fixing rocket motor

ktc · Feb 3, 2020

Hi.How can I fix rocket motor to innertube. It should be removable.How is mounting clamp?

Zeus-cat · Feb 3, 2020

How big is your motor? The more powerful the motor the more difficult this can be. Why do you need to remove the motor mount?

crossfire · Feb 3, 2020

Are you talking about a motor retainer?

Greg Furtman · Feb 3, 2020

ktc said:
Hi.How can I fix rocket motor to innertube. It should be removable.How is mounting clamp?

What size motor are you talking about? How you retain them pretty much depends on size.

ktc · Feb 3, 2020

Greg Furtman said:
What size motor are you talking about? How you retain them pretty much depends on size.

50 cm and 14 cm diameter

ktc · Feb 3, 2020

ktc said:
50 cm legth and 14 cm diameter

ktc · Feb 3, 2020

Zeus-cat said:
How big is your motor? The more powerful the motor the more difficult this can be. Why do you need to remove the motor mount?

50 cm leght and 14 cm diameter.Total weight of motor is 4 kg.Motor should be removable because I will use a motor one time.Then I need to remove it

ktc · Feb 3, 2020

crossfire said:
Are you talking about a motor retainer?

I dont know what is it?

Bat-mite · Feb 3, 2020

You need forward and aft retention. Forward retention prevents the motor from shooting out of the nose cone when thrust occurs. Aft retention prevents the motor from falling out of the rear end when thrust stops.

This is normally done with a thrust ring and a retainer. The thrust ring is attached to the motor and is broader than the motor so that it creates a stopping point.

Second, you need a retainer. The retainer prevents the thrust ring from moving forwards or backwards while inserted into the motor mount. There are screw-on retainers, bolt-on retainers, retention hooks. etc.

A picture is worth 1000 words.

https://www.google.com/search?q=roc...XBmHIEHaZDBCMQ_AUoAnoECAwQBA&biw=1680&bih=907

ktc · Feb 3, 2020

Bat-mite said:
You need forward and aft retention. Forward retention prevents the motor from shooting out of the nose cone when thrust occurs. Aft retention prevents the motor from falling out of the rear end when thrust stops.

This is normally done with a thrust ring and a retainer. The thrust ring is attached to the motor and is broader than the motor so that it creates a stopping point.

View attachment 405500
Second, you need a retainer. The retainer prevents the thrust ring from moving forwards or backwards while inserted into the motor mount. There are screw-on retainers, bolt-on retainers, retention hooks. etc.

A picture is worth 1000 words.

https://www.google.com/search?q=roc...XBmHIEHaZDBCMQ_AUoAnoECAwQBA&biw=1680&bih=907

Thanks a lot.

Zeus-cat · Feb 3, 2020

What is the purpose of this project? What do you want to learn? Is this for a university experiment? Are you in Turkey?

cerving · Feb 3, 2020

I recommend that you go to a few of the rocketry vendors' web sites (Wildman Rocketry, Madcow Rocketry, LOC Precision are a few...) and download some of the instructions for their kits. Most hobby rocketry kits are built more of less the same, but some of them (particularly Wildman Rocketry) have alternate ways of construction that may be of interest to you.

cbrarick · Feb 3, 2020

holy cow! A 5.5 inch motor? If you're not aware of motor retention techniques, I'd highly encourage you to rethink your project, start smaller and find a mentor. After all, even with tame propellants that's a "N" motor - not a starter motor!

jlabrasca · Feb 3, 2020

Zeus-cat said:
What is the purpose of this project? What do you want to learn? Is this for a university experiment? Are you in Turkey?

I have a PM from @ktc. They are from Turkey and, if I understood correctly, it is a student project. I've asked that they post a diagram to this thread.

Edit. @ktc also wrote that it is a 3200N•s solid propellant motor.

samb · Feb 4, 2020

The young Turks have visited us before. Many are making their own motors. Send them to the Tripoli prefecture in Ankara perhaps ?

https://www.tripoli.org/Prefectures

ktc · Feb 6, 2020

Bat-mite said:
You need forward and aft retention. Forward retention prevents the motor from shooting out of the nose cone when thrust occurs. Aft retention prevents the motor from falling out of the rear end when thrust stops.

This is normally done with a thrust ring and a retainer. The thrust ring is attached to the motor and is broader than the motor so that it creates a stopping point.

View attachment 405500
Second, you need a retainer. The retainer prevents the thrust ring from moving forwards or backwards while inserted into the motor mount. There are screw-on retainers, bolt-on retainers, retention hooks. etc.

A picture is worth 1000 words.

https://www.google.com/search?q=roc...XBmHIEHaZDBCMQ_AUoAnoECAwQBA&biw=1680&bih=907

thanks for your help.it's really worked out

ktc · Feb 6, 2020

jlabrasca said:
I have a PM from @ktc. They are from Turkey and, if I understood correctly, it is a student project. I've asked that they post a diagram to this thread.

Edit. @ktc also wrote that it is a 3200N•s solid propellant motor.

thanks a lot

ktc · Feb 6, 2020

samb said:
The young Turks have visited us before. Many are making their own motors. Send them to the Tripoli prefecture in Ankara perhaps ?

https://www.tripoli.org/Prefectures

I will contact them.Thanks

dpower · Feb 6, 2020

And I was trying to visualize a flying innertube...

fixing rocket motor

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