Welcome to the forum! I'll just watch from the sidelines to keep from overwhelming you with info. I did want to say this looks like a really fun project for the kids and I look forward to seeing how it progresses.
-Hans
-Hans
Another question is should the rocket have any vents in it or anything to prevent it from deploying early due to the pressure change?
No hybrid ever includes an ejection charge, which makes using a hybrid in this context even more perplexing.Does the Hypertek motor come with an ejection charge?
If it is based on SystemsGo, that was started in 1996, before the BATFE battle which removed APCP from the explosives list. Hybrid motors were unregulated at that time and so were easier to do for something like a school. Now that APCP is unregulated, they could update their program to allow APCP motors and the design possibilities would open up significantly. Motor selection choices alone would go from less than a dozen to hundreds.No hybrid ever includes an ejection charge, which makes using a hybrid in this context even more perplexing.
Presumably this is SystemsGo https://www.systemsgo.org/ -- I've never gotten how this program is supposed to work; it comes up from time to time on TRF.
Maybe your first large one is just a bit too large. Learn to fly an E motor before you learn to fly an L . hint.Yeah, we pretty much are taught a bunch of basic physics concepts and told to apply them to our rockets. In the first semester, we built 3 very small model rockets that we had to design ourselves but this is our first large one and they aren't giving us many hints.
I find it hilarious that you're building a rocket to go a mile high with a one pound payload and your concerned that the weight doesn't include the Altimeter. That my friend is a red flag.In my rocket science class at school, we are building a rocket that is supposed to be able to fly a mile high carrying a 1 pound payload, which doesn't include the weight of the altimeter. Also, it should land within a recovery radius of 2500 ft with the wind settings I added to my open rocket file which I will upload. We have a $1000 budget and this is what I have so far, but I am struggling. I mostly need help lowering the recovery radius and squeezing out some more height because I haven't even added the weight of the charges to the design yet. I don't have many engine options but they are all in the file, and they are different prices. Our budget can't do the L engines or the J300 series ones. I need help please.
Sounds to me that YOU should be the one ignoring Sluggo. Read what I posted. If that doesn't make sense to you, you MIGHT be being irresponsible.Ignore Sluggo. He has an opinion and a keyboard but no relevant solutions.
Did you watch the Apogee video about dual deployment linked in the post above? It's got great information in it.
Thrustcurve.org is another good resource. You can input the diameter and weight of your rocket and it will give you a table of hybrid motors with their altitudes, speeds, and other good info. It's simplified, but a bit more efficient than Open rocket to quickly get you in the ballpark with weight and diameter.
Spot on Mike. You have the proper perspective. Thanks for this post.^^^^^^^^^^^^^Don't blame the student for seeking help, blame the organization that thinks throwing kids into the deep end like this with no adequate mentorship is a good educational strategy.
Maybe this is a worthwhile thing, but it sure doesn't seem like it to me. Does anybody have any experience with SystemsGo? (assuming that's who we're talking about.)
Don't blame the student for seeking help, blame the organization that thinks throwing kids into the deep end like this with no adequate mentorship is a good educational strategy.
Carpenter's glue (like Titbond II or III) is just as strong as epoxy for wood/cardboard applications.You'll be fine at these speeds as long as you use the high power grade cardboard (not the Estes thin wall stuff). If you were getting up near Mach 1.5-2, I'd worry more. If you have the budget, use a slightly better grade of epoxy than the 5-minute stuff from Home Depot or the hobby store.
This is the most important and best advice that has appeared in this thread.All this said, find a local club that does high power rocketry and get a mentor. They'll walk you through all these things.
This is the largest high-power group on the internet that i know of. If they can't find assistance and mentorship here why would they then try at a smaller local group? The comments about mentorship on this website are astoundingly repetitive, and could be argued as an impedance to the youth that frequent this sight. Either offer assistance/guidance or don't.This is the most important and best advice that has appeared in this thread.
This is the largest high-power group on the internet that i know of. If they can't find assistance and mentorship here why would they then try at a smaller local group? The comments about mentorship on this website are astoundingly repetitive, and could be argued as an impedance to the youth that frequent this sight. Either offer assistance/guidance or don't.
Bingo.It's also often helpful to have one person who says "there are many ways to do this and here's my choice" rather than 10 people saying the same thing and arguing with each other.
Would it be a reasonable idea to 3d print our fins?
Also what about 3d printing the nosecone?
It would not. It adds too many structural variables to the fins that could be avoided just by using aircraft plywood or fiberglass.Would it be a reasonable idea to 3d print our fins?
Jolly logic chute release would be a bad idea given your budget as it would eat up a chunk of it. I was a big fan of jolly logic products but for the price given a student group, I'd recommend against it. A line cutter is simple to make for a dollar or so in the material if you have access to a lathe. Also a great introductory project for learning how to work with a lathe. I'd go eggtimer quark redundant pair with apogee charges and line-cutters. You can get very lightweight with this setup and it's well within the limits of the electronics without taking a bite out of your budget. If you have a problem with getting/making a line cutter pm me and I may be able to help. I make them for a few cents and treat them as single-use or disposable depending on the application.
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