What's the difference between the yellow and blue tape?
What's the difference between the yellow and blue tape?
2013 impulse burned: 5205.1 Ns
2013 impulse lined up to burn: ~56,445 Ns
Anyways. On to new things. I have started building a launch tower with parts from old projects around the lab. I'm using 6, 5' sections of 8020 T-Slot inside of a large air tank holder. I am going to use 12 7" sections of angle iron to make the diameter adjustable. I should be able to finish it later today as soon as I can get into the shop to cut all my angle iron. I tried to use a dremel tool to cut angle iron and it was awful. I am wondering if I should make the tower attach to an existing launch pad or make my own stand for it?
Next, I found an old vaccum oven and I put the Mariah in it at about 150 degrees (is that a good temp?, it can go much hotter). The epoxy got much harder in the couple hours I was there. It should be ready to sand soon.
I also did the first coat of primer on the Chariot and did some light sanding.
Last edited by tagerton; 13th July 2012 at 03:50 PM.
A few updates. I mostly completed the launch tower this weekend. It should work very well. My only concern is that the plates attaching the center rods can catch the fins if there is significant rotation in the rocket. I could machine down those plates, or I could not worry about it.
The Chariot got its second coat of primer. Painting is hard! Trying to get paint in between the fins and the booster tubes is very challenging without getting really thick spots nearby.
The Mariah fin fillets are sanded and the spirals are filled. Painting will commence soon. I am thinking about doing a paint scheme somewhat like the BMW art car. Something about it really appeals to me.
I launched the Chariot! .... and it crashed. At ejection, due to the lack of motor retention, it popped the motor and not the chute. I may build my own motor retention for it now. The only real damage, (other than a few cracks in the tube which are already fixed) is the nosecone. The phenolic tubing is amazingly durable. I want some more. If anyone knows where to get another Rocket Vision nosecone for the Chariot let me know.
Also, the Mariah is primed and ready to be painted after 4 coats of primer and sanding. The seam between the nosecone and tube is invisible as are the spirals (finally!)
I have come up with, what I think to be a really cool paint scheme. Hang tight.
Paint is the devil! (not really, I just looked at that thread too much).
... but it does feel like that sometimes. I am painting my fins different colors. I painted one fin blue, and it looked great, and then I waited 48 hours and masked it off to paint the other fin. I painted that fin red, and then after a few hours put it in ~150 degree heat for ~4 hours to help cure it. When I pulled off the tape on the blue fin, it was ruined. Now I am going to sand down the blue and repaint. So, was it the heat + the masking tape, or just the masking tape? I am wondering how long I need to wait before I mask off a painted color. I am using Rustoleum ultra 2x.
Something arrived in the mail.... Uh oh... it looks like an Extreme Wildman kit. Oh dear, that may just have to be built soon.
On another note:
Altimeters. I am planning on getting a Telemetrum for primary tracking / deployment purposes. I need a backup and I am liking the looks of the Adept22. It is reasonably priced and should fit the bill.
I have continued painting the Mariah. It has proven more difficult than I anticipated. The bottom area is mostly done. Some of the paint is not as smooth as I would like. I am debating whether to sand the paint or to sand the clearcoat or to sand both.
Those nose section, I painted red, blue, and yellow in equal parts. I sanded down the paint with 600, then 2000 grit. It looked good. Then I wiped down with some alcohol, and clear coated. It wrinkled in two spots (primarily on the yellow). Very frustrating. It could have been due to incomplete evaporation of wet sanding / alcohol (although I don't think so). It could have been I applied the clear coat too thick. I'm really not sure why it did that. I waited more than 48 hours after painting. (The yellow coat was the last one).
I am using Rustoleum ultra 2x on everything. Right now I have sanded down the clear coat past the wrinkles. I will try clear coating again, then sanding and polishing it.
Also, as seen in my Wildman Extreme build thread, my Telemetrum arrived. One problem, it barley fits in the 29mm payload bay, and the mounting holes are too spread out to fit on the payload by sled. I may install small wooden blocks for it to sit on.
Yeah, for my next rocket I may be trying another type of paint. Actually, I kind of want to go talk nicely to an autobody shop and see if they can paint my rocket for a reasonable price.
I used alcohol to clean the surface after wet sanding. One thing I have found is the surface needs to be clean before painting. It could've been water that soaked in to the paint as well.
This is the first problem I've had with the Rusto 2x, and it's just with the clear coat. I'm going to try it again, but if it doesn't work, I'll either go with no clear or maybe try that SprayMax 2 part clear that I posted earlier.
What kind of paint do you use?
I usually use Rustoleum paints, and yes, they will wrinkle if you put them on too heavy. It happened to my LOC Fantom
tagerton I have yet to ask you what motor do you plan on using for you Mariah 38?
I need to get a smaller battery for the Telemetrum. The battery it came with is 29.5mm wide. grrr.
Everything is going to be a tight fit with the Adept DD22 as backup with its battery.
I am not sure how I am going to mount the battery(ies?) either. If I have a backup altimeter, then it will need a battery too. It'll be really nice when I have so much room to work with on my wildman!
Today I also ordered a 400mAh Li-ion battery from sparkfun. I'm pretty sure it will work. It's 25mm wide, which should fit. https://www.sparkfun.com/products/10718
Any new updates tagerton?
On the way back, during some very intense rain storms, (So glad I just got new tires!), I stopped by the Apogee Components office in the Springs. I picked up two G76-4 reloads for my Aerotech 29/40-120 case, a 2 grain Cesaroni reload, and a Cesaroni 38mm 6XL case.
I plan on getting L1 and L2 at my next launch. (I already had L1, but lost all the paperwork) I think I should be able to launch my Wildman Extreme on the 6XL too. Or I could really push the altitude and go for 15,000+' on the Mariah.
I'm debating how I should rig up the electronics in the Mariah. I could go with my fully redundant (and very expensive) system, the Adept DD22 and the Telemetrum. It's going to be really hard to fit everything in there. There is less risk for failure of the electronics, but if something goes wrong, I'm out of $400. I hear that some people's air frames on these are unwrapping. That could happen on a 6XL reload. I could just put the Telelmetrum in there, it's more much more functional and expensive. But just for the G's and H's I probably won't need tracking so the DD22 would work by it self.
How often are backup altimeters needed? I haven't tested them yet (I will soon). But I won't have flown any of them at all on the first flight.
My launch site is in New Mexico. Do not worry about the magnaframe unwrapping. You just need to hope for the best that nothing happens because once you go past Mach 1 its anyones game. Just to make sure if you want to make sure nothing goes wrong is make sure there is absolutely no wind. It has to be completely calm. Also fire it off that tower you made so you can get more speed and more altitude. After that good luck .
I have never had back up altimeters. All my deployments so far have never failed. If you feel that you need back up I would go for it. I hear that the apogee event will need a stronger kick to break those shear pins on the Mariah 38. So in my opinion having a back up on that apogee charge would be a good idea. This way in case the first charge doesnt work the second will. Unless you just do ground tests and check if they will break each time from the same amount of powder. Then you will be just find