#1
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Fin fillets for the Semroc Omega
The Semroc incarnation of the Omega features through-the-wall fins. But the tabs do not reach the motor mount tube. Furthermore, unlike most other kits with TTW fins, the motor mount is installed after the fins are attached. The aft centering ring butts against the rear edges of the fin tabs.
My question is: the instructions do not mention this, but is there any reason to not fillet the joints between the fin tabs and the inside of the body tubes? That would seem like a good thing to do, especially for the booster when flying with an E12-0. Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#2
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"Slightly through the wall" fins were common at one point.
I always used internal fillets. I don't see a reason not too unless they interfere with fitting some part or another. (e.g., the Hawk Hobby Bandit upscale had tabbed fins; the fillets had to be kept neat and small so that the slotted rings of the interchangeable motor mounts would fit.)
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NAR #27085 - Oregon Rocketry - SAM |
#3
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Bill,
Why not add some same-thickness balsa strips to the fin tabs and sand until the strips touch the motor tube and the fin is flush with the tube. Then fillet at the motor tube, the strip/tab joint, and the tube. Another trick I use is thin spruce on the trailing edge of swept fins to help prevent dings. No one knows the mod. How about launch tomorrow.... Chas
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Charles Russell, MSgt,USAF (ret.) NAR 9790, Lvl 1 SAM "Balls Three" |
#4
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Maybe it has something to do with "concerns" over the Booster "vents" getting clogged....I really have no clue...maybe Carl knows...
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#5
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Quote:
A lot of current Estes kits are that way. Quote:
The front centering rings are slotted to clear the tabs. If there was any interference, I can enlarge the slots a bit. Now that you mention it, the Semroc SLS Laser-X is the same way with its interchangeable mounts. Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#6
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Quote:
I am not concerned about the tabs not gluing to the motor mount tube. I was just wondering whether there was an obvious reason for not doing the "free" strengthening with internal fillets. Quote:
Planning on it...you? Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
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