TT75 or OS surpass 91
12-12-2004, 09:39 PM
#1
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TT75 or OS surpass 91
I just got the great planes stuka and it calls for a .75 2 stroke or a .91 4 stroke. What would you guys recommend? Ive never owned a 4 stroke before. Do they have decent power? Any thoughts would be greatly appreciated.
12-13-2004, 02:56 AM
#3
RE: TT75 or OS surpass 91
ORIGINAL: Warbird Tom
Do they have decent power?
Do they have decent power?
As for having decent power, watch these videos and be the judge:
* [link=http://www.whitetyphoon.com/rc/gsp_spit_show_pass.mpg]Spitfire Show Pass @ 3/4 Throttle[/link] - 12 lbs, 71" span, YS 91FZ
* [link=http://www.whitetyphoon.com/rc/h9_corsair/movies/HighSpeedPass02.mpg]Corsair High Speed Pass[/link] - 10 lbs, 65.25" span, YS 110FZ
* [link=http://www.whitetyphoon.com/rc/vq_p40/movies/blowing_by.wmv]P-40 Blowing Away 2-Strokers[/link] - 9.5 lbs, 63" span, YS 110FZ
* [link=http://www.whitetyphoon.com/rc/dymond_f8f/low_pass_2.wmv]Bearcat Low Pass[/link] - 7.5 lbs, 53.5" span, YS 63S
12-13-2004, 07:52 AM
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RE: TT75 or OS surpass 91
TT75? Do you mean a TH75? Anyway, I'd vote for the 90 fourstroke anyday!!! But it's 3 times the price. I can't imagine that you'd be considering both. The fourstroker would be the perfect fit for your war bird. If you must get a 2 stroke, I would recommend a O.S. in the 90 size. But the fourstroker would be way to go!
12-13-2004, 09:45 AM
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RE: TT75 or OS surpass 91
Actually, I don't like the sound of a big single 4-stroke in planes that had 12 cyl V-engines. The 4-stroker exhaust pulse repetition rate is too low, & a big 2-stroke (90 - 120 size) actually has a note that is closer to a Merlin, Griffon, or Alison.
The 4-stroke definately sounds closer to the throaty clatter of a radial than the 2-strokers, & it is really good in general aviation planes that had 4 & 6 cyl opposed engines.
The 4-stroke definately sounds closer to the throaty clatter of a radial than the 2-strokers, & it is really good in general aviation planes that had 4 & 6 cyl opposed engines.
12-13-2004, 10:04 AM
#6
RE: TT75 or OS surpass 91
ORIGINAL: britbrat
The 4-stroker exhaust pulse repetition rate is too low, & a big 2-stroke (90 - 120 size) actually has a note that is closer to a Merlin, Griffon, or Alison.
The 4-stroker exhaust pulse repetition rate is too low, & a big 2-stroke (90 - 120 size) actually has a note that is closer to a Merlin, Griffon, or Alison.
12-13-2004, 11:33 AM
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RE: TT75 or OS surpass 91
I did exactly that, & the Spit & P-40 don't sound remotely like a Spit or a P-40 -- they sound like a Commanche 260 doing a low pass. The Bearcat & Corsair, however, sound a lot closer to their namesakes than they would with a 2-stroke.
