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RE: Nitro models pusher Bobcat? - 9/3/2006 6:13 AM   
EASYTIGER


 

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Status: offline 		Looks great. Sounds like a good engine, never run a Tower 75 myself.
Reverse clunk...well...been there, done that. The clunk must be going towards the rear of the plane, or you WILL dead stick, sooner or later. Best of luck with that.

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RE: Nitro models pusher Bobcat? - 9/3/2006 8:59 AM   
Johnny Isaiah Woods


 

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From: Hendersonville, TN, USA
Status: offline 		I am having trouble loading pictures and I left
the video camera at home today, but with that said,
I was able to maiden my Turbine Jetjoe JJ1400 with
just minor problems. The flight was fast but I could
not trim out for a smooth flight. The plane weight
9 1/2 lbs dry and carry 70 oz of fuel. I moved the
landing gear 2 inches forward to help rotation and
it rotated perfect. A turbine is the way to go. The
problem turned out to be bad rudder servos that
would not center and in fact failed in flight off
center causing the nose to always drop. I will
correct this and try another flight sunday.

Johnny

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RE: Nitro models pusher Bobcat? - 9/3/2006 9:50 AM   
dragonpilot



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quote:

ORIGINAL: EASYTIGER

Looks great. Sounds like a good engine, never run a Tower 75 myself.
Reverse clunk...well...been there, done that. The clunk must be going towards the rear of the plane, or you WILL dead stick, sooner or later. Best of luck with that.



Yes, you must install the tanks in reverse direction and reverse clunk. In other words, your tank is mounted front side back and your clunk has to also be reversed or looped around to front of the tank (which is now facing the rear of the plane). Sorry for the confusion on this, I can send you a diagram if you need one, it's quite simple.


and yes, with the new rebuild the engine, the Tower engine is great, plenty of power for the size plane/prop.

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RE: Nitro models pusher Bobcat? - 9/3/2006 4:57 PM   
algofly


 

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Status: offline 		Test flew my Bobcat yesterday. Flew great but had to dead stick land it. Used a SuperTiger61 that I had laying around. Found one of the main gear blocks broke loose. Cut into the wing and found a very weak mounting installation. Suggest cutting both wing panels open and reglue the gear blocks and add more framework to support the load and shock of grass runways.

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RE: Nitro models pusher Bobcat? - 9/3/2006 5:07 PM   
wilerbee2


 

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Status: offline 		Well,

I maiden-ed mine today and it flys fine. CG is at 9and 1/2 inches and still a tad nose heavy but otherwise OK. Next flight will try 10 inches. I powered mine with a China made outrunner brushless on a 3 blade 12 x 6 prop with a 5s1p 4000mah battery pack. Enough power for my style of flying but a bit slow for speed demons. The main gear being so far back from the CG did not allow the plane to ROG without elevator input, but once elevator is pulled it leaps into the air. However, this layout did allow me to have a super smooth landing and once on the ground the plane did not have any tendency to bounce. I did tend to come in a bit hot though !! Hope all of you that have this kit to have as much fun as I did !!

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RE: Nitro models pusher Bobcat? - 9/3/2006 10:33 PM   
papasmurf


 

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Status: offline 		Glad to see the electric conversions are working. When the larger "kee kat" arrives I plan on powering it with an outrunner of some sort. I would be interested in hearing some more details of your setup.

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RE: Nitro models pusher Bobcat? - 9/3/2006 11:00 PM   
Crazy4Flight



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From: Milford, MI, USA
Status: offline 		Today I broke in the Dub Jett BSE.50
It lit right up and has a great idle without adjustment.
Tomorrow the Bobkat goes out for its flight.

5 cell pack all the way forward and 2.0 in front of and .5 oz lead at F2 (nose gear mount) put the C.G. at 10.0-10.1"

bob

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RE: Nitro models pusher Bobcat? - 9/4/2006 1:28 AM   
dragonpilot



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quote:

ORIGINAL: wilerbee2

Well,

I maiden-ed mine today and it flys fine. CG is at 9and 1/2 inches and still a tad nose heavy but otherwise OK. Next flight will try 10 inches. I powered mine with a China made outrunner brushless on a 3 blade 12 x 6 prop with a 5s1p 4000mah battery pack. Enough power for my style of flying but a bit slow for speed demons. The main gear being so far back from the CG did not allow the plane to ROG without elevator input, but once elevator is pulled it leaps into the air. However, this layout did allow me to have a super smooth landing and once on the ground the plane did not have any tendency to bounce. I did tend to come in a bit hot though !! Hope all of you that have this kit to have as much fun as I did !!




To clarify between the Point of balance or the Neutral point and the CG.

If your models point of balance is at 9 1/2" and it flies nose heavy, This tells you your NP is further forward. If the CG of your airframe is 10" and you are trying to balance at the CG then you are even more nose heavy than at 9 1/2" considering not moving any weight around. If you move weight further back from the nose from a balanced aircraft, your NP will be aft.
Here is a useful diagram to help.


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< Message edited by dragonpilot -- 9/4/2006 6:03 AM >

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RE: Nitro models pusher Bobcat? - 9/4/2006 5:16 AM   
Mr.Burns



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If you're nose heavy at 9 1/2 you'll want to move the CG forward, not back to 10"!
[/quote]


Hmmm.... something doesn't sound correct here!

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RE: Nitro models pusher Bobcat? - 9/4/2006 6:11 AM   
MattyC-130


 

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Status: offline 		If your nose heavy move the CG aft not forward!!!!!!
Matty

< Message edited by Lightfoot -- 9/4/2006 4:04 PM >

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RE: Nitro models pusher Bobcat? - 9/4/2006 6:13 AM   
MattyC-130


 

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Status: offline 		Is the 10" CG with fuel tank empty or full?
Matty

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RE: Nitro models pusher Bobcat? - 9/4/2006 6:26 AM   
dragonpilot



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quote:

ORIGINAL: MattyC-130

If your nose heavy move the CG aft not forward!!!!!!
Matty


Balancing the model at the manufacture's recommend CG of 10.3" proved too nose heavy during my flight. The CG of the aircraft is determined by the design, however, the point of balance is changed depending on your style of flying and how you want the aircraft to handle, Refer to my posted diagram above.
..going to do some shots now.

< Message edited by Lightfoot -- 9/4/2006 4:06 PM >

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RE: Nitro models pusher Bobcat? - 9/4/2006 7:42 AM   
malibuplt


 

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Status: offline 		For you guys that have flown it. Roughly, how much runway are you using. I want to buy one but, I fly at 9,000 ft msl and I am cocerned about getting one airborne up here. Any feedback would be appreciated.

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RE: Nitro models pusher Bobcat? - 9/4/2006 5:34 PM   
SJN



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Status: offline 		60-70 meters on rough grass.

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RE: Nitro models pusher Bobcat? - 9/4/2006 6:16 PM   
H.Dale


 

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Status: offline 		Flight Report Wren MW44:

I flew mine with the MW44 yesterday. The performance was very similar to the one I saw with an OS 61 on it. On the first flight it was nose heavy and I did not have enough up in the elevator but we got it up and down okay. The second flight was perfect except for a flame out on the turbine. It dropped in from about 15-20 feet but only bent the landing gear. This is a pretty strong little bird.

Two suggestions, turn the wheels outward on the main gear. It needs a wider stance. It was very unstable on takeoff. Second, make sure you have plenty of elevator.

Otherwise it is going to be a fun airplane to fly. I think it will be even better with a MW54 or P60 and retracts.

Hal

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RE: Nitro models pusher Bobcat? - 9/4/2006 6:19 PM   
malibuplt


 

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Status: offline 		We have a 40 x 600ft paved runway, but I am still concerned. It would stink to put one together and not be able to fly it. I would put at least a .61 in it. Maybe a turbine on down the road.

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RE: Nitro models pusher Bobcat? - 9/4/2006 6:57 PM   
rcguy!



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quote:

ORIGINAL: H.Dale

Flight Report Wren MW44:

I flew mine with the MW44 yesterday. The performance was very similar to the one I saw with an OS 61 on it. On the first flight it was nose heavy and I did not have enough up in the elevator but we got it up and down okay. The second flight was perfect except for a flame out on the turbine. It dropped in from about 15-20 feet but only bent the landing gear. This is a pretty strong little bird.

Two suggestions, turn the wheels outward on the main gear. It needs a wider stance. It was very unstable on takeoff. Second, make sure you have plenty of elevator.

Otherwise it is going to be a fun airplane to fly. I think it will be even better with a MW54 or P60 and retracts.

Hal


Hal,
What does it weigh?

Dave Rigotti


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RE: Nitro models pusher Bobcat? - 9/4/2006 7:05 PM   
A10FLYR



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quote:

ORIGINAL: malibuplt

We have a 40 x 600ft paved runway, but I am still concerned. It would stink to put one together and not be able to fly it. I would put at least a .61 in it. Maybe a turbine on down the road.


I have flown with Dave by the school there a few times and I don't think you would have a problem with a .60, or even a good .40.


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RE: Nitro models pusher Bobcat? - 9/4/2006 7:31 PM   
booker-RCU



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quote:

ORIGINAL: H.Dale

Flight Report Wren MW44:

Hal


Way to go!!!
How about some pics?

Also need final C.G.
Weight
Turbine mount
Time of flight on 32oz
Wheels and brakes
anything else you can think of.
Thanks - Galen







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RE: Nitro models pusher Bobcat? - 9/5/2006 5:26 AM   
mugenkidd



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quote:

ORIGINAL: malibuplt

For you guys that have flown it. Roughly, how much runway are you using. I want to buy one but, I fly at 9,000 ft msl and I am cocerned about getting one airborne up here. Any feedback would be appreciated.



check out my video at the end I show how quick you can get off of a rough grass field. Thats with a GMS .76 and a 10x8 pusher, the performace maybe a little better with the apc 11x7.. and/or better engine.

http://members.cox.net/adeloney/babybobcat.wmv

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RE: Nitro models pusher Bobcat? - 9/5/2006 3:40 PM   
wilerbee2


 

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Status: offline 		Papasmurf,

The motor has 633kv and using about 45a full throttle. The ESC is E-Max 60A and the battery is of no name barnd that I got from the factory in China 5s 1p 4000 mah rated at 20-30C. The motor is actually best with an APC 13 X 6 prop, but it looks cooler with the 3 blader. I would like to try 12 X 7 or even 12 X 8 but the shops don't carry any of these sizes. One modification I forgot to mention, I rebuilt the horizontal tailplane as a flat plate instead of using the one in the kit. I feel that the flat bottom section will lift the tail too much while flying and will always cause a nose down tendency. The turbine bobcat has a large upthrust ( the exhaust points down ) but this kit has almost a zero thrustline. Just my 2 cents !!

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RE: Nitro models pusher Bobcat? - 9/6/2006 7:36 AM   
Johnny Isaiah Woods


 

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From: Hendersonville, TN, USA
Status: offline 		Bobcat/ Jet Joe JJ1400

Flew the Bobcat the second time with all problems resolved
and what a dream plane for the price. It is a rocket and
that is not at full throttle. The performance with the JJ1400
is better than that of a Yellow Stingray with my Ram 500.
In fact, I compared the Stingray wing to the wing of the
Bobcat and they were almost identical(outer part). The
Bobcat is a Stingray with booms and elevator. This is the
cheapest turbine/plane you can buy. I have a video, but
it is super 8MM and not digital.

Johnny


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RE: Nitro models pusher Bobcat? - 9/6/2006 8:04 AM   
mugenkidd



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Status: offline 		Sweet Johhny. Good to see a couple of people having luck with the turbine conversions.

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RE: Nitro models pusher Bobcat? - 9/7/2006 3:23 AM   
topper5


 

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Status: offline 		MattyC-130: YOUR Q WAS. Is the 10" CG with fuel tank empty or full?

EMPTY!!!!


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RE: Nitro models pusher Bobcat? - 9/7/2006 4:39 AM   
MattyC-130


 

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Status: offline 		Topper5, Thanks for the reply. I will post some pictures when I get my retracts installed.
Matty

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