Is it possible to use just a PID loop for keeping a model rocket stable in flight using a TVC mount, or is a model of the rockets physics needed as well as the PID loop? also, is using a drone motor with a propeller on it a good way to simulate the thrust of the rocket motor in order to tune the PID loop on the bench?

I recently got a rocket that has a cluster of 5 engines in a cluster any tips on igniting then all at once

Brand new black Brant IVB-30 for $50 blown up. Just built a new

Brand new black Brant IVB-30 for $50 blown up. Just built this rocket and I was so excited to launch it I didn’t even paint it so for the maiden I used a small d12-5 and it just blew up. And explanations? $50 wasted just cuz of a bad motor?

Hey first time rocketeer here entering UKROC with a school group next year and we are looking to buy some form of launch rail system but we can’t find one anywhere that doesn’t cost £180+?!

Does anyone know a cheaper way to get hold of one or if there is some easy cheaper way to make a decent one ourselves ?

Thanks for any help and happy weekend! :)

The rocket crashed in to the roof when the launch pad was 500ft away and shattered the nose cone

Here's another Hydrazine Design creation hot off the presses!

It's a transition/reducer/adapter for Estes BT-5 to BT-55 tubing. It's to replace the paper transition for the Estes Rain Maker kit (#2009). You can download it for free from Thingiverse and print on your 3D printer.

https://www.thingiverse.com/thing:6859856

This is a 3D model of the Estes PNC-55D nose cone. It is designed to fit the Estes BT-55 tubing. Nose cone length is about 95.0mm (3.75 inches). Dimensions were taken from the nose cone from an Estes Sea Dart kit. 

You can download it from Thingiverse for free and print it on you 3D printer.

Estes kits that use this nose cone:
Kit # Kit Name
1901 Sea Dart
1930 Wasp
2015 Strike Fighter

https://www.thingiverse.com/thing:6849562

I just got a cheep rocket and want to know what I can use for wadding I was thinking about using waxpaper but I don't want it to catch fire so is their anything household items that are nonflammable that I can use?

Does anybody have a schematic of the JollyLogic Snap Mount? I need to see the distance between the screw holes to create an altimeter mount for the mount to go on. I want to design the mount before I spend the money on getting one.

https://preview.redd.it/58ogfwzg2c2e1.png?width=2480&format=png&auto=webp&s=b5777a3644621521854b44c066779a9d3fb65e32

idea came from this post. The idea here is to have molten lithium chlorate and molten sorbitol flow into a combustion chamber and ignite on contact, i doubt this will ever fly or be able to, but this might be interesting as a static fired engine. I am also thinking of putting additives in the sorbitol (ie iron oxide) for performance although i am not sure if this is a good idea as the sorbitol is at elevated temperatures. Sorry if this is the wrong place to post

I bought my son an entry level beginner Estes kit from the local hobby shop, along with 9 engines: 3x "A", 3x "B", and 3x "C".

I took my son to the elementary school to do our launches, because that's the only convenient public place with a large treeless area.

Size "A" engines are great at that field, but anything larger than that and we run increasingly high chances of losing the rocket. We launched 2 size "B" engines, and it was 50-50: one lost, one recovered.

My question is: Where can we go to launch higher elevation model rockets? I live in the Maryland suburbs of Washington, DC.

I have mostly completed my boosted Bertha however I went to apply the water decals and they were unlike any water decals I’ve ever used before. They were incredibly thin, could not be repositioned at all, and tore as soon as I went to put them on. Estes was incredibly unhelpful, with the first time contacting them they just completely stopped responding and closed the ticket and the second time saying they don’t provide replacement decals. Is there anywhere I can get decals or am I sol and will have to find someone to hand letter everything in paint? I’m a little ticked off over the whole thing as there was a couple misprints in the directions about measurements for the engine mounts and spending 35 dollars on a kit to not have it come out nice but oh well

Estes 1:200 Apollo XI RTF, maiden flight with historic launch call...

Nice flight!

I "inherited" a large amount of rocket stuff from a friend's husband who passed away. He had the earlier Boyce Aerospace Fin Can for the Saturn V (Estes 1:100 scale). Does anyone have a copy of the PDF instructions they can share? Thanks!

https://forms.gle/QJcHh55huEP6wnJ4A