Nitro models pusher Bobcat?
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RE: Nitro models pusher Bobcat?
ORIGINAL: qlacombe
I also had problems getting the nose to rise on takeoff. CG seems fine once in the air. I will add some height to the front wheel to add some lift from underneath . Question is, how much do I add? 1 inch, 1 1/2 inch, 2 inch?
I also had problems getting the nose to rise on takeoff. CG seems fine once in the air. I will add some height to the front wheel to add some lift from underneath . Question is, how much do I add? 1 inch, 1 1/2 inch, 2 inch?
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RE: Nitro models pusher Bobcat?
ORIGINAL: Larry Legg
Can this be achieved by adding downward thrust to the engine?
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RE: Nitro models pusher Bobcat?
for those of you who have not run pusher engines before, you need to keep your ground running to a minimum, because there is no prop blast blowing cooling air over the engine, they will over heat. If you have to do some running on the ground, throw a tractor prop the same size on, do your tuning, then switch the props back when you are ready to fly.
Also keep the engine fairly rich...the excess fuel and oil help carry heat away from the engine when it is running..If you feel you need to tweak it to get every last RPM out of it, your engine is too small..go for more cu in, and run it a bit rich....if they lean out in the air, it will overheat quickly...Again, no prop blast over the cylinder... If the cooling demands are more than relative airflow can disappate, the engine heats up...
Also keep the engine fairly rich...the excess fuel and oil help carry heat away from the engine when it is running..If you feel you need to tweak it to get every last RPM out of it, your engine is too small..go for more cu in, and run it a bit rich....if they lean out in the air, it will overheat quickly...Again, no prop blast over the cylinder... If the cooling demands are more than relative airflow can disappate, the engine heats up...
#1430
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RE: Nitro models pusher Bobcat?
Jynx, I am not ready to give up yet. It will stay with me for a while. This is a lot of information. I have a stock muffler on the engine with an exhaust deflector cut off to prevent air from entering the muffler in flight. My landing gear are upgrades but are at the stock location. I have many things to try now. I appreciate all of the information. Thanks to everybody for the help. Quentin
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RE: Nitro models pusher Bobcat?
Stick Jammer, about the fuel tank, it is installed fuel lines to the front of the plane with the fuels lines running back along the tank to the engine. Quentin
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RE: Nitro models pusher Bobcat?
My Bobcat arrived today from Nitro Planes. The quality looks quite good. I'm very pleased at this point. I have several other projects that I need to complete before I start this one, so it will be a while before the o'l Bobcat flies.
Best wishes and good safe flying.
Heli-NuBee (Roger)
Best wishes and good safe flying.
Heli-NuBee (Roger)
#1433
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RE: Nitro models pusher Bobcat?
Guys,
I put 4 more flights on my Bobcat with SpringAir retracts this weekend. I don't know how this thing flys stock, but with the retracts, it is really neat! I don't know what the top speed is, and I really don't care too much - its fast enough. It takes off easily with just a bit of backpressure (the retracts are probably 2"+ ahead of the stock location), flys and tracks straight, doesn't have any really nasty slowspeed habits (although it will drop a wing sometimes in a stall, but it stays controllable with aileron), and actually lands quite well. I bounced it on the first two landings, but after I figured out how to get it slow enough, that's not really a problem anymore.
Its a really fun plane to fly and makes a great jet trainer for my son Louie!
Bob
I put 4 more flights on my Bobcat with SpringAir retracts this weekend. I don't know how this thing flys stock, but with the retracts, it is really neat! I don't know what the top speed is, and I really don't care too much - its fast enough. It takes off easily with just a bit of backpressure (the retracts are probably 2"+ ahead of the stock location), flys and tracks straight, doesn't have any really nasty slowspeed habits (although it will drop a wing sometimes in a stall, but it stays controllable with aileron), and actually lands quite well. I bounced it on the first two landings, but after I figured out how to get it slow enough, that's not really a problem anymore.
Its a really fun plane to fly and makes a great jet trainer for my son Louie!
Bob
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RE: Nitro models pusher Bobcat?
Original: CrashPro
I didn't see the video, was it aileron or elevator flutter? Seems odd that the ailerons would pull out due to the crash.
Unfortunately, it did not make it to the ground unscathed,...those nose wheel landings get ya every time. Canopy was smashed, ailerons were pulled out, he was lucky to have enough control left to get it on the runway. This blows,...it was only the 3rd flight on the plane. Maiden and the second flight today was good.
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RE: Nitro models pusher Bobcat?
ORIGINAL: qlacombe
Stick Jammer, about the fuel tank, it is installed fuel lines to the front of the plane with the fuels lines running back along the tank to the engine. Quentin
Stick Jammer, about the fuel tank, it is installed fuel lines to the front of the plane with the fuels lines running back along the tank to the engine. Quentin
If you haven't already, I would check the vent and clunk lines in the the tank to make sure everything is in order. You mentioned earlier that adjusting the needle didn't help so it still sounds to me that the engine is running lean for some other reason. You also mentioned that you had two different engines act the same way and one of them previously ran fine in another plane. This also points to possible fuel delivery problems.
#1436
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RE: Nitro models pusher Bobcat?
Hi all I have been reading these comments re the Nitro Bobcat ,
I would like to add that I have had over 30 flights with the the Bobcat and apart from replacing the undercarriage wires due to quality I am very pleased with the model .
It sits level on the ground ,take off is almost hands off on a grass strip with a small bump from the nose wheel when airspeed Is reached , climb out Is smooth with no real Input required, quickly reaching a very high climb out rate
landings are nose high touching down on the rear wheels then settling onto the nose wheel as it should .. there are no real Issues taking Into account that It Is a pusher model with common sense being applied re the set up
engine Is an OS 50 Heli using an 11*6 prop but I do feel that 11*7 would be an Improvement,
CG is where the Instructions suggested .
Position of the U/C is reversed as it should be closer to the CG,
Muffler is a standed OS muffler with mods made as per page 22 In the Instruction manual,
It will be one that that I will keep in my stable and looks cool in the air ,
comments are that it needs retracts to look even better which I agree and I know others are getting one after seeing mine perform
Cheers G
I would like to add that I have had over 30 flights with the the Bobcat and apart from replacing the undercarriage wires due to quality I am very pleased with the model .
It sits level on the ground ,take off is almost hands off on a grass strip with a small bump from the nose wheel when airspeed Is reached , climb out Is smooth with no real Input required, quickly reaching a very high climb out rate
landings are nose high touching down on the rear wheels then settling onto the nose wheel as it should .. there are no real Issues taking Into account that It Is a pusher model with common sense being applied re the set up
engine Is an OS 50 Heli using an 11*6 prop but I do feel that 11*7 would be an Improvement,
CG is where the Instructions suggested .
Position of the U/C is reversed as it should be closer to the CG,
Muffler is a standed OS muffler with mods made as per page 22 In the Instruction manual,
It will be one that that I will keep in my stable and looks cool in the air ,
comments are that it needs retracts to look even better which I agree and I know others are getting one after seeing mine perform
Cheers G
#1437
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RE: Nitro models pusher Bobcat?
Muffler is a standed OS muffler with mods made as per page 22 In the Instruction manual,
#1439
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RE: Nitro models pusher Bobcat?
put 2 flights on my bobcat last night. flew awesome! had no problems with radio this time.
first flight was a hand full until I got it trimmed out. landed awesome. slow and smooth.
Had no problems with plane jumping off ground, but I removed stock wire gear and installed
aluminum landing gear. cant wait to fly again!!!!
first flight was a hand full until I got it trimmed out. landed awesome. slow and smooth.
Had no problems with plane jumping off ground, but I removed stock wire gear and installed
aluminum landing gear. cant wait to fly again!!!!
#1440
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RE: Nitro models pusher Bobcat?
Awesome! Glad your radio problems are gone. Not knocking anyone's preference on antenna choice but I really don't see the need for a whip style antenna on this plane.
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RE: Nitro models pusher Bobcat?
ORIGINAL: craigdyer
More pics...Dry weight is 3.6kg and springair 301 retracts.
Regards Craig
More pics...Dry weight is 3.6kg and springair 301 retracts.
Regards Craig
If it would not be too much trouble, can you show us some pictures inside and out of how you installed your retracts in the nose ?
Thanks,
Michael
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RE: Nitro models pusher Bobcat?
ORIGINAL: Stick Jammer
Awesome! Glad your radio problems are gone. Not knocking anyone's preference on antenna choice but I really don't see the need for a whip style antenna on this plane.
Awesome! Glad your radio problems are gone. Not knocking anyone's preference on antenna choice but I really don't see the need for a whip style antenna on this plane.
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RE: Nitro models pusher Bobcat?
Craig
Do you have a close up of your motor mount? I like the way you did it with the aluminum. I used blocks on mine.
I flew mine three times last weekend. It is a blast with a 44. I don't have retracts on mine but plan on putting them on the kitbashed version I posted earlier in this thread.
Hal
Do you have a close up of your motor mount? I like the way you did it with the aluminum. I used blocks on mine.
I flew mine three times last weekend. It is a blast with a 44. I don't have retracts on mine but plan on putting them on the kitbashed version I posted earlier in this thread.
Hal
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RE: Nitro models pusher Bobcat?
Country shooter,
Have you posted pics of the modification you are talking about? I haven't found them. I'm a little confused by what you are calling the stabalizer arm and where you did the adjustment.
Thanks,
flying_Phil
Have you posted pics of the modification you are talking about? I haven't found them. I'm a little confused by what you are calling the stabalizer arm and where you did the adjustment.
Thanks,
flying_Phil
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RE: Nitro models pusher Bobcat?
Sorry, havent had time to test fly this week but once I get her going the way I like it Ill post a vid. I'm still waiting for my bubbleless tank(tettra tank) cause I'm alittle nervouse flying inverted.
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RE: Nitro models pusher Bobcat?
Original: MMallory
Other than the whip possibly being a cosmetic choice, I really don't see the advantage. I'd be interested in reading any hard data that proves a whip antenna gets better reception than a properly installed stock wire. I would think that if this were true the radio manufacturers would supply a whip instead. At any rate, I've never had any range problems whatsoever by using the stock antenna on all of my planes including several that are fully concealed within the airframe.
There isn't a need for a lot of stucff we are putting in this cheap little plane. I think that is part of the fun, seeing all of the neat mods done to this bird. As for the whip, it is the best way to place the antenna for optimal signal capture, you could argue a whip should be on every plane.
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RE: Nitro models pusher Bobcat?
yes I did and I'm learning alot here. but the reason I'm moving things around is when the plane is flying straight and level my elevator is pointing upward meaning nose heavy but yet doing a turn it does a tip stall very easy. and flying inverted lots of down elivator is need for level flight. now its flying much better but still elevator is up alittle and inverted are almost hands off.