[roc-chat] Re: 18mm and 24mm E, F, and G motors

  • From: Brian Morilak <brian.morilak@xxxxxxxxx>
  • To: roc-chat@xxxxxxxxxxxxx
  • Date: Mon, 6 Aug 2012 11:17:38 -0700

Thanks for all the good sounding advice.  Yeah, I have some modeling clay
left over from a couple other kits that I will pack into the tip of the
nose of the Fatboy.  I'm willing to OC the Bigdaddy without increasing nose
weight because it seems there's a lot of CG margin in stock config.  And
the fins are already pretty dang thick.   I got a pretty robust upgrade kit
for the Fatboy,incl plywood fins and cloth chute but there doesn't seem to
be room for it in the body now, might use it in the bigdaddy instead, or
I'll find a smaller cloth chute.

Oh and I also picked up a Madcow Squat on my 4 hour trip to Yuma...54mm
mount.  I am thinking ahead. :D  Now, to get these dang college loans payed
off BEFORE I go for lv1...



On Sun, Aug 5, 2012 at 6:16 PM, Erik Spjut <spjut@xxxxxxxxx> wrote:

> Hi Brian,
>
> I overclock rockets all of the time. For 18 mm motor mounts I use either
> the single-use D21-7T (or 4T) or the Single-use D10-7W from Aerotech. Jack
> at the ROC launches usually has some D21s, but the D10s have to be ordered
> from ValueRockets or Apogee. I usually use either a Semroc miniAeroDart or
> a Quest Payloader 1, with a PerfectFlite Pnut. I usually get between 1500
> ft and 1600 ft out of them. Be aware that the Aerotechs have a
> far-too-large ejection charge and will rip apart any shock cord you use to
> connect the payload and body section, even on a fairly large rocket.
> Instead, I fly two 'chutes, one on the body, and one on the
> payload/nosecone. I also use an Aerotech Interlock Initiator Clip to
> connect to the copperheads. I've never had one fail with the interlock
> clip. The 18mm rockets are so small and fly so high, that you might want to
> think about just using single-use. I $40 motor casing kind of hurts when
> you lose it.
>
> For 24mm, I have a Quest Superbird that I built with a 24mm mount, instead
> of the stock 18 mm, although anything with a 24mm mount should work OK. I
> also replaced the stock 'chutes with Top Flight thin-mil nylon 'chutes. I
> fly single-use E15-7W, E20-7W, and reload F39-9T. The rocket flies really
> well with apogee (from the Pnut) of about 1800 ft for the E's and 2200 ft
> for the F39. I tried an F32-8T. The rocket survived, but it didn't fly as
> straight as with the other motors. Checking the Pnut output, it hit the
> transonic region, which caused the less-than-perfect flight.
>
> I'd be happy to share other results if you'd like.
>
> Erik
>  On Aug 5, 2012, at 10:33 AM, Brian Morilak wrote:
>
> > Hey rocchat!
> >
> > For the next couple launches I am going to start eeking my away into the
> high(er) power regime and noticed that although all of my rockets have 18mm
> and 24mm mounts, there are various motors out there of these sizes that are
> also F and G.  I am interested in trying out these motors, namely if the
> on-site vendors have them, or if I can order them from some online
> locations. I'd be using them to 'overclock' some proven capable Estes
> models, such as the Bigdaddy and the Fatboy.   Any size recommendations to
> use in a model like this that are known to be 18 or 24mm?
> >
> > -Brian
>
> ----
> Prof. R. Erik Spjut (spyoot rhymes with cute)
> Director, Engineering Clinic
> Union Oil Company Design Fellowship Professor
> Engineering Department, Harvey Mudd College, Claremont, CA 91711
> Office 909-607-3890 Cell 909-367-9085 Fax 909-621-8967 Message
> 909-621-8020
>
>
>
>
> --
> ROC-Chat mailing list
> roc-chat@xxxxxxxxxxxxx
> //www.freelists.org/list/roc-chat
>
>

Other related posts:

  1. Home
  2. roc-chat
  3. Archive
  4. 08-2012