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Projectile hang times

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Projectile hang times

Unread postAuthor: SpudBlaster15 » Mon Nov 13, 2006 12:52 am

Just wondering, how long have you gotten a potato, fired from a combustion cannon, to hang in the air? Today I managed to get a potato fired out of my over/under cannon to hang for 17 seconds using starting fluid as fuel. I would like to know how this compares to the results of others.

Thanks.
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Unread postAuthor: Pete Zaria » Mon Nov 13, 2006 1:04 am

Haven't tried with potatoes. I get ~40 second hang times with golf balls out of my big (250ci chamber) combustion, with a 7' barrel, using metered propane. I'd bet 20-25 sec with a spud.

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Unread postAuthor: SpudBlaster15 » Mon Nov 13, 2006 3:02 am

Wow, 40 seconds. Was that golf ball fired out of 1.5" SRD 21, or 2" pipe with wadding?
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Unread postAuthor: Pete Zaria » Tue Nov 14, 2006 7:02 pm

Home made golf ball barrel (cut a 1/4" slit lengthwise out of 2" pipe, and force it into another section of 2" pipe). Wasn't a perfect fit, but worked OK. I broke that barrel a long time ago. I need to find a local plumbing shop that sells SDR-21.

Also, I haven't timed a golfball hang time run with a stopwatch, just counting "one onethousand" etc... so 40sec might be a little generous. 35 at least :)

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Unread postAuthor: pyromanic13 » Tue Nov 14, 2006 11:52 pm

for my science class we had to figure out projectile tragectory/hang times in order to hit my science teacher with a water ballon.
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Unread postAuthor: mindtrickonu » Thu Dec 07, 2006 8:49 pm

relevant?? i think not
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Unread postAuthor: pyromanic13 » Thu Dec 07, 2006 8:52 pm

mindtrickonu wrote:relevant?? i think not


you're kidding? you kicked up this thread just to criticize me?
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Unread postAuthor: drac » Fri Dec 08, 2006 12:53 pm

I was gonna say... talk about a living contradiction... Points out that someone violated the rules, inturn violating the rules himself.

Don't do it again mindtrick, or there might be problems with the higher ups.
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