Two turbos into one combustion chamber

[xxxx]

Hi, I've been lurking for a couple of months and am tossing around a few ideas and designs for my first jet project, I've searched all over the net and cant find anyone who has connected two turbos to one combustion chamber, I'm assuming that any slight pressure imbalance between the two turbine inducers would cause one to run away, is this correct? Is there a way two balance the pressures in the turbines or am I barking up the wrong tree.

Matt.

[stoffe64]

that has been done already, atleast one guy in here have constructed such....Nick Haddock AKA nick the safe has tried it, dont now the exact details except that i Believe it was two huge Garrett TV94 so it was a qite impressive thing AND complicated.
cheers/stephan

[Deleted]

Works lovely :-) have a look at youtube for 'Turbonator' jet mini www.youtube.com/watch?v=cMJFG4eqI8E , Dan Goodwin bought the engine off me and 'Un-complicated' it....got her starting on scuba air and fitted a much bigger burner nozzle, mine was only good for idle. While he went for dual jet pipes, would save weight to combine into one, so you have two intakes, two compressors feeding one large burner, divide the burner outlet into the two turbines then combine the turbine outlets back into one for a fully balanced system... :-) This can be increased to three (isn't someone doing that?) or more if you fancy some complex pipework :-)

[Deleted]

I meant to respond also to the 'imbalance' worries...it's not an issue.

[pitciblackscotland]

Hi Nick, I have been thinking of building a triple turbojet or quad turbojet engine as i have 4 x T18 turbocharges, but sometime in the future i will start this project.

Cheers,
Mark.

[Deleted]

Yeah that's the spirit Mark :-) keep the weight down by combining all into one burner and one exhaust, and from what i learned - don't get hung up on complicated systems.

[pitciblackscotland]

Hi Nick, Yep will keep it un-complicated as much as i can. I did keep my eye on your twin build thread many years ago on the DIY site very impressive i must say :-)))) Did you have trouble with electric starters? I have been looking at Sals twin turbo jet projet i like the pipe work he done on it.

Cheers,
Mark..

[Deleted]

Electric starters are OK with ball bearing rotating assemblies but not hydrodynamic, you end up having to back off the oil pressure to spin em up and that's never a good idea. most guys don't even use rev counters anymore. Scuba air is a proven reliable and fast spool up method and about the only 'clever' thing you want is an oil pressure switch to cut the fuel supply. I had so many interlocking systems that the wind had to be in the right direction and the moon in the correct phase for it to even think about lighting up! But she runs good now, thanks to Dan, Richard and Andy with their merciless tearing out of all the complications fitting the air start and an even larger burner nozzle...