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

  • From: Michael Klett <xsive.guy@xxxxxxxxx>
  • To: roc-chat@xxxxxxxxxxxxx
  • Date: Mon, 6 Aug 2012 11:59:39 -0700

I collect tire weights.  I find them on the side of the road and when
I buy new tires I ask for the old weights.

Thanks,
Mike

On Mon, Aug 6, 2012 at 11:33 AM, Ron McGough <rrmagoo7@xxxxxxxxxxx> wrote:
> Brian,
> Just to let you know that modeling clay isn't the best way to weight your
> nose cone. In the heat of the day it can become soft and runny and then
> loose it's cohesion to the inside of the nose cone. It then slams down too
> the base of the cone changing your CG and compromising the ability for a
> stable flight. Don't ask how I know this. I recommend epoxy and lead shot or
> even BB's if you can't get a hold of lead shot.
>
> Ron McGough
>
> ----- Original Message -----
> From: Brian Morilak
> To: roc-chat@xxxxxxxxxxxxx
> Sent: Monday, August 06, 2012 11:17 AM
> Subject: [roc-chat] Re: 18mm and 24mm E, F, and G motors
>
> 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
>>
>

-- 
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