Author Topic: catapults  (Read 1238 times)

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Offline Gambo

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Re: catapults
« Reply #20 on: October 26, 2017, 07:35:31 PM »
contacted eBay and they refunded the 99p..............................I had to order another at double the price :(

Geez, being a *orkshireman I bet that really gripped at yer wallet!! :o :P ;D

Offline airgunnut

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Re: catapults
« Reply #21 on: November 05, 2017, 08:31:49 PM »
Got the catapult yesterday, aluminum frame, thin plastic handle :(, in the photos it looked like real wood.
Went to the club with it and the big barnet catapult, the big catapult sent the .44 lead balls down the 25m range, hit the target stand and bounced off, the little catapult sent a .44 lead ball down range and inbeded the ball in the target holder (wood frame) it was going hell of a lot faster than the barnet, with the smaller steel ball baring, the speed was unbelievable, it's also more accurett than the barnet.

Pics and chrono readings to follow when the weather permits.
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Offline Gambo

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Re: catapults
« Reply #22 on: November 05, 2017, 10:18:18 PM »
in the photos it looked like real wood.

That's what a lot of women say after they've made a purchase from the Ann Summers catalogue!!! ::)



Pics and chrono readings to follow when the weather permits.

Yes please!!

Offline airgunnut

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Re: catapults
« Reply #23 on: November 07, 2017, 12:35:12 AM »



the casting of the aluminum is a bit rough


the "wood" grips

it looks like there hydro dipped


might get a bit of wood and make some grips up
"Men occasionally stumble on the truth, but most of them pick themselves up and hurry off as if nothing had happened"
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Offline airgunnut

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Re: catapults
« Reply #24 on: November 07, 2017, 01:42:03 PM »
Got a chronograph set up infront of a backstop (an old sheet folded so it's 4 thick, hung in front of a metal sheet) I had to put a torch with incandescent bulbs above each senser due to been indoors
(borrowed a shooting chrony alpha master)

Barnet Diablo pro
36" pull (my max pull back to my ear, like pulling back on a bow)
7.10 kg draw weight

3 band Chinese cheapo
29" pull (as far as the bands will go)
8.35 kg pull

.44 lead ball. 153.5 grains
.31 steel ball. 31.5 grains

Diablo pro .31 steel   151.7 fps = 1.6 ft lbs
                ..44 lead.  131.2fps = 5.8 ft lbs

3 band cheapo .31 steel   188.4 fps = 2.4 ft lbs
                      .44 lead    174.0 fps = 10.3 ft lbs

Good job I had a spare set of bands for the cheapo as one of the bands broke at the weakest point, the fold as it goes through itself to atach it to the leather sling, might get some rubber tubing to make my own so I can pull it back to what I consider better position (like when pulling a bow back)

The chrono set up was not ideal :(
"Men occasionally stumble on the truth, but most of them pick themselves up and hurry off as if nothing had happened"
Winston Churchill
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Offline rabbit sniper

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Re: catapults
« Reply #25 on: November 07, 2017, 02:18:32 PM »
Be careful with those Ali frames I seen some pictures of someone's face when one snapped  ;)
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Offline airgunnut

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Re: catapults
« Reply #26 on: November 07, 2017, 04:56:26 PM »
Be careful with those Ali frames I seen some pictures of someone's face when one snapped  ;)
i will be getting some strong wood and make some better grips that will cover a fir bit of the u part of the frame to make it better to hold under full pull
"Men occasionally stumble on the truth, but most of them pick themselves up and hurry off as if nothing had happened"
Winston Churchill
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Offline rabbit sniper

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Re: catapults
« Reply #27 on: November 07, 2017, 07:13:50 PM »
Good man keep us posted on your progress pal  ;D
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Offline Gambo

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Re: catapults
« Reply #28 on: November 12, 2017, 09:38:09 AM »
Interesting power results Uggster.

After seeing your pics of the Chinese Cheapo with the grips removed, I echo Dave's comments, as the ali frame looks pretty thin and weedy......too weak IMHO to safely hold back the pressure exerted on it by those 3 bands!! :o :o  It certainly wouldn't earn my trust not to fail! :-\

Offline seagate

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Re: catapults
« Reply #29 on: November 12, 2017, 10:20:49 AM »
  .44 lead    174.0 fps = 10.3 ft lbs
 
 I never realised they could be so pokey.
 
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