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  #61  
Old 04-04-2021, 10:09 PM
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jeffyjeep jeffyjeep is offline
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Mounting the charge retainers.

Now for some SERIOUS over-engineering!

I painted the 3D printed charge retainers over 2 weeks ago so there's a chance they're dry now.

I want to do a clean mounting of the charge retainers so:

First I slit some thin strips of delicate surface blue painter's tape and lay the charge retainers in place with no adhesive yet. Resting the model across my Herculean thighs I then cut (4) little tape dots with my leather punch and place them on the obverse side of the charge retainer where the adhesive is going to be applied on the reverse side. I then place short strips of tape on either side of each dot and then mark the dot location with a Sharpie.

TBC
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  #62  
Old 04-04-2021, 10:22 PM
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Now with the charge retainer marked with the dots and the model's body marked with the strips and Sharpie lines I use a fresh #11 blade and slit out small squares into the raw paper of the body tube where the adhesive is going to be applied.

I then place a small amount of 15 minute epoxy at each of the (4) locations and then I lay the charge retainer in place using the aforementioned dots and marked strips as my alignment guide.

I then hold the charge retainer in position until the epoxy hardens enough for me t o let go.

I then remove the strips and dots.

See? I told you I over-engineered this!

My brain hurts. I'll do the other charge retainer tomorrow.

Wench! Wench! Where's my Scotch?! Good night.

TBC
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  #63  
Old 04-04-2021, 11:23 PM
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How much does this beast weigh without motor ?
Sounds like a small "H" would be needed for a decent flight.
Is it 29mm or 38mm ?
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  #64  
Old 04-05-2021, 06:54 AM
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It's 29mm and with the (2) 30" parachutes added it weighs 29 oz.
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  #65  
Old 04-05-2021, 08:12 PM
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A G64, G78, or G80 should work.
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  #66  
Old 04-05-2021, 08:44 PM
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Sounds good. I'm still not sure about how much canopy is needed. I have (2) Rocketchutes 30" nylon chutes for the model. The instructions call for (2) 36" parachutes, but 2035.75 inches of canopy seems like an awful lot of canopy. To me, anyway.
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  #67  
Old 04-05-2021, 09:05 PM
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Quote:
Originally Posted by jeffyjeep
Sounds good. I'm still not sure about how much canopy is needed. I have (2) Rocketchutes 30" nylon chutes for the model. The instructions call for (2) 36" parachutes, but 2035.75 inches of canopy seems like an awful lot of canopy. To me, anyway.


I would assume the body and nose recover separately? If not, I would make it so. Would not want those two large pieces clanging together on the way down.

As to canopy area, do the two pieces way weigh about equal parts? Or, thereabouts? If they are roughly the same weight, then basically a pound under each 30” canopy (or even 36” canopy) is not a bad distribution. One wouldn’t be flying in a gale force wind, so those parts are not going to drift too very far under chute(s) that size.

The Centuri and Estes Saturn V lower segments both recovered under twin 24” chutes, and while twin chutes loose a bit of their overall drag potential when blossomed side by side, the lower portion of those Saturn Vs only weighed maybe half a pound, and they would tend to recover fairly rapidly under those two 24” chutes.

Earl
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  #68  
Old 04-06-2021, 08:50 AM
BARGeezer BARGeezer is offline
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Quote:
Originally Posted by jeffyjeep
Sounds good. I'm still not sure about how much canopy is needed. I have (2) Rocketchutes 30" nylon chutes for the model. The instructions call for (2) 36" parachutes, but 2035.75 inches of canopy seems like an awful lot of canopy. To me, anyway.

I think you'll be good with the two 30" chutes.
I used the descent rate calculator at Payload Bay and it says that ONE 36" chute for that weight rocket is enough (15 fps descent rate IIRC).
Separate chutes is not a bad idea. Or a really long shock cord.
Nice job on the finish.
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  #69  
Old 04-06-2021, 09:56 AM
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If you don't have a big field and need to keep it safe, take a look at the F52 Blue Thunder 29mm Hobby Line Reload.

I've used these on 4" NCR by Estes Patriot Rockets with no problem.

If you are flying from a large field, then disregard.
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  #70  
Old 04-06-2021, 01:19 PM
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Today, I'll shoot the dull coat.

Humidity is 32%. Wind is cooperating. No bugs.

STAND BY!

If you read this obituary then you'll know that I screwed up the dull coat: Jeffrey Smith (USN) of Aurora, Illinois (home of Wayne and Garth) hanged himself today with Duluth Trading Company boxer-briefs. He's survived by an extremely pi$$ed-off wife, (2) stupid cats, and (1) yappity mutt.

TBC
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