RE: Nitro models pusher Bobcat?
 

hmm....holes not drilled in wings for landing gear,...no holes drilled in fuse for wing alignment rod...are they all like this?...or did I just get one that was rushed down the assembly line.

RE: Nitro models pusher Bobcat?
 

I had one hole for the landing gear not drilled out and neither hole was drilled on the fuse for the antirotation pin. I used the marks on the sides of the fuse and the one hole is off just enough that the wing is not even with the fuse. So I had to straighten that out to make the wings level. Also the holes in the fuse are not drilled out for the servo wires. So you may have a Monday or Friday kit like I have.

RE: Nitro models pusher Bobcat?
 

Any suggestions on how to mark the fuse where I have to drill to line up with the anti rotation pins?

RE: Nitro models pusher Bobcat?
 

i think all of them were made on a monday or friday, i had to drill holes in the fuse to but they were marked.

worst was one wing panel the top skin was miss aligned with the servo bay and gear mount. poor hot melt glue on the tailboom/ front blindnut plate...came loose in flight!

RE: Nitro models pusher Bobcat?
 

Crazy4Flight
Mine were marked too, but the one mark was off.

Crashpro,
I guess I would drill a 1/16 hole in the center of the mark they have on the fuse. The slide the wing on the spar tube and the use the blue masking tape to hold the wing panel on making sure the wing is in alignment with the fuse and there is no pitch. Then use a flashlight to see if the 1/16 hole is in alignment with the hole on the wing for the anti-rotation pin. If it is then drill it out to the correct size. The do the same thing for the other side.

Maybe someone has a better idea for you.

RE: Nitro models pusher Bobcat?
 

Thanks for the suggestion thebluemax...I didn't understand what you meant by a 'mark' on the fuse until I flipped it over and looked at the other side. Definately a mark on the left side of the fuse, but not one on the right. Not only did I get a Monday morning kit but a HUNGOVER Monday morning kit I guess.

RE: Nitro models pusher Bobcat?
 

I got bit by the designing bug, give me about 6 months. :eek:............

RE: Nitro models pusher Bobcat?
 

The clock is ticking, lol...

We'll wait with anticipation :-)

PM

RE: Nitro models pusher Bobcat?
 

Hello from Spain. I have an ideal turbine for bobcat pusher for sale in Ebay. It is Simjet 700 with 3.17 kg of thrust. Weight 550 grams with autostart.

http://cgi.ebay.es/ws/eBayISAPI.dll?...9068&rd=1&rd=1

Thanks.

RE: Nitro models pusher Bobcat?
 

Hey, that's great! Now, if only I could read SPANISH, knew someone in Spain that could ship it to me and had EUROS to spend, I'd be all set.

The ad looks good but is of little value on this side of the pond, I'd think...

Oh well,

PM

RE: Nitro models pusher Bobcat?
 

{ut a drill bit the same size as the anti rotation pin in the hole in the wing and slide it over the aluminium wing spa, when the drill bit touches the fuse you can rotate the wing on the spa and scribe the fuse, I use this for all these types of models, for what its worth I drilled out the holes and instead of using the the alignment rod I used bolts and blind nuts, you nwill need a right angle driver to get to the bolts unless you have small hands.

Mark

RE: Nitro models pusher Bobcat?
 

Thanks noddy...tried your method for marking the fuse...worked great :D

RE: Nitro models pusher Bobcat?
 

I just drilled the holes where the marks were and got lucky..perfect alignment.....my plan "B" was to make two small squares of plywood and drill them out to fit the rod securely. The holes in the fuse would be enlarged to allow the wings to be alligned properly. Then I would insert the rod in the fuse with the two plywood squares inside the fuselage - one on each side. Then I would install the wings, get the alignment perfect; and tape them in place. finally I would epoxy (or Aeropoxy the two plywood squares to the inside of the fuselage....presto! Automatic alignment!!!

RE: Nitro models pusher Bobcat?
 

Maybe that's what the little pieces of 1/8th ply with the hole I found in the bottom of the box are for. Not a hint in the bogus instructions but sounds like a good way to adjust the wing incidence to me.
Rich Longfellow

Just starting my Christmas present.

RE: Nitro models pusher Bobcat?
 

\

Rich,

Real pilots do not need instructions.[sm=spinnyeyes.gif]
I looked at the Non-Lingual instrustions and then tossed them out.
Remember the CG should be at 10" +/- 1/8.
Early ARFs had the CG at about 6" and was Wrong!

Butonce put together correctly the are easy to fly and Fun!

bob

RE: Nitro models pusher Bobcat?
 

Testing has led me to conclude that the CG is closer to 11" I am very close to 11" right now and the plane still indicates slightly nose heavy in flight. I will not be at all surprised if this plane flys best at 11-11 and 1/8".

The elevator is becomming much more effective and the "tuck" is greatly reduced.

RE: Nitro models pusher Bobcat?
 

That far back?? Interesting

well my bbocat is put away for the winte season. It will get a set ofspringairs and a Jett bubbless tank durring the off season. I will get the CG moved back to 10.5 and then flight test and adjust to suit my style of flying.

RE: Nitro models pusher Bobcat?
 

Yeah sure enough, at 10.3 the plane "felt" nose heavy in normal flight. Everytime a made a turn even though I was trying to keep the speed up it would head for the ground and it would take a second or two of up elevator before I could get a reaction. I put extended control arms on my elevator servos so enough throw was not the problem. I have been working out engine bugs so it was not a priority.

Last weekend I was able to do some inverted climb tests which showed the plane was extremely nose heavy and I removed .75 oz of lead from the nose. The plane immediately flew better and I felt more "connected" to it, the elevator response is much better but still not perfect . Initially in the inverted climb test (with the plane trimmed for level flight) as soon as I established a climb and centered the sticks the plane would dive for the ground. After removing the .75 oz I get a second or so before the nose heads for the ground in the inverted climb test.

So the plane is still nose heavy but not nearly as much, and the CG is now very close to 11". I'm going to fly it this way for awhile because removing additional lead from the nose is going to be a pain in the rear. There is still 1.5 oz of stick on lead weights just aft of the very front former putting it in was a pain taking it out will be even worse. lol

RE: Nitro models pusher Bobcat?
 

Has anybody installed a Webra Speed 55GT on the Bobcat? I am looking for information on which prop. gives the best performance wether it be 2 blade, dimensions please, or a three blade, dimensions also please.

Thank you,
John

RE: Nitro models pusher Bobcat?
 

Would that test be valid with a flat bottom wing and flat bottom stab????? I'd tend to thing some aerodynamics may be at work as well...

RE: Nitro models pusher Bobcat?
 

I'm no total expert but I would think that the sum of the whole will be greater than the sum of the parts. IOW some of it may be explained by the issues you point out but standard weight and balance rules still apply. I can assure you the plane is no where near tailheavy right now.

With every new model I explore I learn more and I meet more people the inverted climb test was suggested to me by a fellow modeler who is very knowledgable about jets and standard planforms. Since you bring up the question I will be sure to talk it over with him but flight results indicate that his analysis and approach are very good.

RE: Nitro models pusher Bobcat?
 

Got my Bobcat today....ordered 12/31 received 1/5. Not bad! (paid with paypal)[sm=biggrin.gif]

RE: Nitro models pusher Bobcat?
 

I found pusher Mufflers
cool
http://www.davisdieseldevelopment.co...ler/pusher.htm

Aslo I have a os 50 sx on my bobcat with a 11x7 pusher prop with the new pusher tuned pipe. I get 20500 rpm and about 162mph out of the combo.

RE: Nitro models pusher Bobcat?
 

I find that hard to believe. Its impossible. 143.5mp/h max,not including drag and prop losses.
But I`m always open for some educating

RE: Nitro models pusher Bobcat?
 

Which engine gives the best bang for the $$$?

I have a Clarence Lee Modified K&B 6550 .61 engines which should get me about 12,000 RPM with a 11.5x7 prop ($135.00). A tuned pipe could raise the RPM to 13,000 ($110.00). Tower Hobbies .75 ABC should give 15,000-16,000 RPM (as they state in their catalog) for about $100.00. There is a small weight gain for the tower engine but it seems to have a lot more power. I know Clarence Lee Modified K&B .61 engines have a good rep...however, I am looking for the best bang for the buck with speed being the main factor.

Is there any other engines in this price range out there that would produce better results?

Thanks,

Larry