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-   -   Would c6-7 fly a rocket fine that recommends a c6-5? (http://www.oldrocketforum.com/showthread.php?t=7294)

nygiants10 06-30-2010 07:19 PM

Would c6-7 fly a rocket fine that recommends a c6-5?
 
A local hobby shop by me has all their c6-7 engine packs on clearance for 2$ and before buying them all up just wanted to make sure there cool for flying rockets where a c6-5 is recommended.

Royatl 06-30-2010 08:04 PM

The difference between the C6-5 and the C6-7 is, of course, two extra seconds of delay before the parachute is ejected.

If your rocket is usually still going up when it ejects its parachute on a C6-5, you *may* be ok with flying it on a C6-7. If your rocket has slowed down and is just about to tip over or pointed down when it ejects on a C6-5, you *DO NOT* want to fly it on a C6-7.

The C6-7 is for small rockets that will coast a long time. Larger rockets, or heavier rockets, do not take as long to slow down, so they need a shorter delay time.

Pyro Pro 06-30-2010 08:25 PM

What rocket do you want to fly them in?

tbzep 06-30-2010 08:33 PM

Build yourself an Estes Astron Ranger or Astron Cobra clone and fly it on three C6-7's. At $2 a pack, it's a lot more affordable to cluster than it is at the regular $7 a pack. :cool:

The book recommends C6-5's for them, but you can get away with C6-7's on days when it isn't windy.


nygiants10 06-30-2010 08:45 PM

Quote:
Originally Posted by Pyro Pro
What rocket do you want to fly them in?




Photon Disruptor II

Interceptor

Red Star

Saturn 1b 4 motor Cluster

tbzep 06-30-2010 09:02 PM

Quote:
Originally Posted by nygiants10
Photon Disruptor II

Interceptor

Red Star

Saturn 1b 4 motor Cluster


The delay is way too long for the Interceptor and Saturn 1B.

It is marginal at best in the Photon Disruptor II. It is BT-55 based compared to the first one that was BT-50 based. Even the smaller original recommended the C6-5.

The Red Star escapes my mind right now.

LeeR 06-30-2010 09:16 PM

Buy them all, and get into staging. Seriously, I would not pass this deal up.

tbzep 06-30-2010 09:20 PM

So now you have two great reasons to buy up the C6-7's. Clustering and staging. :cool:

BTW, don't forget to get some B6-0 or C6-0 booster motors if you want to try staging.

nygiants10 06-30-2010 09:44 PM

Quote:
Originally Posted by tbzep
So now you have two great reasons to buy up the C6-7's. Clustering and staging. :cool:

BTW, don't forget to get some B6-0 or C6-0 booster motors if you want to try staging.



Ive never really looked into staging but its something im sure ill get into eventually. thanks for all the great info.

tbzep 06-30-2010 10:02 PM

Quote:
Originally Posted by nygiants10
Ive never really looked into staging but its something im sure ill get into eventually. thanks for all the great info.


Then by all means, build a cluster rocket. :cool:

STRMan 06-30-2010 10:28 PM

Quote:
Originally Posted by tbzep
So now you have two great reasons to buy up the C6-7's. Clustering and staging. :cool:

BTW, don't forget to get some B6-0 or C6-0 booster motors if you want to try staging.


Hey, what happened to those A8-0's and A10-0T's we were promised? :(

tbzep 06-30-2010 10:32 PM

Quote:
Originally Posted by STRMan
Hey, what happened to those A8-0's and A10-0T's we were promised? :(


I can only make them one at a time and I don't have a DOT number. ;)

gpoehlein 07-01-2010 02:00 AM

Don't forget photo rockets - the Astrocam 110 recommended the C6-7 simply because the rocket would be pointing down when the ejection went off (and thus, would get a photo of the ground rather than the sky or horizon).

Greg

space_bus 07-01-2010 04:48 AM

Quote:
Originally Posted by STRMan
Hey, what happened to those A8-0's and A10-0T's we were promised? :(
I received the following e-mail response from Estes yesterday after I'd send them a similar question:

"…the engines you noted below are planned for this year, I just can’t give you and exact date when each will be released…but hopefully all will be available by fall. Check the website starting in August or so for more info."

I had asked Estes (via their website's 'Contact Us' form) if they were still planning to re-release any/all of a number of motors I'd heard (on here) they'd been planning to re-lease: A10-0T, A8-0, C11-0, C11-5, and C11-7.

ghrocketman 07-01-2010 09:38 AM

The C6-7 would be a disaster in the Interceptor and the Saturn 1B. At the very LEAST the recovery system would shred as well as if using a kevlar shock-cord leader you would get a zippered body tube also.
Most often you can get away with using a C6-7 when the C6-5 is suggested if the body tube is BT-50 or smaller in diameter, with BT-55 it can be a tossup- something like a Cherokee-D with fairly low drag and light weight would be okay on a C6-7, whereas a heavy and draggy Interceptor most certainly would NOT.
ANYTHING BT-60 or larger will NOT be okay on a C6-7 as a single stage engine EVER; for BT60 and above it better be the upper-stage of a two-stage rocket.

JRThro 07-01-2010 02:14 PM

Quote:
Originally Posted by nygiants10
A local hobby shop by me has all their c6-7 engine packs on clearance for 2$ and before buying them all up just wanted to make sure there cool for flying rockets where a c6-5 is recommended.

They may not be cool for flying your particular rockets, but I'd buy ANY 3-pack of Estes motors for $2 each, whether I had a use for them right now or not.

jeffyjeep 07-01-2010 08:11 PM

Quote:
Originally Posted by nygiants10
Photon Disruptor II

Interceptor

Red Star

Saturn 1b 4 motor Cluster

PLEASE don't fly the 1B or the Interceptor on the c6-7! BTW, we need to see photos of your 1B build BEFORE you destroy it by flying it on (4) c6-7's. :D

ghrocketman 07-02-2010 09:38 AM

You could however fly the Saturn 1B on a cluster of 2xC6-5 and 2xC6-7 though as the ejection charge from the C6-5's will be PLENTY to eject the chute and the -7's just venting to the top of the open tube. This actually would be much easier on the airframe and would be a good way to use C6-7's !

jeffyjeep 07-02-2010 01:49 PM

That's a good idea! I was probably just about to think of that.

DaveR 07-02-2010 04:21 PM

Quote:
Originally Posted by ghrocketman
ANYTHING BT-60 or larger will NOT be okay on a C6-7 as a single stage engine EVER; for BT60 and above it better be the upper-stage of a two-stage rocket.

Come now GH, you of all people....... :D :p
Back in the '80's I'd fly my DRM all the time on a C6-7 with a 24" chute, had a great pucker factor but never failed to recover safely. That said, not too sure I'd do it now..... :o


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