36 replies to this topic

[BengalFlair]

Val77 requested me for a sketch of my parachute flare rocket but I think it would be better to post some pictures of the arrangement of contents of that rocket. There were 19 flares (2\8” dia, 4”long) which were placed 18”apart to the hemp string. Parachutes were 18” in diameter and made with hand craped tissue paper. The rocket motor was a 2lb core-burner with homemade tube and hand crimped nozzle. I also embedded the video along with the pictures and think it will help you guys those who are interested in parachute flare rockets.

 parachute flare 1.JPG   783.86KB   123 downloads  parachute flare 2.JPG   759.36KB   116 downloads

[AlexPyro66]

Great rocket do you think 1lb bp motor will lift a shell like this

[val77]

thanks dude !

[val77]

i can use 1/4 tubes (6mm id and 50mm long) for make tiny flares ?

[JFeve81]

Nice!

[BengalFlair]

do you think 1lb bp motor will lift a shell like this

Possible.

i can use 1/4 tubes (6mm id and 50mm long) for make tiny flares ?

You will get short duration with shorter flare tube .

[val77]

just for 10 seconds illumination is ok ?

[BengalFlair]

It is too laborious to make a rocket like this so is there anyone who does not want to make it last longer in the sky? But you should always adjust the duration of flares so that it must never cross the safe flying zone.

[mabuse00]

Interesting stuff, thank you.

How did you attach the strings to the parachute material?

Once I tested some parachutes for that application, made out of garbage bag foil on a model airplane.

Flying at ~50km/h the parachutes often failed when deployed out of a tube with a little H3 and a dummyload - the strings severed from the foil.

And I seldom manage to break my rockets exactly at their apogee.

Did you guys find any of your your parachutes after firing?
How do they look, is your burning protection sufficient?

you should always adjust the duration of flares so that it must never cross the safe flying zone.

I'd rather say you have to be ready for a worst case scenario and shoot only where you can't do much damage. Your rocket can fail anytime anyway.




edit:

hand crimped nozzle

What kind of technique is that?

Edited by mabuse00, 24 November 2012 - 05:03 AM.

[BengalFlair]

How did you attach the strings to the parachute material?

Did you guys find any of your your parachutes after firing?
How do they look, is your burning protection sufficient?

What kind of technique is that?

I usually smear a little wood glue to the end of the string and place it on the parachute material (hand creped tissue paper) and also paste a small piece of tissue overlapping the string on it.

I found some parachutes in good condition after firing and honestly speaking that I have made thousands of such rockets with the same arrangement with great success.

I use about half dried tube for crimping. I pull the wire with a pliers (as shown in the picture) while rotate the tube around its axis and tie with the same wire after getting the proper opening.

 hand crimping 1.JPG   446.73KB   59 downloads  hand crimping 2.JPG   482.08KB   50 downloads

[psyco_1322]

That sir, is some fine work!

There is a parachute at both ends of the string, so it hangs horizontally in the air? It looked like a piece burnt off in the video, and caused the string to hang vertically.

[BengalFlair]

You are right. Two parachutes were ok after ejection but it was my bad luck that one of them caught fire after a while and a piece was burnt off.

[FlaMtnBkr]

.....and made with hand craped tissue paper

I have lots of this but never thought about using it. Or saving it for that matter.


Oh, someone had to say it.

[val77]

hello ben
what the formula of your red flares ?

[BengalFlair]

The composition of my red flare is as follows (parts by weight)-

• Strontium nitrate---50
• Aluminium (<45 micron coated flake)---10
• MgAl (-60 mesh)---5
• PVC---12
• Sulfur---4

The casing should be rather thin otherwise it would not burn well. Those flare casing were made with 3 turns of 40-50 lb kraft paper and dry rolled with a 1\4”od (about 6mm) Al dowel.

[bidyutbaidya01]

nice sir.i want to know what gauge plastic you use for parachute.

[BengalFlair]

i want to know what gauge plastic you use for parachute.

 

Were you a little more attentive you would have noticed that the parachutes were made of hand craped tissue paper. Although I have used 80/100 gauge poly-sheet with success.

[dagabu]

The composition of my red flare is as follows (parts by weight)-

• Strontium nitrate---50
• Aluminium (<45 micron coated flake)---10
• MgAl (-60 mesh)---5
• PVC---12
• Sulfur---4

The casing should be rather thin otherwise it would not burn well. Those flare casing were made with 3 turns of 40-50 lb kraft paper and dry rolled with a 1\4”od (about 6mm) Al dowel.

 

Very simple mix, I like it!

[BengalFlair]

@dagabu,It's great and indeed, we are extremely happy that you are getting better day by day.Best wishes for your quick recovery and good health.

[bidyutbaidya01]

 

Were you a little more attentive you would have noticed that the parachutes were made of hand craped tissue paper. Although I have used 80/100 gauge poly-sheet with success.

80 or 100 gauge which you prefer for parachute?can i use normal polythin bags?which size parachute i made by polythin that open in air without any obstruction.what you want to mean that hand craped tissue?when i went to buy the hand craped tissue,the seller want to know what is the local name of hand craped tissue.please help.

Edited by bidyutbaidya01, 17 November 2013 - 03:55 AM.