PDA

View Full Version : Black Sunday - part II


A Fish Named Wallyum
07-10-2005, 09:42 PM
Once the sun was low enough in the sky it was beautiful weather for a launch. (Well, better than Craig was having.) It was still hot, but not blazing as it had been when I was out painting the garage earlier in the day. (YUCK!!!!) Once again, I had to wait for baseballers to clear the field, but that gave me time to fill up the wifes car. The baseball team was clearing out when I came back, so I took over the field. First on the pad was the Excelsior Goonybird Zero on a B6-4. Great flight, but another early ejection that luckily caused no damage. The sound drew a group of kids, all of them from my kids class at school. They became my launch and recovery crew, both jobs that I'm always happy to relinquish.
Flight #2 was my MPC Nike Patriot on a B6-4. This was a very cool flight with a visible flame all the way up and a true 4 second ejection charge. Austin Rosenhagen ran it down like a fly ball and caught it before it hit the ground. Pretty impressive. I wish I had his energy.
Flight #3 was the Estes Big Dawg on a B6-4 minus 2. Another early ejection, but also another great catch by Austin.
Flight #4 was the Holverson Wicked Winnie. Pretty decent air for a big rocket and the kids freaked when the chute didn't immediately open, but that was by design as I had wrapped the shock cord around the chute to let it drop below tree level before it opened. (Wish I'd have done that more often.) Still broke a fin on landing, but at least it will fly again.
Flight #5 was an old Estes Mini Bomarc that I rescued from Ebay. An A3-4T flight with nice flame in the twilight. Very cool and Austin was there to catch it again.
Flight #6 was the Semroc Taurus, which the kids were all impressed with. Impressive flight on a B6-4. The flames were now clearly visible with each flight and the Taurus was especiall cool.
This was where things started to go bad. Flight #7 was the Goonybird Zero again on a B6-4. It kicked to the right off the pad and was obviously in trouble from the moment it ejected. It wound up sixty feet up in the same tree that devoured my Centuri Scram Jet four years ago. They can exchange war stories now.
Flight #8 was a command performance for the Semroc Taurus. Another impressive flight in the twilight, but this time the B6-4 ejection charge blew the whole side out of the rocket at the bottom transition. Found both pieces, but I think its career is done. (See pics and you'll understand why.)
Flight #9 was the Estes Solar Sailer II that I bought off Ebay in 2001, but only recently finished. Awesome flight on a B6-4 because now the shadows were creeping in and the flame was very bright. Coo-l, if I do say so myself.
Flight #10 was the MPC Nike Patriot again. This time it wound up skirting through the leaves and just missing a tree berth with the Goony. Living lucky on a B6-4.
This was where my luck ran out. I gave the Big Dawg another shot because Taylor, Austin's twin sister who was one of my Brownies years ago, wanted to launch one. The Dawg was gone as soon as it left the pad. It wound up in a tree in a neighborhood on the other side of the field. I should have cut my losses and quit, but Turtle wanted to launch one.
The final flight of the night, #12, was the Solar Sailer II again on a B6-4. This was another impressive, fiery flight, but things went bad immediately at ejection. It started drifting and wound up in the tree next to the Goony. Atleast they'll be able to keep each other company later this week when the hurricane remnants blow through.

So, for the day, 12 flights, one destroyed, one damaged and three lost. Still a hell of a lot more fun than painting. :D

Vanel
07-10-2005, 10:41 PM
Bill,

Oh man, that Taurus looks like it is in major pain :eek:

Sorry about your losses - I sympathize. I have noticed that even if there is only one tree in a very large field, my rockets will be drawn into it. As a result, I only launch in areas where there are no trees. Fortunately, there is a big field near my place that is perfect for LPR - until the cotton starts to grow.

Even with your losses, it sounds like you had a good time... Still, I have one question:

Can I borrow your recovery crew? ;)

A Fish Named Wallyum
07-10-2005, 10:55 PM
Even with your losses, it sounds like you had a good time... Still, I have one question:

Can I borrow your recovery crew? ;)

Yeah, a bad day launching beats a good day of home improvement anytime.

As for the recovery crew, I know the parents, and I'm sure they'd entertain offers. :rolleyes: You'd have to feed Kody, though. That doesn't leave much in the way of motor money.

CPMcGraw
07-11-2005, 12:44 PM
Once the sun was low enough in the sky it was beautiful weather for a launch. (Well, better than Craig was having.)

Looks like those over-zealous deployment charges found a weakness in your transition. It also looks like the parachute might have jammed in the tube, too. Had that happen on a Quest Gamma-Ray. Loud pop when the motor blew out...

You didn't use a liner tube? The damage doesn't really look irrepairable -- biggest challenge is removing the remains of the shoulders out of the tubes without damaging them any more.

The careful application of a Dremel with a fine grinding stone should do the trick...

I'd suggest using a piece of ST-5 the same length as the transition and shoulders as your pressure ducting when you rebuilt. If you look at the end of an 18mm motor, that's about all the inside area the casing allows anyway.

Make a core-cutting tool out of a piece of brass tubing the same size or a fraction larger than a piece of ST-5 (or BT-5), with the inside edge ground to a sharp taper. Use a drill of a matching diameter to the inside of the tubing to remove the excess from the center of the core, pushing the brass tubing along as you go. Sort of a make-shift round mortising tool. When you remove the brass tube, glue in a piece of ST-5, and you now have a stiffening backbone through that transition. The tubing will take the stress of ejection better.

Dennis is about to make your week a bit soggy, from what I'm seeing on TWC. Atlanta seems to be underwater, and it wasn't even in the direct path. Mobile came out with mostly downed power lines and maybe some broken tree limbs, but not much more.

Craig

Doug Sams
07-11-2005, 12:52 PM
for the day, 12 flights, one destroyed, one damaged and three lost. Still a hell of a lot more fun than painting.Bill, I'm glad you can take it that well. I'd be mighty bummed about the losses. I've been known sneak out with a saw, too :)

While the Taurus is hurting, it looks repairable. You might have to make some mod's - ie, cut the broken ends back to fresh material then build a new transition - but it looks like you can build a Taurus-lite out of it without having to completely overhaul it. BTW, what caused it to let go? Did you do a post mortem? Overly hot ejection charges?

At least the broken fin wasn't on your favorite rocket :)

Doug

Doug Sams
07-11-2005, 01:11 PM
Looks like those over-zealous deployment charges found a weakness in your transition. It also looks like the parachute might have jammed in the tube, too.I was wondering about that. The forward section looks kinda small (when the base of the nosecone is considered). I guess that means the chute has to be pushed all the way down into the narrower middle tube?

BTW, Glad to hear/see you're OK.

Doug

Eagle3
07-11-2005, 07:24 PM
Bill, I kept my transition solid and put the chute in the main lower BT. There's plenty of room for a good sized chute and protection FWIW.

A Fish Named Wallyum
07-11-2005, 08:09 PM
Bill, I kept my transition solid and put the chute in the main lower BT. There's plenty of room for a good sized chute and protection FWIW.

That's what I'll do with the next one. I just wanted to do something a little different.
I'm also going back to the white pods and rounded cones. ;)

CPMcGraw
07-12-2005, 11:22 AM
BTW, Glad to hear/see you're OK. Doug

The most-often-used phrase by all of the administrators and EOC people down here in Mobile and Baldwin Counties has been "We dodged a bullet". It's the folks farther north of us that are feeling the hurt, with all the rain that's getting dumped...

Craig...

CPMcGraw
07-12-2005, 11:32 AM
Bill,

Didn't ask this, but were you using traditional recovery wadding sheets, or the shredded newsprint?

My Gamma Ray had the shredded stuff, and it plugged itself very tight on the aforementioned flight...

Took quite a bit of prodding and poking to work it loose...

Gotta stop feedin' em so much cheese... :eek:

Craig...

Doug Sams
07-12-2005, 12:19 PM
I just wanted to do something a little different.I forgot you hollowed them out. If you want to do something like that again, take some kraft paper (ie, paper grocery sacks) and cut it into ~3/8" wide strips. Glue them to the inside walls of the hollowed transitions extending into to attached tube, overlapping one strip with the next. This will really beef up that section without adding lots of weight. By being in strips, they won't tighten and lift when the (yellow) glue shrinks.

I made this rocket's long transition from card stock, then lined it with kraft bits. It's hard as a rock, or "quite sturdy" as they might say across the pond :)

http://home.flash.net/~samily/toyrocket/

Dope and tissue might be another option, but again, I'd go with strips to avoid shrinkage problems :)

Doug
Lessee what Bill does with that straight line :)

A Fish Named Wallyum
07-12-2005, 07:45 PM
Looks like those over-zealous deployment charges found a weakness in your transition. It also looks like the parachute might have jammed in the tube, too. Had that happen on a Quest Gamma-Ray. Loud pop when the motor blew out...

You didn't use a liner tube? The damage doesn't really look irrepairable -- biggest challenge is removing the remains of the shoulders out of the tubes without damaging them any more.

The careful application of a Dremel with a fine grinding stone should do the trick...

I'd suggest using a piece of ST-5 the same length as the transition and shoulders as your pressure ducting when you rebuilt. If you look at the end of an 18mm motor, that's about all the inside area the casing allows anyway.

Make a core-cutting tool out of a piece of brass tubing the same size or a fraction larger than a piece of ST-5 (or BT-5), with the inside edge ground to a sharp taper. Use a drill of a matching diameter to the inside of the tubing to remove the excess from the center of the core, pushing the brass tubing along as you go. Sort of a make-shift round mortising tool. When you remove the brass tube, glue in a piece of ST-5, and you now have a stiffening backbone through that transition. The tubing will take the stress of ejection better.

Dennis is about to make your week a bit soggy, from what I'm seeing on TWC. Atlanta seems to be underwater, and it wasn't even in the direct path. Mobile came out with mostly downed power lines and maybe some broken tree limbs, but not much more.

Craig

I think you're right about finding the weak spot in the transition, but the parachute was rolled tightly enough that it would fall out. I also used minimal dog barph.

I'm sure I'll try some sort of rebuild, but I think I'll just opt for using the lower section as both power and recovery.

As for Dennis, we've only had light drizzle for the past two days. He might be around for the weekend though.

A Fish Named Wallyum
07-12-2005, 07:49 PM
Bill, I'm glad you can take it that well. I'd be mighty bummed about the losses. I've been known sneak out with a saw, too :)

I know about you and your respect for nature. ;)
Then again, if these rockets weren't all at the 40-60 foot level in 80-100 foot tall trees, I'd give your method a try. But I've got a bunch of Big Dawgs and Baby Berthas, and the Solar Sailer II is easily clonable. Guess I'll live and learn. :rolleyes: