[AR] Re: Turbopump
- From: rclague@xxxxxxxxx
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 15 Oct 2015 17:14:55 +0000
30 horses for 3 kg? Cool. What's it cost?
-R
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Robert Steinke <robert.steinke@xxxxxxxxx>
Sender: arocket-bounce@xxxxxxxxxxxxx
Date: Thu, 15 Oct 2015 10:42:32
To: <arocket@xxxxxxxxxxxxx>
Reply-To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Turbopump
On Wed, Oct 14, 2015 at 3:39 PM, Monroe L. King Jr. <
monroe@xxxxxxxxxxxxxxxxxx> wrote:
So what's the pumps specs? It will take nearly 30 hp to drive just one
of the pumps to full capacity I'm working on so we can run some test on
electric but to go all the way will take a turbine.
Take a look at this page:
http://finedesignrc.com/motorstp.asp
Scroll all of the way to the bottom. The TP100 motor is rated at 23,000
Watts = 30.66 horsepower. It weighs 3 kg and costs $600. I doubt any
amateur effort will beat that with a turbine.
On Thu, Oct 15, 2015 at 9:01 AM, Anthony Graziani <tjgraz11@xxxxxxxxx>
wrote:
Well, assuming about 60% pump efficiency I'll need about 15hp per pump.
That's about 1000psi at 1kg/s flowrate for kerosene. Chamber pressure at
about 700 psi should net at least 100N of thrust.
I think Anthony's estimate for the engine thrust that can be produced with
this size pump is too low. At 700 psi chamber pressure even an amateur
built biprop engine should get above 200 s Isp. That means a flow rate of
1 kg/s would produce a thrust of 200 kgf or ~2000 N. If he is just pumping
fuel and pressure feeding oxidizer then the total flow rate and thrust will
be even higher.
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