Hey guys,

Im trying to put a P-120 pipe in my original classic bandit. I ordered the pipe/bypass assembly for the Super Bandit. The outer pipe slides in but the flanges for the screws hit the fuse and prevent it from going in further. I tried bending them back so it would slide further, but if it were to go all the way to the next former the outer pipe would go all the way to the back end of the bypass. Im considering aeropoxying a couple blocks of hardwood just inside the fuse to screw the outer pipe to. This might also be a stupid question, but has anyone run a classic bandit without the outer pipe? Here are a couple pics of what Im talking about...

Thanks,
Mike

Just made a measurement, the outer pipe is sitting 3.5" aft of the front edge of the inner pipe. If I pushed the outer pipe in to the first former, it would go 4 1/4".

An awful lot of the bypass setups, have the outer pipe lap onto the bypass. Does this place the inner pipe too far inside and too close to the turbine?? I am not very familiar with the Bandit setup and I am sure many will chime in who are. But unless this place the bellmouth on the inner pipe too close to the engine or the discharge end too far inside the tailcone of the plane, I'm not sure you have a problem.
Roger

Think I figured it out...there is a small former on the bottom that the stab mounts to. I think that is the former that the outer pipe screws to, only because the spacing all works out. The problem is that there is no room on the former for the flanges. Im just going to aeropoxy a couple basswood blocks inside to screw it to.

There is a large rod coming off of the back, looks to be some kind of pipe retainer assembly. Anyone have any pics of how that attaches to the pipe?

Mike

bro

I'm sure someone will chime in but if not you can always call and talk to Tom or David tomorrow.

c'ya in a month or so

buck

The reason you are having a problem with the fit is because the Super Bandit has a different fuselage that the original Bandit that you have. The Super Bandit has a wider fuselage, and is slightly taller, giving it more interior volume.

The two tabs on the pipe mount to the frame aft of the stab mount on the Super Bandit. See the attached photograph, and you can see how much larger the Super Bandit is over the Classic Bandit.
The outer pipe (cooling shroud) leading edge starts 2" aft of the bypass tube.

Stay away from the stab mount frame on the bottom of the fuselage!! No holes allowed! Weaken it, and you won't have an airplane!!!!!
I think that you have the right idea...a couple of block strategically located should take care of the problem.

If you install the blocks on the inside of the fuselage, you can remove the carbon fiber rod. It wnt to the aft end of the pipe on the original installation with the pipe that was supplied with your airplane.
Having the correct pipe would have saved you alot of trouble.

Roger,
The bypassed BVM set-ups do not have a bellmouth....the end of the INNER pipe telescopes over the aft end of the bypass tube. The pipe is held onto the bypass tube with a pair of straps. The inner pipe is NOT too close to the engine nozzle.

Need any more help, call me.

Harley Condra
BVM REP
JetCat REP
406-752-8409

Hou come the pictures came out so #$%^^^#@@&*^%#$ big???

Harley

Harly,

How about that post that sticks out the back. It has a SHCS through it with a nut. Do I drill a hole in the pipe and put the screw through it? Not sure what to do with it...

Mike

Here is a pic of what I have come up with so far...

I just put 2 basswood blocks just inside the aft lip so I can screw it much like Harly's. My next problem is that the outer pipe won't fit through the tailcone. Looks like Im going to have to trim the tailcone back by about 2" to make the hole bigger. I put a line of tape around the cone where I would have to cut it (see pic).


HARLY: Did you say to remove the aluminum retainer?? (see second pic) Also, you mentioned this would have been easier if I had the proper pipe...Do they even make a different pipe for the classic vs the super?

One last thing, with the pipe setup where it is, there is nearly 3" to the point where the outer pipe starts from the bypass...any thoughts?

that should be fine .... just make sure at the rear, the outer pipe overlaps the iner by around 1/4" or more .. this will allow the exhaust hasses from the inner to also pull cool air in between the outer and inner pipe .


Voy

On the original Bandit, the outer pipe did not overlap the end of the inner pipe as Wojtek suggests. The dimension would be more like .700 than .250 anyway.
There was a small augmentor nozzle that fit the taper of the tailcone, and had room for about .187 around it for airflow to evacuate warm air from the fuselage from around the outside of the cooling duct (outer pipe). It extended .700 aft of the inner pipe to provide suction through the outer pipe.

The outer pipe was constructed from .003 aluminum (almost as thin as foil), inside three plywood plates that you glued to the workbench to form a construction jig.
In turn, it was screwed to the inner fuselage structure and ended up at the augmentor nozzle, which is .004 stainless steel.

What you now have, is a pipe that was designed for a larger diameter fuselage, requiring you to remove the aft end of the tailcone of your airplane, and rigging a bunch of band-aids to install it.

The Super Bandit bypass tube is the same size as the Super Bandit for the engine you are using. This means that the standard Classic Bandit exhausty pipe will work.

I just called BVM and talked to David Shulman, who has informed me that he will exchange your Super Bandit pipe for the NEW IMPROVED DOUBLE WALL Classic Bandit pipe, as long as your pipe isn't modified.

Don't modify the airplane until you talk to him....give him a call.

Harley Condra
BVM REP
JetCat REP

Harley,

Thanks alot! Spoke with Bob himself this afternoon, should have my new pipe in a couple days! I figured something had to be wrong with this. You were right that I was sent a Super Bandit pipe to put into the Classic Bandit...I can see how the confusion happened.

Again,
Thanks!
Mike

You are welcome, Mike.
Sometimes it is better to contact the factory or a factory rep for the answer, rather than ask on this forum.
Many times people with no experience with the subject jump in, and confuse the issue.
"Uncle Bob" is a nice guy, and nobody knows his products better than he does.

Whenever you order Bandit parts, be very specific, because there are 5 variants with the word "Bandit" in the full name out there.

Harley Condra
BVM REP
JetCat REP

Thanks for chiming in, I tried to be sufficently ambiguous about "some bypass arrangements" and cover my backside by saying I was unfamiliar with Bandit setups. LOL
Roger

Roger,
My point exactly.
Harley