[ERPS] Minutes of ERPS #284

2004-06-14 Thread cpwinter
Minutes of ERPS General Meeting #284 03 June 2004 The President called the meeting to order at 8:12 PM. Members present were Rick Eversole, Sean Lynch, Dave Masten, Julie Porter, and Chris Winter. Reports and discussion on agenda items were as follows: DOCUMENTATION - Chris Winter

Re: [ERPS] Re: Tip nozzle paradox

2004-06-14 Thread Ian Woollard
[EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote:[EMAIL PROTECTED] wrote: But there is no apparent reason for that tip velocity to equal the exhaust velocity "v", and I should think the ultimate tip velocity would be very much higher. Sadly not. The fuel of mass 'dm' must have been accelerate

[ERPS] Rocket Ranch Perchlorate tests

2004-06-14 Thread Jerry Durand
Good news... The results came back from the state DTSC lab last Friday. The results were that they found NO DETECTABLE levels in any of the recent samples from our property. For those on the list who haven't been to the Ranch, the "his" below refers to our unfriendly neighbor who told the state

[ERPS] Re: Tip nozzle paradox

2004-06-14 Thread GDNordley
Apologies for not changing the title on my last post on this. <> Okay, in an "ideal" drag=free system, thrust increases with centrifugal force as chamber pressure, etc., increase. The specific kinetic energy of the propellant in the inertial frame must increase as it flows to the tip engines,

[ERPS] Re: ERPS-list Digest, Vol 10, Issue 16

2004-06-14 Thread GDNordley
<< Now from momentum considerations you can show that the tip speed should be equal to the exhaust velocity- in this case ~200 m/s >> I may be missing part of this scenario, but there seems no reason for rotor tip speed to equal exhaust velocity. I would think rotor tip speed would increase un

Re[3]: [ERPS] Re: Multiple engines (was RE: Liquox)

2004-06-14 Thread Hans Ulrich Ammann
John Carmack wrote: JC> I do think that most everyone drastically underestimates the increase in JC> fabrication and operational work that a biprop will bring. A vehicle with the capacity to hover must have the possibility of deep and fine throttling. Realising that with a classic biprop prop