- Joined
- Dec 7, 2009
- Messages
- 3,562
- Reaction score
- 2,830
Yeah, I did. It looks like I'm not going to get a high speed test in before BALLS. But now I'm thinking about doing a 2-stage test flight at Alamosa this Saturday with smaller motors that would stay under the 15k waiver.
Thanks, James. For the beveling, I'm winging it. I have 100 grit sandpaper taped to a flat granite tile to do some of the taper, and I pinch sandpaper around the edge for the rest.Hey Adrian,
Looks great as always, wondering how you are beveling the leading and trailing edge of your fins. Also if you wanted to save yourself a drive the Chili Blaster event at SCORE is happening soon. I would love to see this thing in action!
-James
Maybe I've just now stolen my new .sig line.<<snip>> ... If records were easy, everyone would have one...
Buying direct it was $131. I would have gladly paid $153 through McMaster.Adrian,
slight tangent here, but how much was the Cotronics epoxy that you bought with the long leadtime? I found out today that McMaster P/N 7563A51 is the Cotronics Duralco 4461IP kit. it's $153 and I can have it tomorrow. If you check the SDS on McMaster for that part number, it comes up as the SDS for Duralco 4461IP resin and hardener.
I'm looking at getting some for a future project, but wanted to find out the cost difference vs. buying direct from Cotronics.
Agreed that it varies a lot with the fiber orientation. The leading edge has a high proportion of the fibers going nearly parallel to it, so the CTE is probably lower than the Aluminum. But I wouldn't be very confident about that since the thickness also has a lot of fibers that aren't very close to parallel to it.Adrian,
You've mentioned the CTE mismatch between the aluminum foil and the fins being too high. What composite cte do you expect at the fin tips? The carbon is low, the silica is low, but the epoxy is high. Ive seen some papers on the subject, but it varies quite a bit between parallel to the grain vs. perpendicular to the grain.
Yes. I need it at both ends; the front of the case also holds the nosecone and recovery gear. I was starting to figure out a combination of cases and adapters that would stay within the waiver before I thought of the boosted dart option.Looks Great, Adrian.
For the boosted dart, are you keeping the empty Loki case inside, as the interstage coupler? I assume you will be doing a separation charge at burnout.
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