- This topic has 22 replies, 8 voices, and was last updated 17 years, 4 months ago by
Warren B. Musselman.
Warren B. Musselman.-
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Warren B. Musselman
Doug, you DO know how to do it right… Damn…
Warren
Ed Dawson
Doug,
That’s way cool. It look’s like a slight canter to the outboards. Is that the case or just the angle of the photo?
Are you going to light them all off at once?
Doug Gerrard
It look’s like a slight canter to the outboards. Is that the case or just the angle of the photo? Are you going to light them all off at once?
Yes the outboards are angled at just over 3 degrees so I didn’t have to worry about nose cones on them. Actually I wanted the thrust of the outboard going through the Cg “in case”. And yes the plan is to light them all on the pad. This is the first stage of a two stage rocket I’m building. At full power it would have a K700 and eight J350’s for a mid size M with very high thrust to get it moving. Here are a few more shots of the booster section.
Doug
new2hpr
OK Doug, you win. 😛
Anonymous
Doug, that is beyond amazing. Two questions:
a.) how did you discern the pattern for cutting the tapered holes into the bigger tube? I assume this mathmatically derived… I’m just curious how you even begin to derive the pattern for where to make the cuts?
b.) how did you actually cut the FWFT? what tool did you use?
I’m glad I don’t have to clean all those casings 😉 But I will volunteer to clean one or two. That is an incredible project!
FWIW, I have seen some really large clusters lifted with Cesaroni loads. The bp disc at the top of the core of a Pro38 load makes ignition exceedingly reliable. They might be good candidates for trying to light 8 at a time – though it would be easier to round up 8 cases for J350s than 8 ea. Pro38s.
JW
edward
Slicing a cylinder you should get an ellipse. In this case you’d be slicing the motor mount as your cylinder. Then you’d get your ellipse and could draw that and transfer it. 🙂 Just one way to do it – I don’t know how Doug did it though.
Edward
Warren B. Musselman
I would bet looking at what Doug has shown that he drew things up in either Solidworks or Pro/Engineer and had the software figure out the intersection shapes and possibly even make cutting templates or exported it to an NC tooling package like MasterCAM to cut the parts on an appropriate machine tool. That’s what I did with the machined parts in my L3 project.
Warren
Doug Gerrard
a.) how did you discern the pattern for cutting the tapered holes into the bigger tube? I assume this mathmatically derived… I’m just curious how you even begin to derive the pattern for where to make the cuts?
Technically an ellipse is a plane intersecting and a cylinder and this it a cylinder intersection a cylinder. However, I did draw half an ellipse with a width the thickness of the 38 mm motor tube and (half) the length is the height it went into the body tube.
b.) how did you actually cut the FWFT? what tool did you use?
After making the pattern I cut the opening with a dremel tool and a diamond blade. Then I grind out the to the final shape with a sanding or diamond bit. It did take many test fits until it fit. The body tube is actually glued on now but I don’t have an updated picture yet. This project was put on hold for a while.
I’ll post a few more pictures here shortly.
Doug
Doug Gerrard
BTW, this project is called Double Feature named by John Wilke.
Here is looking up the old wazoo. There are spars that run from the center motor mount tube to the outboards.
A shot of the motor mount tubes without the skin and the skin by itself.
Here is a shot of the fins for the booster. And yes they are through the wall mounts and No I can’t describe how its done.
Doug
Warren B. Musselman
Doug, as always, I stand in awe of your projects. I thought I was gonna be the new cool kid at the launches with my NC machined parts. You’ve gone far beyond that.
Warren
Warren B. Musselman
Ed Dawson
Doug Gerrard
new2hpr
Anonymous
edward
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