My SBR box won't be mailed for about a week or so.Came home to this! Should be a great build and I have some fun ideas for this one.View attachment 424112
You’re a good dad, Tim.This isn't the normal doing something rocket-wise but it's pivotal to me...
Last night I made great progress in sparking my 12th-grade son's interest in rocketry (will be very helpful in my starting to fly HPR again). I casually left open an old spreadsheet that I was using to scale down the 3-round Javelin III flight outlined in an old issue of HPR. Something wasn't adding up, and I had put question marks there to remind myself the numbers needed to be reviewed. That's bait for a math geek. A little later he said he saw I had question marks on a spreadsheet, and asked me what I was trying to do.
I explained what it was and found an opening in the discussion to get to grain geometry, brought out a G75 grain and showed him the slot, how it would change during burn, how that would influence chamber pressure, and BAM! Fish on! After a brief back and forth over that, we went to other grain geometries, looked at some thrust curves, and he declared the velocity/altitude curves generated by the old wRASP simulator to be "beautiful". After finding a couple of launch videos to illustrate, he asked if we would be able to "get in" to a launch. I said not only will we get in, we'll be flying a rocket, too!
Whew! The last time I tried flying, he was about 5. The noise, the people, the non-routine situation was too much for an Asperger's child. It just didn't work, he was miserable. I knew my HPR days were done for a while. Fingers are crossed that we'll be in Nashville in November!
Well, my friends, it's official: I suck.
Build thread? (please? )Came home to this! Should be a great build and I have some fun ideas for this one.
Although I would point out that my Big Daddy on a G80 worked, well mostly....If you suck, so does Jim Jarvis, Steve Shannon, and every other rocketeer (myself included) who've had a bad day.
There'll be better days at the field. This one was depressing, but i believe you'll have better luck in the future
I’m not laughing at you, I’m laughing with you.I prepped my Solar Flare (modded for an 18 mm sustainer engine) with a C6-0 and A8-3. The RSO was happy and I got my pad assignment. All seemed well until I tried to place it on the rod and discovered that I'd never attached the launch lug.
I don't know. Could be a trap. Lure you in with a mowed field. Can't be too careful these days. Those trees on the right look hungry. (just kidding)I went for a walk.....
With the COVID and work at home, I stopped getting exercise walking to meeting, labs, etc - and started gaining weight (over 10 pounds).
I finally decided I needed to take time and start walking. And my walks got longer. And I decided to try different routes for variety. One new route is fairly long, so I don't do it often. I did notice a large field and thought "that would be great for flying". The other day when walking I saw a gentleman mowing the field. I flagged him down and started a conversation:
Me: How are you doing? Is this your land?
Him: Yes
Me: This may be a bit bold, but as a hobby I build and fly model rockets. I was wondering if I may be able to occasionally use your field for a launch
Him: Sure - just make sure you clean up any mess and don't fly when its too dry
Me: THANK YOU!
View attachment 424293
This is exactly what I do most of the time. One caveat: in step three, it is hard to avoid getting some glue on the motor mount tube. If the fins will be TTW, you have to be careful, lest you end up with glue bumps blocking the fin root from setting properly.What works nicely for LP is probably adaptable here.
- Use a long stick to apply a ring of glue where the forward centering ring will go.
- Insert the motor mount assembly part way and canted.
- Use the stick to apply a ring of glue where the aft ring will go.
- Insert the motor mount assembly all the way
I do this too but I mark the stick with a sharpie so I know how far in it should go before spreading the glue.What works nicely for LP is probably adaptable here.
View attachment 424313
- Use a long stick to apply a ring of glue where the forward centering ring will go.
- Insert the motor mount assembly part way and canted.
- Use the stick to apply a ring of glue where the aft ring will go.
- Insert the motor mount assembly all the way.
We've all been there Joe!
No launch lugs! I remember having to CA a set of lugs in place on the field in the same situation!!!
Same here, it works.This is exactly what I do most of the time. One caveat: in step three, it is hard to avoid getting some glue on the motor mount tube. If the fins will be TTW, you have to be careful, lest you end up with glue bumps blocking the fin root from setting properly.
Very nice!
Considered but rejected.No teeth marks?
Do it for Skywriter II.Considered but rejected.
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