Packed Chute Size

Is there a reference somewhere that shows suggested required diameter and length in regard to packed chute sizes?

Thanks.

Rocketman provides this for all their chutes. Fruity does, too, I think. Never seen that for smaller chute companies.

lakeroadster said:

Is there a reference somewhere that shows suggested required diameter and length in regard to packed chute sizes?

Thanks.

Click to expand...

Most of the time you will find what volume is needed by figuring out what pack density you are comfortable packing the chute at. For most flyers it is .20oz/in^3. Packing at .30oz/in^3 is close to the limit of hand packing. All you need to do is divide your chute's weight by the pack density and you'll get your volume. You already have the compartment dimensions so calculate the volume and see if the chute will fit. Different vendor had different volume recommendation but a lot of hitting the recommended volume is on the user so practice packing and get good at it if you want to pack parachutes into small volumes.

Bat-mite said:

Rocketman provides this for all their chutes. Fruity does, too, I think. Never seen that for smaller chute companies.

Click to expand...

Do you like seeing the volume requirements by dimensions or volumes?

IputtheAinBAMA said:

Do you like seeing the volume requirements by dimensions or volumes?

Click to expand...

I would prefer dimensions. But I am not the OP.

IputtheAinBAMA said:

Do you like seeing the volume requirements by dimensions or volumes?

Click to expand...

Volume probably makes the most sense... then we can do the math based on what diameter our rockets are.

So based on the data IputtheAinBAMA provided above I made a spreadsheet to calculate packed volume...

Seems correct...

Once I pack a chute and am happy with the dimensions that I get, I make up a roll from an old t-shirt and duct tape. I use that for ground ejection charge testing and any further "fit" testing for subsequent builds.

I often use this chart for a quick general reference: https://publicmissiles.com/images/chutepackingrequirements.pdf

Here's a jpg of quick general reference Banzai88 linked to above.

This chart appears to use a Packing Density < 0.10 oz/cu-in, which is pretty loose.

SkyAngle chutes has a table but only for their chutes.
https://www.b2rocketry.com/faqs.htm#tube space

lakeroadster said:

This chart appears to use a Packing Density < 0.10 oz/cu-in, which is pretty loose.

Click to expand...

Yup, usually represents a 'worst case scenario', especially for distracted days at the field, and newbies not used to packing tightly......which makes it a perfect general planning guide.

timbucktoo said:

SkyAngle chutes has a table but only for their chutes.
https://www.b2rocketry.com/faqs.htm#tube space

Click to expand...

Banzai88 said:

Yup, usually represents a 'worst case scenario', especially for distracted days at the field, and newbies not used to packing tightly......which makes it a perfect general planning guide.

Click to expand...

Comparing the two charts... For a given chute size SkyAngle is about twice the packed length of PML.

Both are made from 1.9 oz fabric..

https://www.b2rocketry.com/faqs.htm#tube space

https://publicmissiles.com/PMLRecoveryComponentsFAQ.pdf

Thanks for the input guys... much appreciated.