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Min Diameter builds. 38mm and 54mm
#11
All that pic tells me is that the cones really suck at holding paint!
Dan Patell
TRA 10904 L3
Patell Manufacturing Facebook Page
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#12
(08-09-2015, 09:03 PM)patelldp Wrote: All that pic tells me is that the cones really suck at holding paint!

Good thing I'm not painting it, lol. But seriously, that pic tells me that the bare nose cone will stand up to Mach 2+. Open Rocket tells me a max velocity of Mach 1.89.

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
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#13
Guys I have had an extended Punisher out to Mach 2.27 and the nose cone looks like the day it arrived.
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#14
Got mylar in the mail earlier this week. Still waiting on peel ply.

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
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#15
Peel ply is in. 54mm Build starts soon. Stay tuned...

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
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#16
Well I ordered some proline 4100 epoxy from Rocketry Warehouse a couple weeks back. Never received shipping conformation. I emailed Friday and got a reply today saying they were temporarily closed and they had a notice on their website. Upon further inspection, I ordered the same day they closed... Just my luck as the 38mm carbon version is supposed to fly in a drag race on the 12th, and Rocketry Warehouse will ship my order on the 10th. So as a solution I decided to fin the nearest hardware store that was open today and carries West Systems 105 and 205. Hour and a half trip later and almost $200 lighter (they didn't have and smaller sets) this build will finally happen when I have free time tomorrow.

Now the original version of the 38mm rocket had about two weeks of planning and one week of building before I finally put a motor under it and lit the fuse (metaphorical fuse of course). The new version has about 10 months of planning and will also have about one week of building.

The build checklist so far:
-Make tube out of carbon fiber.......................................X
-Cut tube to correct length..........................................X
-Cut fins............................................................X
-Bevel fins..........................................................X
-Tack on fins........................................................X
-Fin fillets.........................................................X
-Secure ac-bay.......................................................X
-Tracking Bay solution...............................................X
-Mount recovery......................................................X
-Motor retention (will likely be friction fit).......................X

I have everything planned out about how everything will be fit together and the final projected length of the launch vehicle is 27.25" with a weight of around 12-14 ounces with all recovery and electronics installed. The rocket is designed to be stable with an I216 (static stability 1.91 calibers per OR) and according to OR will become more stable as the motor burns, topping out at 3.5 calibers at motor burnout. It's first flight will be an H143 with a static stability of 1.78 calibers and 3.9 calibers at burnout. Oh yeah, the H143 is predicted to break 7,000 feet and the I216 is predicted to break 15,000 feet.

BTW, does anyone know how posting photos work? I can't seem to do it properly and I'm sure you all want to see WIP, final build, and flight photos.

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
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#17
For attaching pics:

Start a New Reply, scroll down to attachments, use the browse and insert, then click add attachment.

Or if you are linking from a photo hosting site, use the insert image button just above the message window (hover over it and it should say insert an image)
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#18
(09-07-2015, 12:33 PM)MarkH Wrote: For attaching pics:

Start a New Reply, scroll down to attachments, use the browse and insert, then click add attachment.

Or if you are linking from a photo hosting site, use the insert image button just above the message window (hover over it and it should say insert an image)

I've tried doing the add attachments method and it worked the first time. Every time after that it won't let me add the image to my attachments...

Ok, so building has officially started today!

I have made the fins and beveled them. Also today, I spent about six hours over at a friends house learning how to make tubes.

We started with a 29mm fiberglass tube so I could get the hang of it. The end result was a tube that has one end much thicker than the other and is basically a throw away tube.

   

Then we bumped up to the 54mm tube that I will be using as the body tube for the 54mm MD build. Three layers of glass and a much nicer tube than the previous attempt with the 29mm, and I have the body of that bird. Weight : 178g, Length: 26.5"

   

Before we decided to dive into the carbon fiber, we decided one more practice fiberglass tube was in order. This time in 38mm. I'll probably end up using this tube as a motor mount at some point. Weight: 99g, Length: 20.5"

   

Now that we were confident we wouldn't screw up the carbon fiber, we made that tube. 38mm (1.5") ID, 39.6mm (1.562") OD. Unfortunately the tube is stuck on the mandrel, I'm currently trying to figure out ways to take it off. Also shown are the three fins I made this morning.

   

(pics finally decided to post correctly)

Checklist:
-Make tube out of carbon fiber.......................................√
-Remove tube from mandrel............................................X
-Cut tube to correct length..........................................X
-Cut fins............................................................√
-Bevel fins..........................................................√
-Tack on fins........................................................X
-Fin fillets.........................................................X
-Secure av-bay.......................................................X
-Tracking Bay solution...............................................X
-Mount recovery......................................................X
-Motor retention (will likely be friction fit).......................X

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
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#19
So after an epic day of building (didn't have work today), I find out the guy I'm drag racing won't be at the launch tomorrow. BUT that didn't stop me from finishing the rocket.

So without further ado, I present MD-38 SkuPunch II:

   
(I don't know why it's rotated)

Weight: 8.8oz (sans radio tracker)
Length: 28.75"

Overall I'm extremely happy with how this turned out. The rocket is lighter than I expected. When I go for the 15,000' shot I'm going to have to put nose weight into it to get it heavy enough for optimal weight (around 12-14oz). But for tomorrow, I'm going to fly it on a 1-grain G46 classic. Expected altitude: 4,700' (per Open Rocket).

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)
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#20
Thanks for sharing!


Bill Clune L3 | NAR#88583
Been a launch Director
Founded a Club
MARS Club|SRC|MDRA - Forever
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