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Short question topic

A place to ask general spud cannon related questions.
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Re: Short question topic

Unread postAuthor: farcticox1 » Thu Jul 12, 2018 4:29 am

But there is an alternative, http://www.ipexna.com/usa/products/indu ... s-airline/ Rated upto 185psi, and a full range up to 4"
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Re: Short question topic

Unread postAuthor: farcticox1 » Thu Jul 12, 2018 4:41 am

Has anybody tried dieseling ? Could work with single shot with steel BB's ? Not sure what pressure is needed to achieve combustion.
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Last edited by farcticox1 on Sat Jul 14, 2018 10:41 am, edited 2 times in total.
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Re: Short question topic

Unread postAuthor: wyz2285 » Fri Jul 13, 2018 7:48 am

Anyone here with knowledge about electric motors? I need some benightment :?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: farcticox1 » Fri Jul 13, 2018 7:07 pm

A bit, I am a Industrial Electrician :o
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Re: Short question topic

Unread postAuthor: wyz2285 » Sat Jul 14, 2018 1:26 pm

Wonderful!
Ok so I found these 4 motors with data sheet, however I'm overwhelmingly confused (the one listed as high torque motor seems to have higher RPM than the high speed motor and the high speed motor has higher torque..?)The listing with both high torque and high speed which the high speed seems to have higher torque at maximum efficiency?

this one seems to be the same as the high torque motor from above listing
This one seems to be to be slightly better overall...?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: farcticox1 » Sat Jul 14, 2018 3:21 pm

the 2 high torques look the same, almost most looks like they have the data sheets swapped for the first ones, the high torque has less torque, and the high speed is slower :?
You're right, the 3rd one is double the wattage and higher RPM, 20000 against 15500, if that's what you need. It's going to draw more current if you can happily supply it 21.5A against 15A. Stall currents are high, I guess you don't want to get into a situation where they stall out'
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Last edited by farcticox1 on Sat Jul 14, 2018 3:28 pm, edited 1 time in total.
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Re: Short question topic

Unread postAuthor: wyz2285 » Sat Jul 14, 2018 3:25 pm

The first two uses the same magnets but the blue one uses larger gauge wires, so more amp drain for more power? So there is no such thing as high torque motor without incorporated reduction gearbox? (like these)
The first two only have load data at 4.2v, I can roughly estimate the performance at 8.4v by simply double the numbers? Because the third one only has data at 8.4v
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Re: Short question topic

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Re: Short question topic

Unread postAuthor: farcticox1 » Sat Jul 14, 2018 3:31 pm

you are using 8.4v ?

If you have a slower speed motor of the same power it has to have more torque.

Power (kW) = Torque (N.m) x Speed (RPM)
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Last edited by farcticox1 on Sat Jul 14, 2018 3:34 pm, edited 1 time in total.
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Re: Short question topic

Unread postAuthor: wyz2285 » Sat Jul 14, 2018 3:32 pm

11.1v lipo actually. The blue one from the first listing seems to have slightly higher rpm with slightly less torque than the last one?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: farcticox1 » Sat Jul 14, 2018 3:40 pm

those data sheets are confusing, still looks messed up
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Re: Short question topic

Unread postAuthor: wyz2285 » Sat Jul 14, 2018 3:41 pm

I'm looking at there because they at least have a sheet, there are 100$ plus motors that I'm pretty sure don't have much better specs
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: farcticox1 » Sat Jul 14, 2018 3:46 pm

High speed is 124w and nearly double the torque, high torque is 57w, still looks like they are swapped.
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Re: Short question topic

Unread postAuthor: wyz2285 » Sat Jul 14, 2018 3:51 pm

Maybe the seller means that the high torque one just gives more torque per watt? That case I might buy the third one (black with cnc end bell) as it seems to have similar spec as the high speed one but better built quality
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Re: Short question topic

Unread postAuthor: hectmarr » Sun Jul 15, 2018 2:29 pm

A question. The difference in temperature at which the air is heated in a hybrid, varies a lot or little depending on the stoichiometric ratio of fuel gas, butane or propane, be it 3.5% up to 8%? Does anyone know or have experimented with this?
What should be the proportion that heats the air the most? :roll:
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Actually I'm planning the improvised, and improvising what's planned!
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Re: Short question topic

Unread postAuthor: farcticox1 » Sun Jul 15, 2018 5:57 pm

would a smooth bore 0.177 pellet gun be terribly inaccurate ? :idea:
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