OS FS 91 is it capable ?
10-26-2008, 08:39 AM
#26
RE: OS FS 91 is it capable ?
ORIGINAL: root
An OS FS-91 on a 14.5 Lbs plane is definitely pushing it and your flying skills would be "tested" to say the least.
An OS FS-91 on a 14.5 Lbs plane is definitely pushing it and your flying skills would be "tested" to say the least.
That 91 will fly that plane very well. It would NOT fly an Extra 300 of the same size/weight very well at all, but a Kadet? No problemo.
10-26-2008, 08:14 PM
#27
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RE: OS FS 91 is it capable ?
ORIGINAL: root
s_s,
I flew a club members 40 size Rascal with a Saito 56 and it flew with power to spare.
Beware of too much throttle-too fast on take off which will result in annoying ground loops and tricky bumps of rudder correction.
Yours should be a handful at 1/2 throttle.
Good Luck, I hope you have the chops to handle it.
Bob G
s_s,
I flew a club members 40 size Rascal with a Saito 56 and it flew with power to spare.
Beware of too much throttle-too fast on take off which will result in annoying ground loops and tricky bumps of rudder correction.
Yours should be a handful at 1/2 throttle.
Good Luck, I hope you have the chops to handle it.
Bob G
I know sometime over-powering is over-kill and it probably is with a 70 on a 40 rascal but I love it.
See ya in the air,
Dan
10-29-2008, 06:35 PM
#29
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RE: OS FS 91 is it capable ?
ORIGINAL: root
HA!!!!
Good for you squirrel.
What size prop and what rpm readings are you getting?
Bob G aka root
HA!!!!
Good for you squirrel.
What size prop and what rpm readings are you getting?
Bob G aka root
Thanks
10-29-2008, 08:22 PM
#30
RE: OS FS 91 is it capable ?
squirrel,
12,000 unloaded in the air minus 1000 for static minus another 200 richened is 10,800 in a perfect world:
(the larger diameter props that I personally prefer for torque purposes, as opposed to speed, always spin way below this)
O.S. engine's main man, Bax, is saying in most of his replies that if the engine is rated at 11,000 rpm and it usually unloads about a 1000 rpm in the air, then whatever size or brand prop you use should be giving you 11,000 minus 1000 on the ground (that' 10,000 on the ground or "static") in order to get the most power that the engine has to offer.
Then finally you should richen it (needle turned out-usually) about 200 rpm (so the 10,000 comes down to 9,800 rpm so as not to burn it out by running it too hot.
Correct me if I'm wrong.
Bob G aka root
p.s. Some RC Car and Truck guys use an Infra-Red temperature gauge on the muffler and try for 75 degrees cooler readings then the hottest readings.....again correct me if I'm wrong.
12,000 unloaded in the air minus 1000 for static minus another 200 richened is 10,800 in a perfect world:
(the larger diameter props that I personally prefer for torque purposes, as opposed to speed, always spin way below this)
O.S. engine's main man, Bax, is saying in most of his replies that if the engine is rated at 11,000 rpm and it usually unloads about a 1000 rpm in the air, then whatever size or brand prop you use should be giving you 11,000 minus 1000 on the ground (that' 10,000 on the ground or "static") in order to get the most power that the engine has to offer.
Then finally you should richen it (needle turned out-usually) about 200 rpm (so the 10,000 comes down to 9,800 rpm so as not to burn it out by running it too hot.
Correct me if I'm wrong.
Bob G aka root
p.s. Some RC Car and Truck guys use an Infra-Red temperature gauge on the muffler and try for 75 degrees cooler readings then the hottest readings.....again correct me if I'm wrong.
