVA.
Martin
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The Brodak 25 would be high on my list to consider. The muffler is light enough, so that tends to make the $30 (?) higher price a wash. I like my OS .25LA, but the plane needs the stock muffler and more to balance. I wouldn't recommend the OS unless you were willing to pop for an aluminum backplate (TT GP .25, OS .25FP or Curtiss Shipp's CNC'd ones), a good NV up front (Randy Aero's)...all of which make the darned thing cost more than the Brodak .25.
But FWIW, a club member has a "Black Tiger" P-40 that started out with a Fox .36 angle plug engine...the .25LA worked out a lot better, and flies it well. y1 Steve
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The Brodak 25 would be high on my list to consider. The muffler is light enough, so that tends to make the $30 (?) higher price a wash. I like my OS .25LA, but the plane needs the stock muffler and more to balance. I wouldn't recommend the OS unless you were willing to pop for an aluminum backplate (TT GP .25, OS .25FP or Curtiss Shipp's CNC'd ones), a good NV up front (Randy Aero's)...all of which make the darned thing cost more than the Brodak .25.
But FWIW, a club member has a "Black Tiger" P-40 that started out with a Fox .36 angle plug engine...the .25LA worked out a lot better, and flies it well. y1 Steve
I bought a Brodak 25 once but it had no compression so I traded it for some balsawood. I also bought a Enya 25 that had no compression. I bought new piston and linner for it and now it starts a lot better. I would recomend the OSLA25 as the better of the 3 for someone just getting into this size engine despite what other people have said about them. We have had a lot of beginners here that started with the OS. HB~> HB~>
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Gentlemen,
I am considering in building a P-40 Warhawk that requires a .25 cu in engine.
Which manufacture and model number is considered a good .25 cubic inch engine that has the following characteristics:
light weight
steady running
effective muffler
light muffler
reasonable economical
Depends on how big a model we are talking about. As you know, all 25's are not alike and "25-sized airplane"s are not alike. I had an OS 25S baffle-piston motor on a Jr. Nobler and it wasn't unreasonable. Put a 25FP or a 25FSR on the same airplane and it's insanely overpowered and would be difficult to control. As far as I am concerned, a "25" could mean anything from a Shark 15 to a Green Box Nobler.
The choices available right now, new, are fairly limited - either a Brodak 25 or a OS 25LA. I haven't been very impressed with the power of the 25LA compared to either the 20 or 25FP, but it's pretty reliable once you seal up the backplate. I have no experience with the Brodak engine but Bob Reeves says its pretty good. I think both are pretty inexpensive and reasonably light, but you *want* the good muffler on the LA, and it's not outrageously heavy on an appropriately-sized airplane.
Brett
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The Enya SS30 has the same case as the Enya SS25 Martin
Intriguing. And the SS35 has the same case as the 30. We always said it was a real small 35. quite a "quart in a pint pot"
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Brodak .25. its light, AAC P&L, I believe a much longer life than an OS. Its not a converted R/C motor.
Wayne
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Haven't read what anybody else has said, but what about a Brodak .25
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OS 25 LA. You might need to order a Venturi from Lee's Machine shop if you can't find a CL version!
Brodak 25 is great too, hust a little higher price. OS first choice for friendly operations!
Terry