Jett 50 Question
09-09-2011, 01:25 PM
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Jett 50 Question
I'm planning on running a BSE Jett50 on a Q500 Airframe and was wondering what kind of breakin and prop I needed to use to get the most speed out of it. Just looking for something fast to fly behind the house. I will be running a Jett bubble less tank.
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09-09-2011, 01:36 PM
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RE: Jett 50 Question
I would recommend following the break in instructions you can find on Jett's website if you dig around a little.
If it was my engine, I would probably start with an APC 8.8x8.5 or 8.8x8.75 as good starting places for that engine. Those are the props I'm most likely to use on the .40 426 engine, so they probably aren't too far out of line for the .50 BSE
If it was my engine, I would probably start with an APC 8.8x8.5 or 8.8x8.75 as good starting places for that engine. Those are the props I'm most likely to use on the .40 426 engine, so they probably aren't too far out of line for the .50 BSE
09-12-2011, 06:57 AM
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RE: Jett 50 Question
Sorry for the delay replying......... and thanks guys for helping out........
My suggestion if you are just sport flying the plane good ole 9x7 APC. You can use that for break-in and also for flying.
If you have an old 10x6 laying around - it makes a great break-in prop, just cut it down to 8" diameter and balance it.
The 8.8" props recommended work great too 8.8x8.5 especially.
Break in proceedure is on the website...... but very simply
1) put the engine on a test stand
2) install a 9x7, or cut down 10x6 (you want a cut "big" prop so you have a beefy prop hub at the center, do not use a stock 8x6)
3) fire it up, lean it until it is running around 17,000 17,500 rpm. It will get to that RPM easily and be slightly rich. Let it run like that. Figure 3-4 tanks.
4) put the flying prop on - lean it until you find peak rpm (BRIEFLY), then back off 800-1000 rpm. Let it run for a tank like that. Test the throttle and idle.
5) Fly it - again, set it 800-1000 down from peak to start with. RPM in the aircraft WILL be different than on the bench. That is ok. Just set it down off of peak. You can then lean slightly as you get a few flights on it so it is 600-800 rpm down from ground peak.
Thats it ... nothing complicated.
Bob
My suggestion if you are just sport flying the plane good ole 9x7 APC. You can use that for break-in and also for flying.
If you have an old 10x6 laying around - it makes a great break-in prop, just cut it down to 8" diameter and balance it.
The 8.8" props recommended work great too 8.8x8.5 especially.
Break in proceedure is on the website...... but very simply
1) put the engine on a test stand
2) install a 9x7, or cut down 10x6 (you want a cut "big" prop so you have a beefy prop hub at the center, do not use a stock 8x6)
3) fire it up, lean it until it is running around 17,000 17,500 rpm. It will get to that RPM easily and be slightly rich. Let it run like that. Figure 3-4 tanks.
4) put the flying prop on - lean it until you find peak rpm (BRIEFLY), then back off 800-1000 rpm. Let it run for a tank like that. Test the throttle and idle.
5) Fly it - again, set it 800-1000 down from peak to start with. RPM in the aircraft WILL be different than on the bench. That is ok. Just set it down off of peak. You can then lean slightly as you get a few flights on it so it is 600-800 rpm down from ground peak.
Thats it ... nothing complicated.
Bob
