[NRV Rocketry] Kentland farms update
Tweeks
tweeks at rackspace.com
Mon Aug 15 15:13:10 CDT 2011
[Mark, I'm moving this thread over to the NRVR mail list.. ;) ]
This is a useful discussion that me and one of the VAST rocket guys are having
about the maiden flight of my Talon-3, and what I should launch it on (a 29mm
H motor, or my 38mm motor casing with an *I* impulse motor):
http://theweeks.org/rockets/TALON-3/Talon-3_m.JPG
On Monday 15 August 2011, Mark Miller wrote:
> Of course, it's ultimately your call since it's your bird. I just wanted
> you to know that H motors in [your talon-3] rocket are doable. As long as
> it passes RSO muster (as far as motor goes it's normally based on a minimum
> of 5:1 thrust-to-weight ratio) you are literally good to to go.
I'm still learning here.. but I was considering the 5:1 thrust to weight ratio
when asking my question about which motor to use.
My thinkinf was that with a 6lb loaded bird (call it 8 with a 2lb motor) will
need to clear an average thrust of around 176 N.. right? (8lb * 4.4N/lb *
5:1 ) Unless I just punch it with a VMax or the like (really high initial
thrust to get it to stable flight)...
VMax excluded... doesn't that point to an I motor?
> It looks like we will be flying in some type of crop regardless of whether
> it's corn or the remaining silage, so I would suggest either some type of
> tracking device or at the very least an audio beacon to aid in recovery.
Yeah.. I have a 120dB alarm that I've been saving for something like this. :)
Tweeks
> A
> stand of corn like that can swallow a huge rocket and defy you to find it.
>
> Take care,
>
> Mark
>
> On Mon, Aug 15, 2011 at 3:01 PM, Tweeks <tweeks at rackspace.com> wrote:
> > I'm doing ground tests now (getting my sheer pin hardware set up.. making
> > sure
> > I have good charge volumes, good reliability, etc).
> >
> > I'm a little hesitant to go as low as an H in the Talon-3, as it's only
> > rated
> > for I-J.
> >
> > Tweeks
> >
> > On Monday 15 August 2011, Mark Miller wrote:
> > > Tweeks,
> > >
> > > Just running a quick sim in RASAero for a rocket of that general
> > > configuration and weight of 6 lbs, I come up with a bit over 1000' for
> > > an H400 flight and a bit over 1200' for an H399. In I motors Harry has
> > > in stock, there is the I287 @ ~2550', the I297@ ~3000', and the
> > > I350@~3300'. If you choose to go with a 29mm motor, hardware is no
> > > problem since if
> >
> > you
> >
> > > don't want to buy it from Harry right away, you are welcome to borrow
> >
> > what
> >
> > > you need in hardware and/or adapters.
> > >
> > > Now that you have your dual deployment set up, that gives you more
> > > flexibility as far as altitude. Have you had a chance to do some
> > > ground tests to get your charge sizes worked out?
> > >
> > > Take care,
> > >
> > > Mark
> > >
> > > On Mon, Aug 15, 2011 at 12:44 PM, Tweeks <tweeks at rackspace.com> wrote:
> > > > Haven't got all the finishing touches just yet.. but probably around
> > > > 6lbs..
> > > >
> > > > Tweeks
> > > >
> > > > On Monday 15 August 2011, Mark Miller wrote:
> > > > > Hey Tweeks,
> > > > >
> > > > > What is your empty weight on the Talon 3? In other
> > > > > words, ready to fly other than the motor.
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Mark
> > > > >
> > > > >
> > > > >
> > > > > -
> > > > > On Aug 15, 2011 11:49 AM, Tweeks <tweeks at rackspace.com>
> > > > > wrote:
> > > > >
> > > > > You guys recommending a large H over an I on the Talon3?
> > > > >
> > > > > I'm equipped for 38mm (just bought my Pro-38s casings).. and have
> > > > > nothing for
> > > > >
> > > > > 29mm. I'm AM set up for dual deploy...
> > > > >
> > > > >
> > > > >
> > > > > Tweeks
> > > > >
> > > > >
> > > > >
> > > > > On Sunday 14 August 2011, Mark Miller wrote:
> > > > >
> > > > > > Tweeks,
> > > > >
> > > > > >
> > > > >
> > > > > > Harry from The Dragon's Hoard is scheduled to be there both
> >
> > days.
> >
> > > > > Here is
> > > > >
> > > > > > the link to the motor page on his website:
> > > > >
> > > > > > http://www.thedragonshoard.com/motors.php
> > > > >
> > > > > > Don't forget that your Talon 3 should also be able to fly on
> >
> > some
> >
> > > > > of the
> > > > >
> > > > > > higher average impulse H motors as well, like the H399 in the
> > > > > Pro29 series.
> > > > >
> > > > > > If you don't have adapters for 38 to 29mm, you are welcome to
> > > > > borrow one
> > > > >
> > > > > > from me if you like.
> > > > >
> > > > > >
> > > > >
> > > > > > Take care,
> > > > >
> > > > > >
> > > > >
> > > > > > Mark
> > > > >
> > > > > >
> > > > >
> > > > > > On Sun, Aug 14, 2011 at 1:55 AM, Thomas Weeks
> > > > >
> > > > > <tweeksjunk2 at theweeks.org>wrote:
> > > > >
> > > > > > > **
> > > > >
> > > > > > >
> > > > >
> > > > > > > BTW..
> > > > >
> > > > > > >
> > > > >
> > > > > > > Who's the motor vendor? And how do I connect with them?
> > > > > I'm
> > > >
> > > > going
> > > >
> > > > > to need
> > > > >
> > > > > > > some Pro-38 Is.
> > > > >
> > > > > > >
> > > > >
> > > > > > > Tweeks
> > > > >
> > > > > >
> > > > >
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> > > > >
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> > > > >
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