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Nitro models pusher Bobcat?

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Old 09-04-2006, 09:57 AM
  #326
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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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Old 09-04-2006, 10:05 AM
  #327
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Default RE: Nitro models pusher Bobcat?


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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Old 09-04-2006, 10:31 AM
  #328
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Default RE: Nitro models pusher Bobcat?

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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Old 09-04-2006, 08:26 PM
  #329
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Default RE: Nitro models pusher Bobcat?


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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Old 09-05-2006, 06:40 AM
  #330
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Default RE: Nitro models pusher Bobcat?

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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Old 09-05-2006, 10:36 PM
  #331
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Default RE: Nitro models pusher Bobcat?

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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Old 09-05-2006, 11:04 PM
  #332
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Default RE: Nitro models pusher Bobcat?

Sweet Johhny. Good to see a couple of people having luck with the turbine conversions.
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Old 09-06-2006, 06:23 PM
  #333
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Default RE: Nitro models pusher Bobcat?

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

EMPTY!!!!
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Old 09-06-2006, 07:39 PM
  #334
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Default RE: Nitro models pusher Bobcat?

Topper5, Thanks for the reply. I will post some pictures when I get my retracts installed.
Matty
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Old 09-07-2006, 08:31 AM
  #335
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Default RE: Nitro models pusher Bobcat?

Here is a pic of my retract installation. I am really, really, really slow at building... [:-]

Dave
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Old 09-07-2006, 08:39 AM
  #336
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Default RE: Nitro models pusher Bobcat?

DAVE,

What size are those Spring Airs are those ?

Thanks
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Old 09-07-2006, 10:16 AM
  #337
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Default RE: Nitro models pusher Bobcat?

hapyjac2,
I believe that they are the older 300 series. They have been collecting dust in the shop for a long time (at least 7 years). I looked up retracts.com and unable to find exact match.

Dave
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Old 09-07-2006, 10:29 AM
  #338
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Default RE: Nitro models pusher Bobcat?

those retracts look like my 605 spring air's that i have in my bobcat, page 4 post #90, not to get off the subject but dose any one have any personal exp with the Mark 61 dbb ringed motor, i'd like to replace my ys-45 with a little more p&v with out paying the high dollar for the dubb-jet motor
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Old 09-07-2006, 11:14 AM
  #339
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Default RE: Nitro models pusher Bobcat?

Now I am even more confused... (it doesn't take much... )

The retract is approximately 1" tall, with hole for 3/16" wire. I wanted a softer gear and went with 5/16" wire. The brass tube used to shim the wire can be seen in the picture.

Dave
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Old 09-11-2006, 08:01 PM
  #340
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Default RE: Nitro models pusher Bobcat?

my inst. manual says 6.9" back from the leading edge, if thats true I'll need a cinder block to balnce
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Old 09-11-2006, 08:20 PM
  #341
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Default RE: Nitro models pusher Bobcat?

All flight reports say 9.5" is the correct CG location.
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Old 09-11-2006, 08:23 PM
  #342
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Default RE: Nitro models pusher Bobcat?

OK thanks
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Old 09-11-2006, 08:32 PM
  #343
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Default RE: Nitro models pusher Bobcat?


Quote:
ORIGINAL: airega1

my inst. manual says 6.9" back from the leading edge, if thats true I'll need a cinder block to balnce
there was an updated CG posting of 260 mm i thinks

but I am flying at 10.1" +/-.1
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Old 09-11-2006, 08:35 PM
  #344
airega1
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Default RE: Nitro models pusher Bobcat?

Great thank you
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Old 09-13-2006, 07:26 PM
  #345
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Default RE: Nitro models pusher Bobcat?

Hi guys need advise on the engine and prop size.

1-If i mount a OS91FX what would the prop size, can a 10x7p be used?
2-Would a OS 50fx be enough power for this kitty?
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Old 09-13-2006, 08:47 PM
  #346
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Default RE: Nitro models pusher Bobcat?

hay jephry if you are in SINGAPORE, then you are pretty close to sea level and i would say the 50fx will be plenty of motor for the bobcat,
if you are gonna use the 91fx i would not use smaller then a 11+ prop, in fear of over tacking the motor with a 10x8

(just my 2cents)

im using a ys-45 at about 4,500 feet and im getting 80-90+mph.
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Old 09-13-2006, 10:22 PM
  #347
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Default RE: Nitro models pusher Bobcat?


Quote:
ORIGINAL: jephry

Hi guys need advise on the engine and prop size.

1-If i mount a OS91FX what would the prop size, can a 10x7p be used?
2-Would a OS 50fx be enough power for this kitty?
1) IMO OS91FX the would be too heavy, about 8 oz more than 50SX adding at least 4 oz of nose weight total 12 oz or more, & requires 14x6 pusher prop ground clearance issues arise. Then you would need a larger fuel tank or fly a shorter flight.

2) 50SX is a good choice quality engine and plenty of power. Note this plane was designed for a .45-.50 2-stroke. Mine flys very well with a Dub Jett .50
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Old 09-14-2006, 07:25 AM
  #348
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Default RE: Nitro models pusher Bobcat?

OK I'll throw in my 2 cents. I flew mine last weekend with an O.S.46 and a 10x8 prop tach was reading 11600 rpm. I used a 2400 mah battery pack in the nose. The CG came out around 9" from the leading edge at the root and it was a little nose heavy. The takeoff from grass was about 150' The control throws were as specified in the manual high rate is a little too much on aileron 80% DR seemed more comfortable. The weight is just under 7.5lbs Speed was 70-80 mph no speedster but very comfortable. Landing was as simple as setting up with the runway and holding some up elevator at low throttle and gliding in.
I believe a larger motor could be used without much effort, the only problem is ground clearance for the prop. Perhaps a .61 turning the same 10x8 at higher rpm would work out nicely. Or a dubbjet 40-50 and tuned pipe Oh Yeah!
Gary
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Old 09-14-2006, 10:08 AM
  #349
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Default RE: Nitro models pusher Bobcat?

anyone know who has any in stock?



Jason
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Old 09-15-2006, 02:46 PM
  #350
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Default RE: Nitro models pusher Bobcat?

Got the first flights in on mine today. About all I can say is that it flies. I got two flights in before the nose wheel turned on landing and one of the main wheel blocks popped loose when the plane skidded sideways. Not big deal but a pain to have to fix a plane after two flights. (did I mention I hate nose wheels) I am disappointed with the Saito 72, 11-7 prop combination (I know you told me so). It flew it but it didn't fly it if you know what I mean. Well seeings I have to get into the wing to reattach the landing gear block I am going with my first incliation and putting the 75 two stroke on it. Should be an improvment. For reference my CG is a 10" from the wing at the fuse and it seemed perfect.

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