[AR] Re: hovering rocket vertical position control
- From: Jonathan Goff <jongoff@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 17 Feb 2015 15:18:28 -0700
Yeah, we had one of the Haskel gas boosters. It looks like you can pick
something up on ebay for ~$1500 or less.
http://www.ebay.com/itm/Hydraulics-International30-30-Air-Driven-Gas-Booster-Paintball-Scuba-/371245373173?pt=LH_DefaultDomain_0&hash=item566ff2d6f5
Looks like with that you could get up to 3500psi of air or more with a
reasonable compressor feeding it.
~Jon
On Tue, Feb 17, 2015 at 3:10 PM, Jonathan Goff <jongoff@xxxxxxxxx> wrote:
> I can't remember. I think we had an industrial one. Can't remember what
> flow rate it was designed for.
>
> Jon
> On Feb 17, 2015 2:37 PM, "Lars Osborne" <lars.osborne@xxxxxxxxx> wrote:
>
>> What kind of booster did you use at Masten?
>>
>> There are industrial pressure boosters, which are in the $3000 range,
>> and I found a manually operated one for paintball, which is $700. I am
>> wondering if there is a sweet spot for low flow rate boosters, but
>> automatically reciprocating.
>>
>> Thanks,
>> Lars Osborne
>>
>> On Tue, Feb 17, 2015 at 1:25 PM, Jonathan Goff <jongoff@xxxxxxxxx> wrote:
>>
>>> 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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