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>
Date: Mon, December 24, 2018 10:43 am
To: arocket <arocket@xxxxxxxxxxxxx>
Thanks everybody for your help!
On Dec 24, 2018 11:41 AM, "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
wrote:
fineness ratio and yeah I thought that might throw someone off but
actually, you got it anyway.
Cheers
Monroe
-------- Original Message --------possible,
Subject: [AR] Re: Spin stabilized rocket
From: David Summers <dvidsum@xxxxxxxxx>
Date: Mon, December 24, 2018 9:17 am
To: arocket <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> 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>
Date: Mon, December 24, 2018 7:02 am
To: arocket <arocket@xxxxxxxxxxxxx>
Any video? ;-)
I'd suppose this is something where you balance it as much as
balanceright? 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> 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
stabilizationon its own. Dynamic not static!
I've seen rockets look like a wet noodle because of spin
conceivableand unbalance. Also very critical at transonic (MaxQ)
Monroe
-------- Original Message --------performance
Subject: [AR] Spin stabilized rocket
From: David Summers <dvidsum@xxxxxxxxx>
Date: Sun, December 23, 2018 2:50 pm
To: arocket <arocket@xxxxxxxxxxxxx>
A quick question for those of you in the know: what is the best
that you can expect from a spin stabilized rocket. Is it
unguidedto
make it beyond 100 km altitude?
Just trying to see what would be possible to achieve with an
rocket.