Tuesday, October 17, 2017

AeroTech J1600 SU build (not what it sounds like)

There was a recent TRF thread that asked if people save the tubes that motors are packaged in and if they ever built rockets out of them. The answer is, of course, YES! I replied that I had used them on some oddrocs, including my Saturn V SA-666 and SA-667 induction rockets. I also used one such tube (either AeroTech or CTI, I forget) to rebuild a damaged AeroTech Cheetah that I inherited. Perfect match!

Well, that thread planted a mind worm and I have started building a rocket out of them. It used three AeroTech 38mm packing tubes and one 29mm tube. These are larger than the size motor that they hold but, for simplicity, I will refer to them that way.  The lower body used two of the 38mm tubes and the payload section one 38mm and the 29mm. The couplers, nose section shoulder, and 38mm-29mm spacer were made from sectioned CTI tubes. The nose cone is a damaged hand pumped/launched water rocket. It fits in the  29mm perfectly. The initial sims say it will fly nicely on an F15-4 or -6.

Here is the progress to-date:

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The rocket's name reflects the rough equivalent of the four motors that contributed to this build: two H550s, an I357, and an H182. The tool on rocketreviews.com wasn't updated for the H550 or H182, so I winged an estimate.

Saturday, October 14, 2017

Launch Report 2017-10 (MDRA)

Location: Central Sod Farm, ESL-231
Weather: overcast; high 60s; wind 0-5 
Total flights: Today - 6; YTD - 38
Total motors: Today - 11; YTD - 50
Motors by class YTD:  MMX-1; A-6; B-3; C-17; D-3; E-7; F-5; G-6; H-1; I-1

No traffic to-and-fro and great launch weather - not too hot or chilly and almost no wind. The cloud ceiling was low so high flights were impacted...not mine. We were on an alternate field which was covered in mowed grass. Despite a rainy week, the only wet spots were along the central irrigation ditch. My rockets stayed out of it but my left foot didn't.

The flight rate was lively but there were no lines. Got to see Dr. Zooch's prototype Shutte/Carrier stack. And, then there was Tom's N powered rocket!

Lazarus Movie 10 14 2017

Here are my reports:
  1. DG&A Lazarus on an H182-8 - CR@300 - Bright red plume and at-apogee ejection...nice!
  2. Son of Fronkensteen on a G74-6 - After last year's fail, I added a 12" plate to Fronkie's base. This time, it only made one short detour on its way up. See the video in the album linked below. I already have thoughts on next year's version.
  3. THOY Snipe on 3xE9-4 - CR@200 - Slow boost but a good flight.
  4. Fett Boy on an F59-5 - CR@200 - Version 3 flew great. The -5 delay was perfect.
  5. Hat of Death on an F15-0 - Had to fly the Hat as it was intended to fly (as opposed to being on top of Fronkensteen). This was flight #75.
  6. House of Blues Tetrahedron on 4 x A3-4 - It spun wildly end over end. It will fly again at NARHAMS, but on a single motor!
All my photos are [here].

Thursday, October 05, 2017

Launch Report 2017-9 (solo)

Location: My driveway
Weather: overcast; high 70s; wind 0
Total flights: Today - 2 ; YTD - 32
Total motors: Today - 2 ; YTD - 39
Motors by class YTD:  MMX-1; A-2; B-3; C-17; D-3; E-4; F-3; G-5; I-1

My main goal for today was to fly the House of Blues Tetrahedron on a single A10 prior to moving up to four A3's at an organized launch. It is heavy for its size so I decided to risk a launch in my driveway. It flew perfectly straight but its apogee was low enough to ensure a tree-free recovery. Way lower than, say, my Art Applewhite Stealth D3. It did dull the nose a bit as it landed on the street.

About the only other thing that I can fly there is a MicroMaxx saucer. I knew of a loose motor in my range box so I grabbed My Little Cupcake (made from a paper cupcake shell). My MicroMaxx igniter skills are rusty so on my 3rd try I tried something new. I put a drop of hot glue between the leads and the side of the motor, making sure the nozzle itself wasn't plugged. Well, I think I will prep all my MicroMaxxes this way!

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Monday, September 18, 2017

House of Blues Tetrahedron

Here is another quick and dirty build. The body is a cardboard tetrahedron that protected a corner on a new washer/dryer. I gathered three but totally forgot about them. My wife found them mixed with some trash. She is a good rocket girl, well trained to keep an eye out for junk that I can turn into a rocket.

It is less than three inches high so I decided to go with a 13mm mount. The body is a tad heavy but, luckily, I found a 7x13mm motor mount that no longer had a home.

I am thinking about using an A10 on the first flight and then going up to four A3's next.

I fiddled with PaintShop Pro and came up with the panel wraps. I still need to touch up the edges and shoot a clearcoat, but this is basically it (click through if you want to see better views of the individual faces):

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Sunday, September 17, 2017

Fett Boy V3...that was quick

The tube with the backpack, etc. no longer telescopes over the body but there is a couple of inch open area at its base - enough to add a tad of room for the 'chute but not enough for it to stick after ejection. The plush Fett sits on top and is fat enough to wedge in tightly for launch. It is tethered with a section of elastic just in case it shakes free.

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Fett Boy, V3

The other day, I ran across a Boba Fett dog toy that looked perfect for a Fett Boy. Little did I know that I would need one in a couple of days.  I need to work out how it will be attached and how the how to configure the body. I am thinking about stretching the body to give more room for the parachute and ditching the telescoping nose section for a regular shoulder.

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I still need to work on the detailing. Yesterday's launch snuck up on me so I never finished it up.

Saturday, September 16, 2017

Launch Report 2017-8 (NARHAMS)

Location: Old National Pike Park, Mt. Airy
Weather: wind <3, 81 degrees, sunny to partly cloudy
Total flights: Today - 11; YTD - 41
Total motors: Today - 11; YTD - 48
Motors by class YTD:  A-2; B-3; C-19; D-4; E-6; F-7; G-6; I-1


Another near perfect launch day! The weather, most notably the wind, was great. I even ditched the Chute release on a few flights. It was dead calm a lot of the time! The crowd was smallish since there was a competing regional launch at Great Meadow. Night launchers began to arrive at about 4PM so the crowd was building. I look forward to the night launch photos.

Here are my flights, in no particular order:
  1. Upscale Cluster Bomb on a G64-6 - CR@300' - Well, the large 'chute protector snarled the parachute. It would try to open and then would collapse. It fell safely and only damaged one fin.
  2. Centaurus on an F59-6 - CR@200' - Nice flight but there was a nose cone impact. I didn't see the ejection event. One of the side fin spars broke off and was lost. A trip to Hobby Lobby is in order.
  3. Fett Boy on an F59-6 - The delay estimate was way off and it was headed down fast at ejection. It separated and the cone section was lost. I already have a thought about the rebuild. The Fett Boy will fly again.
  4. 2nd Half on a C6-3 - Nice flight.
  5. Estes Majestic on an E16-6 - Nice flight.
  6. Mega Mosquito on an F15-6 - CR@200' - Nice flight.
  7. MRC Iron Man on a D12-5 - Nice flight.
  8. TLP Rapier on an F44-8 - Some major wiggle on the way up, but still successful.
  9. Lime Stiletto on an E12-6 - Nice flight.
  10. AAW 13mm Stealth on an A10-PT - Nice flight.
  11. AAW Stealth D10 on a C6-3 - Nice flight.
My photo album is linked below. Once again, the Flickr album embed script seems funky. You may land on my photostream and will have to navigate backwards.

NARHAMS 9/16/2017