dpower
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- Jan 18, 2009
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Fellow Semroc Fans,
This was supposed to be ready for NARAM-54, for entry in the classic model competition. Well, it didn't get done in time, and I couldn't make it, but at least it was completed before years end!
This is a 1.55x upscale of the classic Semroc Hydra VII, that started with parts purchased in the 2011 SAM Christmas sale. I've attached a photo of the completed bird, next to its original Semroc kit build. The original has flown many times on 7 motors. Since I didn't enter this in competition, I was free to use only 9 finlets instead of 12, which I prefer the look of, and free to paint it matching current cover art. Otherwise it is a very close scale build, varying from 1.52x to 1.58x, IIRC, with a height of 47.5"
This is my original, which I built during Heart surgery recovery:
https://www.rocketryforumarchive.com/showthread.php?t=25439
The goal of my upscale was to be as large as I could fly on 7 BP 24mm motors, attain reasonable altitude, yet be small enough to still be a "Model Rocket", for entry in competition. Since we now have C11, D12, E9, and E12 motors, this gave me a fair amount of flexibility.
It was built with primarily Semroc parts, which was another goal of mine, since this is an original Semroc design. ST-9 motor tubes, centered within ST-11, BC-1122 small cones, and a BNC-80HVE large NC. The NCs are all upscales of the original, and the ring is LOC 5.5" tubing.
Final weight, balanced for a max 7xE9 load, is 42oz; With a combo of C11 & D12 motors, it just squeaks under the 1500g limit, and 125g propellant limit. The NC has an adjustable weight system, so I could remove another 2-3oz for smaller motors if needed.
I'll attach a few more pics in a subsequent post, showing a few construction details. I was going to document the entire build, but kind of lost steam. The finishing touches were decals by Stickershock.
I'd like to thank Carl for this fantastic design, shown in the 1970 catalog: https://www.ninfinger.org/rockets/catalogs/semroc570/570semroc12.html
This was supposed to be ready for NARAM-54, for entry in the classic model competition. Well, it didn't get done in time, and I couldn't make it, but at least it was completed before years end!
This is a 1.55x upscale of the classic Semroc Hydra VII, that started with parts purchased in the 2011 SAM Christmas sale. I've attached a photo of the completed bird, next to its original Semroc kit build. The original has flown many times on 7 motors. Since I didn't enter this in competition, I was free to use only 9 finlets instead of 12, which I prefer the look of, and free to paint it matching current cover art. Otherwise it is a very close scale build, varying from 1.52x to 1.58x, IIRC, with a height of 47.5"
This is my original, which I built during Heart surgery recovery:
https://www.rocketryforumarchive.com/showthread.php?t=25439
The goal of my upscale was to be as large as I could fly on 7 BP 24mm motors, attain reasonable altitude, yet be small enough to still be a "Model Rocket", for entry in competition. Since we now have C11, D12, E9, and E12 motors, this gave me a fair amount of flexibility.
It was built with primarily Semroc parts, which was another goal of mine, since this is an original Semroc design. ST-9 motor tubes, centered within ST-11, BC-1122 small cones, and a BNC-80HVE large NC. The NCs are all upscales of the original, and the ring is LOC 5.5" tubing.
Final weight, balanced for a max 7xE9 load, is 42oz; With a combo of C11 & D12 motors, it just squeaks under the 1500g limit, and 125g propellant limit. The NC has an adjustable weight system, so I could remove another 2-3oz for smaller motors if needed.
I'll attach a few more pics in a subsequent post, showing a few construction details. I was going to document the entire build, but kind of lost steam. The finishing touches were decals by Stickershock.
I'd like to thank Carl for this fantastic design, shown in the 1970 catalog: https://www.ninfinger.org/rockets/catalogs/semroc570/570semroc12.html