Category Archives: turbine

Motorjet to startTurbojet

G’day All,
it’s been a while but I’m back!
(too many Projects, too little money)

Iv’e been working on a Starter Motor for the Turbo Jet project,
I don’t know weather you can make it out from the pix but it’s a Cox .049 ci
with a puta fan blade attached!
(yes Brad it IS the same motor I used on the model boats we made as teenagers!)

Appearntly people tried using puta fans as ducted fans in the early days but,
found them to be useless cos the crappy plastics they were made of used to
fly apart when exposed to 22,000 + rpm
(I wonder why?)


But thankfully puta fans now are made out of tough ABS plastic,
which should be up to the task!
Some of the better quality fans are actually balanced!
(you can see the dremel marks on some the back of the blades!)

Cox went out of buisness in Feb 2009 but Iv’e found a shop
in Canada that has a warehouse full of motors and parts!
(and he does bulk lots too! I bought 6 piston/conrod/cylnder assys for
less than 30 bucks au, including postage!)

You can still get the parts to make a replica “Black Widdow Venom”
(the originals were only a run of a 1000 and are very rare!)
BTW, FYI, the “Black Widdow Venom’s” were the motors that could pull
22,000 revs!


I have yet to fabricate a bracket to mount the
motor in the “Duct” but as you can see it basicaly
fell together, just drill a few holes in some Stainless Steel tube and Vioal!
A home brew Ducted Fan,
the stainless came from the inside of a “Thermal Cup”
and is quite lightweight and a perfect fit to the Turbo Inlet.
(just dumb luck!)

The motor in the pix is also rare for other reasons,
it is a single transfer port bore which were discontinued early on cos
they only pulled a measly 10,000 to 12,000 to revs!
The more common one comes
with 2 transfer ports and “Slit Exhausts” they pulled from 15,000 to
17,000 revs!
And the Venom’s piston was lightened, polished crankshaft, they had
extra ports and had higher compression
they were capable of 22,000 revs

The Idea is use a drill to start the Cox motor then plug the Cox into
the turbo’s inlet to start the Turbo Jet!
Cool huh?

BTW,
Ducted Fans actually qualify as a Jet by themself and are also known as Cold Jet’s ,
Motor Jets or (my personal favorite) Piston Jets!

cheers, Mick. ‘-))


Lord,
if you can’t make me a better Boy,
don’t worry about it,
I’m having a great time as it is!