Not sure what to power this with? This is My first turbine powered jet. I had a little stick time with a buddybox with one powered by a jetcat p-60 @ the Maine Jet Fly.(Thanks again Dave) It was fast enough for Me. My question is would a P-70 be better to learn with? Thanks Clint

I saw Buck Garza fly one with a P60 at GSW and it looked like the perfect combination.

I would look at it from an economical stand point first. If your budget allows I would go for the P-80 because you can always dail down the power, but you can't really add something that isn't there with the P-60. Also take into consideration what you may want to stuff the engine into in the future, there are a lot more great airframes on the market for a 19 pound turbine then for a 13 pound model. That's my humble opinion. The aspect to consider is would the weight difference affect the airframe much. Not being a Bobcat guy, I couldn't tell you. Call BV and ask Bob or David, they'd probably know better then anyone.

Mark

I have the Composite Bobcat with a P-70 and I think the P-60 is just as fast. No it does not have the same vertical. Unless you plan on going to much bigger model you will love the combo. I bought the P-70 with the intention of later installing it in a BVM MIG.
Bob

Bob,
Sound advice!
Has anyone considered "idle" thrust? Does the P80 make landings more difficult with the "extra" idle thrust VS the P60?
I think the P60 has .4 pounds and the P80 has .8 pounds?

Dave Rigotti

more thrust is not just for top end speed .. it will help you maintain consistent speed in the turns, and pulling vertical.. the P60 will bleed off speed very quickly in manouvers ... I always believe more power is safer.... you dont have to use it, but its there when you need it to get out of situations ( like aborting a landing, etc ... ) I have a p120 on mine which i would not recomend to a beginer, but the plane still handles the same either way ..


Wojtek

with even the p120, landings are as easy as any jet i have ever flown .... yeam there is more residual thrust with the bigger engines however ... with the crow mixing , you actually could even use some power on landings in certain situations ...


Wojtek

Consider the Wren Supersport, I have many flights on mine now and it is supurb. I have not fitted the centre tank because I fly for eight mins and theres still fuel left. The Supersport is small, light,18lb thrust and fits straight on the Bobcat mounts without any modification.

Jason

Jason, how many oz. of fuel are you carrying? SS seems to be comparable to P-70?

Joe

I've got one with a P-60 on it and I don't have a problem bleeding in turns.
Problem with crow on the Bobcat is that the wing is kinda thin where the flap servo goes which limits the size of servo arm you can put on the flap servo and I don't think you get enough flap travel.
Then there's the fuel ladder, P-60 is very fuel efficient, so you'll get more flight time. P-60 is the perfect engine for the Bobcat!

I guess it all depends how hard you want to fly .... mild wide and gentle, and you wont bleed speed on a P60 .. start pulling it a bit harder , and you will .. I like to go near 200, and keep it there through the turns..

A friend of mine just swapped his P70 out to a P80 on his BobCat, and says even that small increast of thrust was a great boost in performance ..

if ou consider the total investment, a few more $ to go from a p60 to a p70 is more than worth it ( if not to a p80 or 120 )

either way, this is one fun plane !

Wojtek

I had no trouble getting the recommended flap travel, I can't imagine needing mored than 45 degrees!

Im not too sure how much fuel the two kevlar tanks hold but I guess its just ober 1.5l. the Supersport is a smaller and lighter engine than the p70.

jason

Woj:

I saw Jason fly his KittyCat at FIJR with the WREN SS last week.......no lack of performance here, unless you are really into blistering speed 200 MPH+ speed.......then why not skip the P-80, P-120, and go straight for the Titan?...........

Jason did a superb job of aerobatics including horizontal and vertical rollers, point rolls as well as some very fast passes.....lands very slow at the light weight.......means less banging of the gear for those of us on grass fields as well....

Getting rid of that centerline tank really cleans things up inside....looks almost empty......

And that little SS is a swweeeet motor.......it's been out for about 2 years now.....well tested and refined......

A few shots of Jason's Kitty.......

Tom

I have a Bob Cat composit comming, and was considering either P60 or P70, (I fly of grass most of the time). I asked BV for his recomendation and he said go with the P70. That is what I am doing.

Jason:

Please PM me your shipping addy and phone # again.....the fuse is ready to ship either tomorrow or Tuesday.......final packing today......

Tom

reason i wont put a titan is because of its very non linear thrust curve ... most of the power kicks in at the top end ..My last BobCat had a speedlimiter set to 196 MPH. On the planes first flight my top recorded speed was 199 and an averale of 186 ( tht includes takeoff, aproach, and landing .. ) I never came off of full, and the P120 kept the plane at the desired speed through full elevator turns, snap rolls, rillong circles, continuous and tight figure 8s, etc ... A titan would not have given me anything more in terms of performance. Now if i was goign for top speed, yea, im sure it would be advantageous , but the airframe is not designed for that .. BVM markets this plane to take a beating of Gs within the 200 MPH range, and it takes it very well ... I don't need to go faster on this plane ( my p180 powered Raptor will be my speed deamon )

As a side note I lost my last BobCat by stalling it on take off.. I held brakes untill the engine was at full and wheels were starting to skid on the grass, i let go of brakes, and the plane rotated around 50 feet later, ..I pulled to go to vertical too early ,and airbraked the plane to a stall at no mor than 50' altitude ... the plane was lost, but all equipment and landing gear survived ..

the picture of the blue/yellow one is the one that i lost ... and here is a preview of the one which i hope to have flying again on the p120 in another 2 - 3 weeks ..
( paint by www.uflyhobbies.com )


http://www.bvmjets.com/HotShots/liberty_bell05/lb05.htm


Wojtek

to get the propper travel, i had to add an additional mix to the flap channel mixed off of the flap function switch. I will say that on a P120 I'll take as mch flap as I can get to slow th eplane down quicker, this way i can come in on a little bit of power above idle and have better descent control.

Wojtek

Just a bit of hyperbole Woj.......maybe help get your mind off the AT-400 for a while....

Just letting folks know who haven't seen it that a Wren SS-BobKitty is a very nice combo........plus nice to be able to chat with the original designers of the engine most anytime.........

No doubt the Kitty performs well with a P120.....my flying buddy Dave Elsinger bought Tim Redelman's Kitty at SpiderJets and has been yard darting around for about 50 flights since then with a P-120 on it........told him to take it down to Brazil for the Speed Contest.......should be good for at least 240 per.........

Tom

the at400 has no thrust curve it either runs, or it doesn't [>:]

Thanks to all who replied. Clint

I cant remember how much, but I priced the Wren SS and it seemed way too expensive! It seemed to be a great motor for the Bobcat.
How much are they?
Scott

Scott:

Currently they are listed at $3095.00 from JHH.....don't know what they are direct from Wren....depends on exchange rate......

Expensive.....don't know what that means.....all a matter of priorities.......sort of like a D flawless, rather than a Zirc for your special squeeze ............

Missed you and Joey Big and Joey Little at the Wales this year.......was hoping to see the Black Bunny in action......[]

Tom

Tom

Come on down to Pensacola this weekend. See the Black Bunny in action. Scott, Joey, John and I will be there.

By me not going to L.W., I missed Jane and the CCC

Missed you too Bob-O......were you out snuffing innocent white tail mammals?.....[]

I would really like to make it down.....weather here finally turned sucko.......got to chat with the Air Boss........this is where that D flawless, about 2 Carats +/- might impair the lady's judgement sufficiently to allow me to point the Dee-Rango onto a southerly heading.................