[AR] Re: hovering rocket vertical position control
- From: Jonathan Goff <jongoff@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 17 Feb 2015 14:25:25 -0700
George,
If you're doing that, and want more than a few seconds of flight, you'll
likely need to go to higher pressures than a normal air compressor can go
to... But there are those differential piston gas pumps we used at Masten
to take low pressure helium and boost it back up to enough pressure to
refill a T-bottle.
~Jon
On Tue, Feb 17, 2015 at 12:35 PM, George Herbert <george.herbert@xxxxxxxxx>
wrote:
> For (very) short flights, compressed air rockets using COTS tanks (like,
> standard propane bottles) give you more rocket-like behavior and are still
> darn cheap. Air compressor, tank, compressed air "throttle" valve,
> whatever thrust vector you want to employ.
>
> They even really are a rocket - it's just rare to see cold gas thrusters
> these days.
>
>
> George William Herbert
> Sent from my iPhone
>
> > On Feb 17, 2015, at 9:26 AM, Nate Vack <njvack@xxxxxxxxxxxxxxxx> wrote:
> >
> >> On Mon, Feb 16, 2015 at 5:18 PM, <rsteinke@xxxxxxxxxxx> wrote:
> >>
> >> What have other people done? Are there other ideas?
> >
> > If you're looking to actually build a thing and test your stuff, you
> > might do well with model rotorcraft; IIRC, Paul Breed tested a lot
> > with helicopters. Quadrotors could reasonably approximate multi-engine
> > rockets, and you could probably build a single ducted-fan design that
> > would hover, too.
> >
> > Moving to actual rocket hardware will still involve some surprises, of
> > course. But crashing a $500 model is... cheaper than crashing a
> > rocket.
> >
> > -n
> >
>
>
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