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anthony domzalski

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put together my first 38 mm "wildman punisher". decided to ground test it. , make sure the parachute deploys etc... 38 mm Cesaroni engines. the engines blew up????did I do something wrong??? could use some help
 
Pull the motor out and post some more pictures if it is safe to touch. Sounds like you blew the forward closure area with recovery Black powder already in it up.
 
Under the white cap on a Ceasroni motor there is live black powder which is flammable if not emptied first for dual deploy.
 
7128D39B-1C39-4962-AF0D-46018E90CD0A.jpeg
This white cap did you puncture it and drain powder before trying ground test?
 
I would never ground test with a live motor in the rocket. You don't really need to fully block the area where the motor would be. Just stuff something nonflammable in the rocket to block most of the motor tube. Dog barf works well.
 
Zeus-cat said:
I would never ground test with a live motor in the rocket. You don't really need to fully block the area where the motor would be. Just stuff something nonflammable in the rocket to block most of the motor tube. Dog barf works well.
Click to expand...

True I’ve used dish wash rags. I’m just trying to find out what went wrong.
 
Are you flying this dual deploy? Can you elaborate on your statement "the engines blew up"? Why would the motor fail for a ground test & why did you even have the motor in rocket for a ground test?
 
timbucktoo said:
Are you flying this dual deploy? Can you elaborate on your statement "the engines blew up"? Why would the motor fail for a ground test & why did you even have the motor in rocket for a ground test?
Click to expand...


+1 ????
 
So, I built a couple of rockets with my son, all are 38mm. I thought it would be a good idea to test them on the ground to ensure the engines didn't fall out, and the nose cones, parachutes would deploy. So, I loaded up a rocket with a 01 grain cesaroni casing and ignited it with the rocket locked down to the launch rail with household clamps; didn't change or alter the delay, just loaded it and fire. The motors didn't burn, they blew up. tried it twice. 02 one grain motors, same results.....
 
Were your reloads old? Pro38 motors had an issue with the forward bulkheads a few years ago.

Better yet, can you post some photos of the failed motors?

Where are you conducting these static tests?
 
So you tried launching a rocket with rocket clamped to rail? Is that what you’re saying? Any pictures or the failed motors?
 
This is exactly the reason why I'm just now starting with less expensive RMS 24/40 to try out reloadable motors and work my way up with experience. This small leap was even after playing with BP motors for years and learning staging, building techniques etc.
 
Last edited:
me thinks he could have loaded the reload without the case at all...
so, question is, did you slip the reload (black plastic) into a aluminum casing which you then had to screw the aft closure into the motor tube?

Sorry if i'm a little basic, but I've seen this before....
 
JERRYR708 said:
This is exactly the reason why I'm just now starting with less expensive RMS 24/40 to try out reloadable motors and work my way up with experience. This small leap was even after playing with BP motors for years and learning staging, building techniques etc.
Click to expand...

CTI motors aren’t really reloadables. They are single use motors in a case. Nothing to worry about, no experience to gain.
 
Even if he didn't do what we think he did.....just reading this has me laughing so hard i Kant type.
More info...heck with thaaaat..I wanna see video.
Got that?
By the way, what size Punisher...sounds like description of a Punisher Sport SS.
 
grouch said:
CTI motors aren’t really reloadables. They are single use motors in a case. Nothing to worry about, no experience to gain.
Click to expand...

Oh they are reloadables alright and the OP likely found out the hard way there is something to worry about when the black reload propellant tube isn’t put into its aluminum pressure vessel.
 
JERRYR708 said:
This is exactly the reason why I'm just now starting with less expensive RMS 24/40 to try out reloadable motors and work my way up with experience. This small leap was even after playing with BP motors for years and learning staging, building techniques etc.
Click to expand...

When you build one of these smaller Aerotech reloads you can transition to a high power RMS 38/240 casing or other Aerotech high power reload pretty easily. The only difference on the high power reloads is they offer like a 14 second delay and you drill the delay down with a tool to a time you need. Plus you’ll be like five steps ahead of a CTI user. Unlike CTI you have to assemble the motor piece by piece and that requires attention.

CTI really is so simple that certain people screw it up by not putting the only tube they give you into a casing which causes an explosion or CATO. And for this level kind of stupidity, Aerotech has the DMS line of motors no assembly needed. Yet people screwed those up by not using the included washer which caused the ejection charge to not vent right and their high power rockets came in ballistic.

Just make certain the motor starter is all the way to the top of the reload once it’s assembled. That will hopefully prevent the motor from road flaring in the pad and burning up your rocket.
 
Last edited:
Andrew_ASC said:
When you build one of these smaller Aerotech reloads you can transition to a high power RMS 38/240 casing or other Aerotech high power reload pretty easily. The only difference on the high power reloads is they offer like a 14 second delay and you drill the delay down with a tool to a time you need. Plus you’ll be like five steps ahead of a CTI user. Unlike CTI you have to assemble the motor piece by piece and that requires attention.

CTI really is so simple that certain people screw it up by not putting the only tube they give you into a casing which causes an explosion or CATO. And for this level kind of stupidity, Aerotech has the DMS line of motors no assembly needed. Yet people screwed those up by not using the included washer which caused the ejection charge to not vent right and their high power rockets came in ballistic.

Just make certain the motor starter is all the way to the top of the reload once it’s assenbled. That will hopefully prevent the motor from road flaring in the pad and burning up your rocket.
Click to expand...
Due to the bad weather, I still haven't been able to try my first RMS 24/40 yet. I chose the Aerotech because the reloads are more affordable and I might like more of the hands on experience in it. Thanks for the helpful tips, I certainly don't want any road flares and burning everything up for my first time.
 
5DC5B397-CA13-40E0-A27C-396ABEAB72B4.jpeg
CTI PRO24-6G assembly.
CDEE503F-9992-462D-808D-5C6F713B0755.jpeg
Insert reload into casing.
202051F1-A18C-4F93-B3F6-F643BC4832E7.jpeg
Remove NoZZLE cap.
47E8DA3B-5417-4CEF-97CD-713546925FBB.jpeg
Tighten aft closure
1E810E25-EC76-4BE3-A572-2E66613A6EC6.jpeg
Put NoZZLE cap back. Done.
 
059C66AA-43AD-4741-8369-61DF42BCED70.jpeg
Aerotech H130W assembly 38/240.
1B2F29F1-6DBB-4CF5-A610-3BA959BFB8F4.jpeg
Delay grain.
E74E7CC1-7536-42EA-BA78-9E7061A66410.jpeg
Drilling delays.
8119F388-CD39-4A45-8979-ACCC6A8F1BD9.jpeg
Assembly of delay. Lube o ring.
DD61C8B0-DFAC-4C22-ABB6-C32E2F4ECCAD.jpeg
Press into forward closure.
E6A6F924-75FE-4988-882C-DD213A75AF1D.jpeg
Lube O ring.
3A6221C7-C714-4E4C-B0C8-2555CF4F6744.jpeg
Screw casing into closure.
5FC9FD33-E336-4A55-A0DF-0D583CB08BA0.jpeg
Forward seal disc. To be continued.
 
F623903A-2B75-4A0C-BA2D-7131D14EDA26.jpeg
Load APCP fuel grain.
BC333243-0DE1-4F11-B969-324C3A816706.jpeg
Aft seal disc.
43C6E02C-79FA-42F3-BE87-FDA9D1DBC4BF.jpeg
NoZZLE plus o ring lubed.
F3BB7D50-A991-463B-8117-4BA7C94A8132.jpeg
Aft closure.
A9C22BA3-B0B0-488F-B279-7590377C7CF2.jpeg
NoZZLE cap.
73674BEE-CA25-4445-9B88-E0EB98E0BE71.jpeg
Add ejection charge.
328F8605-0E3F-4F52-A6FC-66874B5535AA.jpeg
Ejection charge cap.
182F86E8-5AFC-424D-A2B3-5B5D4D2DD6A0.jpeg
NOTE motor starter not inserted until READY TO FLY. Tripoli Safety codes.
 
E9B8AA49-5DEC-4673-A3D9-DDA795EDCBE2.jpeg
At this point when the rocket is in the rail do you insert igniter. This is for safety reasons.
 
Andrew_ASC said:
When you build one of these smaller Aerotech reloads you can transition to a high power RMS 38/240 casing or other Aerotech high power reload pretty easily. The only difference on the high power reloads is they offer like a 14 second delay and you drill the delay down with a tool to a time you need. Plus you’ll be like five steps ahead of a CTI user. Unlike CTI you have to assemble the motor piece by piece and that requires attention.

CTI really is so simple that certain people screw it up by not putting the only tube they give you into a casing which causes an explosion or CATO. And for this level kind of stupidity, Aerotech has the DMS line of motors no assembly needed. Yet people screwed those up by not using the included washer which caused the ejection charge to not vent right and their high power rockets came in ballistic.

Just make certain the motor starter is all the way to the top of the reload once it’s assembled. That will hopefully prevent the motor from road flaring in the pad and burning up your rocket.
Click to expand...

The original poster is a grown man with a son interested in getting into rocketry..
We are all a product of everything we've ever lived , done , and experienced..
He is most certainly not stupid because he never flown rockets before..
On the contrary, he's probably quite smart, after all, he has an interest in science / rocketry
and see's hobby / sport rocketry as a great thing to get into with his son..
He'll get to spend time with his son, his son will learn some great things and look forward to have a ball spending time with his father..
I couldn't agree with him more..
Everyone that has posted in this thread please go back and read the thread in its entirety..
Is this the way we welcome a new father and son into rocketry ??

Teddy
 
To add to Teddy's post, it is also highly possible that English may not be the OP's primary language. Let's cut him a little slack folks.....

Welcome to the Forum Anthony & Son!!! Please try to keep your fingers away from the animals mouths, they can sometimes bite!!
 

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