Parachute Sizing? MAXI GROOVE TUBE

Is there any rule of thumb on Parachute sizing? I am trying to size one for my MAXI GROOVE TUBE, It weight 13.5 oz fully loaded with a D12-3. Tubing is BT-80 next to it is a BT-5 version. The XBOX box is there for size comparison.

forgot the pic.

13.5oz? Go with an 18-24" for faster descent or a 30-36" for slow, floating descent.

if you want acheap chute go with the 24" milar its perfect and works every time. And is pretty reliable but it tagles easily if care is not taken. If money isn't problem a top flight 18"-24" would be good.

EMPR'S Parachute size calculator.

https://www.rocketreviews.com/cgi-bin/myemrr/recoverybox.cgi

The EMRR calculator is a bit on the large size for larger rockets. This can be good or bad - if I relied on it for one of my rockets, I would need a 60-75 inch chute. With a 48, it already drifted 2 miles once. However, with something like this, I would go with the chute calc, as it will not be going high and a gentle landing will help it.

I guess I just build mine too heavy. I usualy cut a hole in the tope of my chute. I used the chute size for my mostly stalk big bertha with no hole in the chute. I thought I would be safe cause it was on the heavy side. The third launch it drifted off never to be seen again. I do seem to have that trouble with chutes. For me it seems to always be a choice in risk reduction. Risk my rocket hitting the ground to hard or risk having it float away. Really isnt much reduction just risk.

It said I need a 34" chute. I think I will try a 24". hopefully it wont go to high with a D12-3. The motor mount in it can also use an E engine.