[NRV Rocketry] Kentland farms update
Thomas Weeks
tweeks at rackspace.com
Mon Aug 15 23:59:01 CDT 2011
On Monday, August 15, 2011 04:50:34 pm Maier.chris wrote:
> 38 mm I - get the cert done dude, and go big or go home :P
>
> Seriously though, I recently underpowered a little Estes model - package
> recommended an A, it flew, but the 5 second ejection charge went off about
> 10 ft AGL...
>
> I promise I'll never make that mistake again
"Go Big or Go home"... and then you tell me a sob story about an underpowered
"A flight" Chris? hehe.. okay man..
Seriously though, I'm looking and an I225 or so. That'll get it up quick
enough, and bring it back home (with a dual chute deploy).
Tweeks
>
> Chris
>
> On Aug 15, 2011, at 3:13 PM, Tweeks <tweeks at rackspace.com> wrote:
> > [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
> >>>>>>
> >>>>>> >
> >>>>>>
> >>>>>> > This email may include confidential information. If you
> >>>>>> received it
> >>>>>
> >>>>> in
> >>>>>
> >>>>>> > error, please delete it.
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> This email may include confidential information. If you received it
> >>>
> >>> in
> >>>
> >>>>>> error, please delete it.
> >>>>
> >>>> This email may include confidential information. If you received it in
> >>>> error, please delete it.
> >>
> >> This email may include confidential information. If you received it in
> >> error, please delete it.
> >
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>
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