RE: Nitro models pusher Bobcat?
 

Hi AGR....didn't put a tach on it, still running it a bit rich as it only had about a half a tank thru it, so I'm nowhere near top RPM yet.
No issues at all with the Pitts. Thanks to your review, and the heads up on the back pressure problem with the stock pipe, I'm glad I went with the Pitts muffler. It was great out there this morning,..had the whole field to myself..Can't wait to get it in the air again..:D

RE: Nitro models pusher Bobcat?
 

Glad to hear it thanks!

RE: Nitro models pusher Bobcat?
 

Guys there are several ways to deal with the exhaust exit facing the wrong way...a couple ideas have been posted recently, I have some more to offer:

Mike Pastro designed a few pushers 10 years or so ago, and the way he overcame the back pressure issue was to attach a small tab of brass strip on the front edge of the exhaust nozzle..sort of a wind deflector...simple and it worked (I own one ( or rather what is left of it..of his prototypes). Simply drill a hole and use a sheet metal screw to attach the brass strip to the exhaust outlet

Mousse can mufflers were the rage a few years ago....for a few bucks you can build one to replace the back end of your current muffler, but have your exhaust come out at an angle facing the rear of the plane. 2-56 or 4-40 fully threaded rod would hold the whole works together..

There are at least 2 off the shelf hardware items that can be purchased at a hobby shop that will reverse the exhaust flow.. I want to check them out first, and it it looks like it will work, I will post the part numbers.

The hobbico deflector is not a real good solution, because it is flexible and vibrates and buffets in the air, as well as gets oil underneath with the result that it will eventually wiggle loose (BTDT ! :D )

RE: Nitro models pusher Bobcat?
 

That is an amazing flying site you have there with excellent facilities..... I wish we had site like that in the UK.

Dennis

RE: Nitro models pusher Bobcat?
 

Thanks bigplumbs....heres a view of the whole field...... http://home.dc.rr.com/maurie/Field.wmv

We're hosting the Best in the West Jet Rally again this year in April...heres some scenes from last years event... http://home.dc.rr.com/maurie/BITW_06_Final2.wmv

RE: Nitro models pusher Bobcat?
 

I wish too...................................

RE: Nitro models pusher Bobcat?
 

This is an interesting box.............. look carefully at the writing on the side..... Picked it up in the UK today for £149.99............. It is intended to get my hand in before I fly my first turbine

Dennis

www.densplanes.co.uk

RE: Nitro models pusher Bobcat?
 

And here it is out of the box.............. A Goldcat or a Bobcat You decide ?

Dennis

www.densplanes.co.uk

RE: Nitro models pusher Bobcat?
 

Hey guys,

A friend of mine just got one bobcat, with Jett 91LX engine and Spring Air 305 retracts.

We would like to get some info about:

1. installing the retracts - does anyone have a write up about the 305's installation ?
2. proper pusher props for the Jett 91 ? (no reverse crank was available unfortunately)
3. how to make the wing detachable from the fuse and not glued, but still properly firm ?

thanks for the tips !

RE: Nitro models pusher Bobcat?
 

1) have not done that yet
2) contact Jett Engineering they should be able to make you one for about $25 + cost of standard crank. http://www.jettengineering.com/
3) I put screw eyes into the wing, in ftont of the wing tube, and slots in the fuse for the eyes to to pass thru and then 2 #64 rubberbands just like the SIG Something Extra. Also I added to flat landing gear staps from the fuse to each wing panel at the tail end of the fuse.

RE: Nitro models pusher Bobcat?
 

I forget what the outside shipping box on mine said, but it wasn't GoldCat or Bobcat. I think some of he decals are different too. But what the heck, as long as the stuffin is right.

RE: Nitro models pusher Bobcat?
 

You got it from Colchester models and you are going to put a Wren 44 in it..

....you lucky dog, you !!!!!!!!!!!!!!



:D

RE: Nitro models pusher Bobcat?
 

Can someone tell me if your balancing this plane upright or inverted? Thanks Dave

RE: Nitro models pusher Bobcat?
 

Upright

RE: Nitro models pusher Bobcat?
 

Well here is my baby. Using a Hobby People Magnum .52 with a 10x6 APC prop. Not getting the speeds I want. Looks like from the feedback I should try a 11x7. First flight the stock landing gear craked the wing on one side. With her new stems she now lands nice and smooth. It looks like everyone's CG is about 10.25 to 10.5 from the leading edge. It that with the fuel tank full or empty??? Still one of the funnest planes I have had and she turns some heads at the field.

RE: Nitro models pusher Bobcat?
 

Thank You Very Much.....

RE: Nitro models pusher Bobcat?
 

I guess the pictures did not upload. I will try again.

RE: Nitro models pusher Bobcat?
 

Here is some more. None of the colors they were selling really did anything for me, but the bunny does.



TOPGUN---THERE CAN ONLY BE ONE!

RE: Nitro models pusher Bobcat?
 

Hey Mattgrant

Where did you get those main gear from?

Cheers

Da Orc

RE: Nitro models pusher Bobcat?
 

I was going to put my wren in her but I have decided to go with the OS 55AX I am using this model as a lead in before I fly my AMD Hawk with the wren in her

Dennis

www.densplanes.co.uk

RE: Nitro models pusher Bobcat?
 

Well after reading the issues with pressure from the forward facing exhaust. I made a new one.
The baffles have been removed. The tuned length is longer as I have replaced the missing section with
A hollow pice of pipe, by doing this i can remove the long silicon joiner used originally.
This is my first ali weld so its ugly but strong and sealed,it will also deal with the pusher pipe issues.

RE: Nitro models pusher Bobcat?
 

Crazy4Flight , we really wanted to go for a reversed crank so we asked Dubb Jett about it and he said he doesnt have any in production and it would take 6 months for it to be ready. Not very pracrtical.. [&o]

RE: Nitro models pusher Bobcat?
 

Here is the place were I got the main gear. Great service and fast shipping. They will be at the AMA show in Ontario if you are in CA.


http://www.goldenskiesrc.com/SLG.html.

RE: Nitro models pusher Bobcat?
 

With all aircraft, if there is a bunch of structure over the wing and nothing under the wing, hang it inverted and look for the CG This way you won't be dealing with a CG over the point of Center of suspension, makes it easier. Also, the ability of the plumb bob to point directly at the CG makes this method easier than having it point on the fuse where you have to assume and guess where the spot on the wing is.

I'm assuming with this though that you are using a CG sling which is a simple enough device to make. It consists of two large loops of heavy cord or light rope hung from a central point, I have a screw going into an exposed rafter. These loops go over the wing of the aircraft OR the back of the wing and around the spinner held in place with the prop on some aircraft. On the same point that you hung the loops of rope, hang a plumb bob. Nothing fancy, a pencil stub, a nut anything with a little weight to it, or an honest to good ness plumb bob, you decide. Now, the airplane itself has been turned into a plumb bob and it points the way for a line from the hook towards the center of the earth just like the the plumb bob is doing. Therefore, the plumb bob is pointing at the center of gravity of your airplane. You can balance your aircraft in 2 axis's with this method, flip it sideways and catch the 3rd and no EXACTLY where that point is on your airplane.

That being said, if you have a Heavy aircraft, close to or over the AMA waiver weight, it might behoove you to get 3 of those digital scales and just do a weight and balance calculation on your airplane. It isn't that hard, but takes more typing and off topic babble than we should do in this thread.

RE: Nitro models pusher Bobcat?
 

Mattgrant, nice job! I have one that I'm just about to glass the wings, retracts are installed and just finishing the details on the booms and off to the paint room.

Where did you get the clear canopy?

Angus