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Search: Posts Made By: Jerry Irvine
Forum: Projects Yesterday, 09:52 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
Trident 2.25, 4, 12

I added Tridents to the web page. It is still a work in progress.

http://v-serv.com/usr/retro.htm

I also made some changes to some Ace kit pages. Please check all...
Forum: Plans & Publications Yesterday, 06:07 AM
Replies: 97
Views: 12,118
Posted By Jerry Irvine
More importantly the wraps are not necessarily...

More importantly the wraps are not necessarily dead!
Forum: For Sale 02-17-2019, 06:24 AM
Replies: 8
Views: 305
Posted By Jerry Irvine
Unless he gets it. :D

Unless he gets it. :D
Forum: Plans & Publications 02-16-2019, 06:53 AM
Replies: 97
Views: 12,118
Posted By Jerry Irvine
I like the Athena. My first one got blown up by...

I like the Athena. My first one got blown up by a prototype AT F10 motor.

Jerry

http://v-serv.com/usr/kits/cathena3.htm
Forum: Plans & Publications 02-15-2019, 12:51 PM
Replies: 4
Views: 198
Posted By Jerry Irvine
Good point. 30g to be mailable, and thus only...

Good point. 30g to be mailable, and thus only 61.1 N-s. The SU F25W is 77.9 N-s. I suspect if you went back to the EJ charts from NAR the total impulse would be 1-2 Standard Deviations below 80 N-s...
Forum: Plans & Publications 02-15-2019, 06:39 AM
Replies: 4
Views: 198
Posted By Jerry Irvine
Here is something you can actually buy...

Here is something you can actually buy today:

http://v-serv.com/usr/kits/fdart.htm

Aerotech has an F67 like (better than) the one in the Enerjet...
Forum: Model Rocket History 02-13-2019, 09:50 PM
Replies: 4
Views: 243
Posted By Jerry Irvine
The people who know don't talk about it. Not...

The people who know don't talk about it. Not many. Less than one hand.
Forum: Projects 02-10-2019, 07:11 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
In practice the current design works and no tubes...

In practice the current design works and no tubes explode. I choose not to overthink it.

But if you are going to overthink it, remember the gasses are compressible so the pressure analysis is not...
Forum: Kit Collecting 02-09-2019, 05:45 PM
Replies: 7
Views: 446
Posted By Jerry Irvine
So, really you had a space force before Trump.

So, really you had a space force before Trump.
Forum: Projects 02-09-2019, 09:29 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
I will put a version of your suggestion into the...

I will put a version of your suggestion into the instructions an an alternate build option.
Forum: Projects 02-09-2019, 08:23 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
With a 1" port lengths we would include...

With a 1" port lengths we would include twelve 1/8 x 1.5" dowels. I will do a prototype. It would simplify gap filing and keep the full flow rate. The front and rear of the dowel could be tapered...
Forum: Projects 02-09-2019, 08:19 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
And sanding. :D

And sanding. :D
Forum: Projects 02-08-2019, 09:41 PM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
1/8" precut dowels are a stock part for us....

1/8" precut dowels are a stock part for us. It would be trivial to include 12 of them per kit.

The 1x32.5 foot version would not pass gas. It would dual deploy all near the top.

Jerry
Forum: Projects 02-08-2019, 09:40 PM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
I would probably remove about half of that.

I would probably remove about half of that.
Forum: Projects 02-08-2019, 08:07 PM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
Two comments. How wide would you make the slots?...

Two comments. How wide would you make the slots? 5/8"? I could provide silk or some other fabric to cover the gap when gluing to maximize slot area while keeping length to a reasonable minimum....
Forum: Projects 02-08-2019, 01:24 PM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
Correct. Maximum flow and minimal filleting. I am...

Correct. Maximum flow and minimal filleting. I am open to reducing the width from 12/16 to 11/16" if you think it would help that much. But I don't. Keep in mind it almost doesn't matter how much...
Forum: Projects 02-08-2019, 08:17 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
Here is the corrections page for the v0.2...

Here is the corrections page for the v0.2 instructions which could be considered v0.3. The next version will be 1.0 and will ship with the released kit post beta. I still have one remaining beta kit...
Forum: Projects 02-08-2019, 08:00 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
The v0.2 instructions state: 1. Ejection ducting...

The v0.2 instructions state:

1. Ejection ducting cutting. The lower ducts cut into the outside of the BT-22-9 tube should be about 1 long and about wide. Mark the tube for 3 fins to establish...
Forum: Projects 02-08-2019, 07:26 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
The stock config is 3 tubes ejection bypass. The...

The stock config is 3 tubes ejection bypass. The dual deploy is a payload tube, a PP-22-C plate that fits inside the coupler, a screw eye and a screw eye anchor. That is the drogue deploy section...
Forum: Vendors 02-07-2019, 07:10 PM
Replies: 0
Views: 182
Posted By Jerry Irvine
Jan/Feb Sport Rocketry

When I got mine I was dually impressed with its thickness. Then I started leafing through it. Lots of electronics vendors, lots of vendors generally and notably page after page after page of...
Forum: Projects 01-27-2019, 09:30 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
What kind of paper?

What kind of paper?
Forum: Projects 01-26-2019, 08:16 PM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
That's awesome. If you send your real name in...

That's awesome. If you send your real name in email I will credit you of course. info@usrockets.com.

So I guess the 12" Trident pattern might be a bit bigger?
Forum: Projects 01-26-2019, 06:49 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
It always amazes how some people veer widely from...

It always amazes how some people veer widely from the build suggestions. But once you sell a kit it is their property to do with as they want!

I heard a figure once that only 60% of kits are...
Forum: Projects 01-22-2019, 08:59 AM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
One quick post. I only have 1 remaining...

One quick post. I only have 1 remaining prototype Trident 2.25. It will incorporate changes from comments on this thread, so the last 3 altogether will get the updates. After that I will create a...
Forum: Projects 01-20-2019, 12:12 PM
Replies: 96
Views: 4,724
Posted By Jerry Irvine
Merely 6" motor. :) I think it could fly...

Merely 6" motor. :) I think it could fly minimally on a full N. About half the power of this. Or that O.

http://v-serv.com/usr/motors/images.rr152-40960.htm

The strange thing is I have all the...
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