Nitro models pusher Bobcat?
02-04-2007 | 07:33 PM
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From: Indio,
CA
RE: Nitro models pusher Bobcat?
ORIGINAL: dragraces
So the last set of pictures it is DEFINITLY on wrong everyone agree ??
So the last set of pictures it is DEFINITLY on wrong everyone agree ??
Yes,..prop is definately on backwards...and speaking of props,...look at this one,...while flying today, the high speed needle valve bracket broke, letting the needle valve assembly get sucked into the prop. Don't have a clue why it did that,..snapped in half.
02-04-2007 | 08:24 PM
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From: cleves,
OH
RE: Nitro models pusher Bobcat?
Thats how my prop is on now just like the chipped one if i face it horizontily just like the 1 in his pic the blunt side is on the right and ginsu side on left facing up
Jason
Jason
02-05-2007 | 12:45 AM
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From: Austin, TX
RE: Nitro models pusher Bobcat?
ORIGINAL: CrashPro
Yes,..prop is definately on backwards...and speaking of props,...look at this one,...while flying today, the high speed needle valve bracket broke, letting the needle valve assembly get sucked into the prop. Don't have a clue why it did that,..snapped in half.
ORIGINAL: dragraces
So the last set of pictures it is DEFINITLY on wrong everyone agree ??
So the last set of pictures it is DEFINITLY on wrong everyone agree ??
Yes,..prop is definately on backwards...and speaking of props,...look at this one,...while flying today, the high speed needle valve bracket broke, letting the needle valve assembly get sucked into the prop. Don't have a clue why it did that,..snapped in half.
Forget ever thinking about letters and direction. Commonly your engine rotates counter clockwise looking at the cranshaft. So on a pusher craft/prop, your prop leading (thicker) edge hits the air first. Then your trailing blade edge should be closer to you (looking at the crankshaft) than the leading edge thereby forcing the air toward you. Make sense?
Crashpro, I have this happen 2x with a Tower .75 engine. That metal is stamped and weak and eventually will fail. Be advised on this to anyone flying this engine, you must reinforce this mounting, use a piece of carbon fiber or flat bar or something. There are voids in the stamped metal used and the vibration of the FG fuse will lead to the failure.
02-05-2007 | 08:57 AM
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From: South Plainfield, NJ
RE: Nitro models pusher Bobcat?
Landing. The plane will only hop if you have too much airspeed or if you slam it into the ground. Many jets are designed with the gear behind the cg. The key is not to land it like a sport plane. You should try to make a square on your approach and have the plane slowed down on the downwind and your final approach should be nose high (much higher than a non-jet type). Throttle will dictate your descent.
When mine touches down I am holding full up and it gently settles on the mains, rolls a bit and the nose comes down. No bent gear yet.
I hope this helps.
When mine touches down I am holding full up and it gently settles on the mains, rolls a bit and the nose comes down. No bent gear yet.
I hope this helps.
02-05-2007 | 09:10 AM
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From: Indio,
CA
RE: Nitro models pusher Bobcat?
ORIGINAL: dragonpilot
Holy cow, I've never seen such debate over prop direction. Poor dragraces,,, Your prop is on the right way! according to this picture you took.
Forget ever thinking about letters and direction. Commonly your engine rotates counter clockwise looking at the cranshaft. So on a pusher craft/prop, your prop leading (thicker) edge hits the air first. Then your trailing blade edge should be closer to you (looking at the crankshaft) than the leading edge thereby forcing the air toward you. Make sense?
Crashpro, I have this happen 2x with a Tower .75 engine. That metal is stamped and weak and eventually will fail. Be advised on this to anyone flying this engine, you must reinforce this mounting, use a piece of carbon fiber or flat bar or something. There are voids in the stamped metal used and the vibration of the FG fuse will lead to the failure.
ORIGINAL: CrashPro
Yes,..prop is definately on backwards...and speaking of props,...look at this one,...while flying today, the high speed needle valve bracket broke, letting the needle valve assembly get sucked into the prop. Don't have a clue why it did that,..snapped in half.
ORIGINAL: dragraces
So the last set of pictures it is DEFINITLY on wrong everyone agree ??
So the last set of pictures it is DEFINITLY on wrong everyone agree ??
Yes,..prop is definately on backwards...and speaking of props,...look at this one,...while flying today, the high speed needle valve bracket broke, letting the needle valve assembly get sucked into the prop. Don't have a clue why it did that,..snapped in half.
Forget ever thinking about letters and direction. Commonly your engine rotates counter clockwise looking at the cranshaft. So on a pusher craft/prop, your prop leading (thicker) edge hits the air first. Then your trailing blade edge should be closer to you (looking at the crankshaft) than the leading edge thereby forcing the air toward you. Make sense?
Crashpro, I have this happen 2x with a Tower .75 engine. That metal is stamped and weak and eventually will fail. Be advised on this to anyone flying this engine, you must reinforce this mounting, use a piece of carbon fiber or flat bar or something. There are voids in the stamped metal used and the vibration of the FG fuse will lead to the failure.
These pictures are from post #1086...which I said was the correct way...Thanks for the info on the needle valve bracket.
Tower Hobbies sell the carb and the needle valve assembly together for the .75,...for the .46 they sell it separately,..darnit....guess I have to buy a new carb too.
02-05-2007 | 09:25 AM
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From: Ocala,
FL
RE: Nitro models pusher Bobcat?
With an APC prop the hub has a solid side and a side with molded in open spaces. The open spaces always go towards the engine and the solid is always towards the prop nut. On the 10/7 pusher I am using the lettering is on the solid side and therefore faces the rear of the plane. On wooden props the flat side faces to the rear as others have described.
Rich
Rich
02-05-2007 | 09:34 AM
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From: Crete,
IL
RE: Nitro models pusher Bobcat?
Original: MMallory
Not trying to be rude but this is a no-brainer. The mains have to be behind the CG or the nose gear would never touch the ground. Its how far behind the CG that is the issue.
Many jets are designed with the gear behind the cg.
Not trying to be rude but this is a no-brainer. The mains have to be behind the CG or the nose gear would never touch the ground. Its how far behind the CG that is the issue.
02-05-2007 | 10:07 AM
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From: South Plainfield, NJ
RE: Nitro models pusher Bobcat?
ORIGINAL: Stick Jammer
Original: MMallory
Not trying to be rude but this is a no-brainer. The mains have to be behind the CG or the nose gear would never touch the ground. Its how far behind the CG that is the issue.
Original: MMallory
Many jets are designed with the gear behind the cg.
Not trying to be rude but this is a no-brainer. The mains have to be behind the CG or the nose gear would never touch the ground. Its how far behind the CG that is the issue.
Mark M.
02-05-2007 | 10:22 AM
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From: Crete,
IL
RE: Nitro models pusher Bobcat?
Didn't mean any offense. I haven't flown mine yet so I don't know what to expect but I moved the gear forward 3" from the stock location and installed new blocks in a lateral position instead of fore to aft. They are about 2" behind the CG now instead of 5". It seems that it would be very difficult to hold the nose gear off the ground once the mains touch down with the gear in the stock location. I've watched plenty of Bobcat style turbines land and for the most part they do hold the nose wheel off the ground for a second or so after the mains are on the pavement.
02-05-2007 | 10:39 AM
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From: rancho mirage, CA
RE: Nitro models pusher Bobcat?
02-05-2007 | 06:19 PM
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From: Scottsburg, IN
RE: Nitro models pusher Bobcat?
Dragraces:
From the pictures your prop looks to be correct.
one way to be certian is to look streight at your engine from behind the aircraft, the engine will run in a counter clockwise motion so therefore you can feel the props leading edge(if in fact this is an APC prop which looks to be)it will be countoured and smooth as with the trailing edge
will be very sharp.Hope this helps.
"Chuck"
From the pictures your prop looks to be correct.
one way to be certian is to look streight at your engine from behind the aircraft, the engine will run in a counter clockwise motion so therefore you can feel the props leading edge(if in fact this is an APC prop which looks to be)it will be countoured and smooth as with the trailing edge
will be very sharp.Hope this helps.
"Chuck"
02-06-2007 | 12:48 PM
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From: Miami,
FL
RE: Nitro models pusher Bobcat?
Which is the best engine for a Bobcat 52? I wnat to go fast, but I don't want to put a turbine. Could you give me the options, please?
