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Two Turbines into one exhaust

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Two Turbines into one exhaust

Old 10-27-2020, 03:58 PM
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Halcyon66
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Default Two Turbines into one exhaust

Question, has anyone run two turbines into one exhaust?

Basically a bifurcated pipe in reverse, obviously with a larger outlet diameter,

This is for a large potential project where as you have the additional safety of a twin setup yet in a model with a single exhaust.

Regards,
Old 10-27-2020, 04:16 PM
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sysiek
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Yes , I’m not sure what model it was but lots of guys know this jet from Kentucky jets 2018 and 2019 , same person has the twin joined rebels pro together to one very interested jet
Old 10-27-2020, 04:17 PM
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Airforce7
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I don't think I've seen that done before, but you might want to checkout how the big 1:3 scale F-104 from Airworld setup was done and maybe go that route if your model is big enough.

Old 10-27-2020, 05:15 PM
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I think RCPete did a Havoc

Am
Old 10-27-2020, 06:08 PM
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RC Pete had the twin into one pipe and I have seen somewhere guys in Europe do the same with some huge models.
Old 10-27-2020, 08:00 PM
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Thanks for the replies, yes I have seen the two exhaust setup on the big 104's.

Just wondering if you could port both exhausts into the same exit, not two separate ones.

Regards,
Old 10-27-2020, 08:20 PM
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This is Pete's Havoc with two into one. I'm sure he has some pics of the install somewhere.
https://cimg5.ibsrv.net/gimg/www.rcu...3cf05ce5b5.jpg

Old 10-27-2020, 09:57 PM
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Dave Wilshere
 
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Unless you can guarantee both turbines throttle exactly the same time I think you will have issues with the lead turbine ‘sucking’ on the slower one and that’s if the turbulence didn’t make a horrible sound.
I think you would get more thrust out of the split exit set up too.
Old 10-27-2020, 10:45 PM
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Halcyon66
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Yep that is exactly what I was worried about, basically a pressure differential and not sure where it could affect flows.

Regards,

Old 10-28-2020, 05:36 AM
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Some years back before we had the bigger motors there was a big F86 in Europe set up with two motors feeding into one big pipe.
Old 10-28-2020, 07:10 AM
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LGM Graphix
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I know there are pictures on the internet somewhere but i couldn't find them of this 1/4 scale F16 with 4 G Booster 160 turbines down a single tailpipe.

Old 10-28-2020, 07:18 AM
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Old 10-28-2020, 08:33 AM
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Nice find Jeremy!
Old 10-28-2020, 10:11 AM
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Dave Wilshere
 
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Think you will find the pipe was divided into 4
Old 10-28-2020, 05:00 PM
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LGM Graphix
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Originally Posted by Dave Wilshere
Think you will find the pipe was divided into 4
In the second video you can see right down the tailpipe. Looks like one giant pipe to me. I know I saw pictures of it once too and I am certain all 4 engines just blew down one giant cavernous pipe.
Old 10-28-2020, 05:26 PM
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LGM Graphix
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Here are some pictures of rcpetes havoc with a reverse bifurcated pipe.

https://www.rccanada.ca/rccforum/sho...9&postcount=36
Old 10-28-2020, 05:28 PM
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LGM Graphix
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A few more here

https://www.rccanada.ca/rccforum/sho...5&postcount=14
Old 10-28-2020, 10:04 PM
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Dave Wilshere
 
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I’ll see if I can find the article in an old JetPower on the F-16, I still thought the big pipe was divided.
Pete’s Havoc with the long inlet joining tubes I can see how that worked. So I guess it goes back to the OP and whether he has the big fat fuselage space to do the same.
Old 10-29-2020, 12:10 PM
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Halcyon66
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Yep pretty cavernous space in the fuse so that is not the issue.

As said this a potential project, I have two on the cards as a next build project both with their quirks not sure which way I will go yet.

Thanks for the input.

Regards,

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