Thanks for the reply Robert I believe I could do that if I drilled down
to the shaft threw the casing and milled a small round flat on the shaft
to reflect the laser.
The turbine it's self is a Inconel alloy and the pump impeller is SS so
that rules out magnetism on those parts.
Other ideas? Criticism welcome as well.
-------- Original Message --------
Subject: [AR] Re: Turbopump prime mover
From: Robert Steinke <robert.steinke@xxxxxxxxx>
Date: Sat, December 05, 2015 2:50 pm
To: arocket@xxxxxxxxxxxxx
Could you use a laser non-contact tachometer? It shines a laser on your
rotating part and counts the number of times a piece of reflective tape
goes by. I can't visualize your setup so maybe this isn't useful because
the problem is you can't see the rotating part, but if you can see it, but
not touch it this would be a solution.
On Sat, Dec 5, 2015 at 5:36 AM, Monroe L. King Jr. <
monroe@xxxxxxxxxxxxxxxxxx> wrote:
Ok I have a cart for the test engine, now I have to visit the local
junkyard for a useful engine I can rebuild. I believe we can make a
setup similar to this https://www.youtube.com/watch?v=vIzAfwPl3a0 to
make changing turbines/pumps out easier I think we will only need 3
different turbochargers S,M,L so we wont need more than 3 adapters.
Once I get the test engine ready I'll take the cart to a muffler shop
and get the exhaust tubing bent for the test stand.
That flow bench is neeto but it wont supply enough air for load testing.
The only problem now is I have to come up with a new way to get turbine
RPM readings. With cold flow I could get the reading of the turbine side
but now that's not going to be possible and the pump will be on the cold
side. Normally they take the readings off the cold side put our pump
will be in the way.
Any ideas on how to get the RPM readings?
To me this looks like the easiest way to get RPM and HP we need to test
pumps.
Comments?
-------- Original Message --------
Subject: [AR] Re: Turbopump prime mover
From: Ed LeBouthillier <codemonky@xxxxxxxxxxxxx>
Date: Thu, December 03, 2015 1:50 pm
To: arocket@xxxxxxxxxxxxx
over
The main reason I don't want to use a combustion/turbine such as the
ones made from turbochargers.
If your using the compressor/turbine you have to go turboshaft and I've
played with one of these combustion/turbines and they are far from
reliable.
Well to get upwards of 30 HP, you're going to need to come
up with something original.
There was a fella by the name of Nye I corresponded with while he was
developing one of the first of these (back in the 90's) and they just
don't run very well nor are they reliable enough.
Probably true.