Wow, for about $40 US, that's a really neat way to get attitude
information. Thanks for that.
But it looks like you would have to do some processing of that data on
board. Looks like the device is for aircraft keeping the horizon in the
same place, but for rockets wouldn't the horizon be falling away in all
directions? To stay vertical, you would have to ensure the horizon was
falling away at the same rate on all sides.
Mike Ross
On 12/24/18 1:30 PM, David Summers wrote:
Very cool!
On Mon, Dec 24, 2018, 1:28 PM Monroe L. King Jr. <monroe@xxxxxxxxxxxxxxxxxx <mailto:monroe@xxxxxxxxxxxxxxxxxx> wrote:
I'll add one more thing active guidance is very easy with infrared
detection. This stupid simple device is all you really need if
straight
up is what you want.
http://www.revolectrix.com/cpd4_description_tab.htm
No gyros no accelerometers no gps no nothing.
Monroe
> -------- Original Message --------
> Subject: [AR] Re: Spin stabilized rocket
> From: David Summers <dvidsum@xxxxxxxxx <mailto:dvidsum@xxxxxxxxx>>
> Date: Mon, December 24, 2018 10:43 am
> To: arocket <arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>>
>
>
> Thanks everybody for your help!
>
> On Dec 24, 2018 11:41 AM, "Monroe L. King Jr."
<monroe@xxxxxxxxxxxxxxxxxx <mailto:monroe@xxxxxxxxxxxxxxxxxx>>
> wrote:
>
> fineness ratio and yeah I thought that might throw someone off but
> actually, you got it anyway.
>
> Cheers
>
> Monroe
>
> > -------- Original Message --------
> > Subject: [AR] Re: Spin stabilized rocket
> > From: David Summers <dvidsum@xxxxxxxxx <mailto:dvidsum@xxxxxxxxx>>
> > Date: Mon, December 24, 2018 9:17 am
> > To: arocket <arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>>
> >
> >
> > "The larger the diameter/fineness the more pronounced it gets."
> >
> > In this you meant just the fineness ratio, right? Because
> > diameter/fineness would technically be diameter squared / length?
> >
> > Just checking that my understanding of the issue isn't backwards!
> >
> > Thanks!
> >
> > -David Summers
> >
> >
> > On Mon, Dec 24, 2018 at 9:45 AM Monroe L. King Jr. <
> > monroe@xxxxxxxxxxxxxxxxxx <mailto:monroe@xxxxxxxxxxxxxxxxxx>>
wrote:
> >
> > > If you've got asymmetrical burning that bad not caused by a
moon burner
> > > or something like that you've got a problem.
> > >
> > > The rocket in question was spinning about 100rpm. Lol and I
mean it
> > > looked like a wet noodle! Right at MaxQ. There is video!
I'll look for
> > > it.
> > >
> > > Of course, you built a stable rocket in the first place
right? How much
> > > fuel if any was left in that motor? Where exactly is the CG
and CP at
> > > MaxQ?
> > >
> > > Because the results look a lot like instability. In fact,
this was what
> > > I thought it was at first.
> > >
> > > Think polar moment of inertia. The larger the
diameter/fineness the more
> > > pronounced it gets.
> > >
> > > Monroe
> > >
> > > > -------- Original Message --------
> > > > Subject: [AR] Re: Spin stabilized rocket
> > > > From: David Summers <dvidsum@xxxxxxxxx
<mailto:dvidsum@xxxxxxxxx>>
> > > > Date: Mon, December 24, 2018 7:02 am
> > > > To: arocket <arocket@xxxxxxxxxxxxx
<mailto:arocket@xxxxxxxxxxxxx>>
> > > >
> > > >
> > > > Any video? ;-)
> > > >
> > > > I'd suppose this is something where you balance it as much as
> possible,
> > > > right? I'd imagine the balance is thrown off during the
burn since
> > > > propellant doesn't burn perfectly symmetrically, for example.
> > > >
> > > > -David Summers
> > > >
> > > >
> > > > On Mon, Dec 24, 2018 at 3:04 AM Monroe L. King Jr. <
> > > > monroe@xxxxxxxxxxxxxxxxxx
<mailto:monroe@xxxxxxxxxxxxxxxxxx>> wrote:
> > > >
> > > > > It needs to be dynamically balanced if it's 2 stages the
first and
> > > > > second need to be balanced together and the second stage
has to
> balance
> > > > > on its own. Dynamic not static!
> > > > >
> > > > > I've seen rockets look like a wet noodle because of spin
> stabilization
> > > > > and unbalance. Also very critical at transonic (MaxQ)
> > > > >
> > > > > Monroe
> > > > >
> > > > > > -------- Original Message --------
> > > > > > Subject: [AR] Spin stabilized rocket
> > > > > > From: David Summers <dvidsum@xxxxxxxxx
<mailto:dvidsum@xxxxxxxxx>>
> > > > > > Date: Sun, December 23, 2018 2:50 pm
> > > > > > To: arocket <arocket@xxxxxxxxxxxxx
<mailto:arocket@xxxxxxxxxxxxx>>
> > > > > >
> > > > > >
> > > > > > A quick question for those of you in the know: what is
the best
> > > > > performance
> > > > > > that you can expect from a spin stabilized rocket. Is it
> conceivable
> > > to
> > > > > > make it beyond 100 km altitude?
> > > > > > Just trying to see what would be possible to achieve
with an
> unguided
> > > > > > rocket.
> > > > >
> > > > >
> > >
> > >