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-   -   By-Pass Question (https://www.rcuniverse.com/forum/rc-jets-120/7162785-pass-question.html)

AndyAndrews 03-01-2008 08:52 PM
By-Pass Question
 
I have a Skymaster F-16 1/6. Getting ready to maiden any day but have a question. I was only going to use the bottom part of the bypass as a shield when someone told me that I should go ahead and use the upper part to.

Question: The bypass bumps up to (touches) the thrust tube bell house. Should I cut it to match the distance of the turbine from the tube or just keep it. It covers the tailpipe of the turbine.

Thanks,
Andy

tp777fo 03-01-2008 09:37 PM
RE: By-Pass Question
 
I vote for using the entire bypass. In my Avonds F-16 he specifically sez to not run the motor at high power setting without the top of the bypass to keep from collapsing the pipe. I dont want to experiment to find out if it matters. I personally think it will help the airplane with the bypass as the airflow will be cleaner through the motor vs the turbulence through the fuselage without it. I think they have lots of advantages for very little work.

AndyAndrews 03-01-2008 09:56 PM
RE: By-Pass Question
 
ORIGINAL: tp777fo

I vote for using the entire bypass. In my Avonds F-16 he specifically sez to not run the motor at high power setting without the top of the bypass to keep from collapsing the pipe. I dont want to experiment to find out if it matters. I personally think it will help the airplane with the bypass as the airflow will be cleaner through the motor vs the turbulence through the fuselage without it. I think they have lots of advantages for very little work.
I ran mine with it on and it seemed like it got really hot from the heat of the tailpipe on the turbine. Is that normal? Also, what about the gap issue? One other thing, the Skymaster bypass does not go completely over the thrust tube. It just bumps up to it. Not a perfect seal so to speak like others that wrap over the bell house.

Steve Collins 03-01-2008 10:21 PM
RE: By-Pass Question
 
There should be no gap at all between the bellmouth and the aft end of the bypass.

tp777fo 03-01-2008 11:02 PM
RE: By-Pass Question
 
They will get hot during a static run, that's normal. In flight they get the airflow to cool them down. I really dont thing the gap is a big issue as long as the bypass is securely attached and the turbine exhaust is centered with the tailpipe. A picture would help

AndyAndrews 03-02-2008 07:03 PM
RE: By-Pass Question
 
1 Attachment(s)

ORIGINAL: tp777fo

They will get hot during a static run, that's normal. In flight they get the airflow to cool them down. I really dont thing the gap is a big issue as long as the bypass is securely attached and the turbine exhaust is centered with the tailpipe. A picture would help

Here ya go: The best one I could get. Its not mounted just laying on top of the motor.

Thanks again for all of your help.

Andy

Randy M. 03-02-2008 09:13 PM
RE: By-Pass Question
 
I would not use it the way it is in the photo. Does your engine line up with the tailpipe? ie- center of the enigine= center of tailpipe.

AndyAndrews 03-02-2008 09:38 PM
RE: By-Pass Question
 
1 Attachment(s)
Yes it does. The bypass doesn't match the circumferance of the bellhousing. It's warped as you can see.

See pick.


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