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Hayabusa Mk.3 Progress https://www.airgunforum.ca/forums/topic65512-15.html |
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Author: | rsterne [ Tue Dec 02, 2014 12:16 am ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
I won't be crimping an all brass shell.... The overshot card I have is cardboard, not plastic, and is snug in the mouth of the brass.... Bob |
Author: | rrdstarr [ Tue Dec 02, 2014 12:33 am ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
rsterne wrote: I won't be crimping an all brass shell.... The overshot card I have is cardboard, not plastic, and is snug in the mouth of the brass.... Bob So your not looking for a "card" to keep the balls or shot in place? I guess I am not understanding what you need? I reloaded from the time I was 15 till I was 40. Pretty damn good at it. |
Author: | Whitewolf [ Tue Dec 02, 2014 9:14 am ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
Bob if you have a problem with your cardboard card falling out try 1-1.5mm cork. This is what I use upon my CR1100 shot shells. Make a hole punch for the cork. Once its inserted it slightly expands and holds very well. It just might be a bit of experimentation to find the right item. |
Author: | rrdstarr [ Tue Dec 02, 2014 2:14 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
Whitewolf wrote: Bob if you have a problem with your cardboard card falling out try 1-1.5mm cork. This is what I use upon my CR1100 shot shells. Make a hole punch for the cork. Once its inserted it slightly expands and holds very well. It just might be a bit of experimentation to find the right item. I have a big roll of 1/16" cork if need be Bob or Kim |
Author: | rsterne [ Tue Dec 02, 2014 4:45 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
If I go through 500 wads and shot cups, even with testing, I'd be shocked.... *LOL*.... I have 25 brass and 25 lbs. of #8 shot (enough for 800 loads).... I'll use the cards unless they blow holes in the pattern.... if they do, I'll try the cork.... Bob |
Author: | Mr.Timberwolf [ Wed Dec 03, 2014 6:42 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
I love your technical knowledge and ability to attack these projects with thought, science, and skill to create such awesome airguns!! |
Author: | rsterne [ Wed Dec 03, 2014 8:54 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
Today I took the valve out, replaced the 70D O-ring that had a slow leak with a 90D, filled the gun from my new Great White, took out my hearing aids, put in my earplugs, and fired the first shot.... Yup, it's pretty loud!.... I had the hammer spring preload at maximum, and at 3600 psi it was just under 800 fps with three 000 Buck.... Not as strong as I was hoping for, but nearly 300 FPE, the most powerful shot I have ever had from an airgun.... I fired a few shots and examined the plastic shot cups I found down by the backstop, and they were all split or blown open through the middle of the base.... I wondered if possibly I was getting a lot of blowby, so I used a 1/4" thick fibre wad in the shell first and then the three Buckshot (no shot cup), and got more consistent and higher velocities.... The highest I saw was 817 fps, and that was 7 yards from the muzzle, so that corrects to 833 fps at the muzzle (313 FPE) at just under 3000 psi.... I got 7 shots from 3600 psi down to 2700 within 4% ES.... The disappointing part of the first tests was that I don't have enough hammer strike.... I got a very nice shot string, but I'm maxed out, and the peak is at just under 3000 psi.... This is despite having a 237 gr. hammer with 2" of travel and a spring that takes 36 lbs. to cock.... and a PEEK valve.... Before I make any changes I will try the .457 Rifle barrel with some 220 gr. bullets I have, and some roundball, just to get a baseline.... I have no idea how I could increase the hammer strike if I need to, to get more power.... Bob |
Author: | EverHopeful [ Wed Dec 03, 2014 9:08 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
Hmm, it's not like 300+ fpe is exactly bad. If you settled for that I'd still call it a roaring success. But I know you'll want to see how far you can take it, just for the challenge Looking forward to hearing the results with the rifle. Thinking of which, how's your backstop holding up to the abuse? I have an amusing image of doing penetration tests with this thing - "we're going to need some more soap!" Jim |
Author: | rsterne [ Wed Dec 03, 2014 9:44 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
I rebuilt my backstop before this round of testing.... It is a wooden box 12" x 16" inside, with a 3/16" steel plate in the back, and 6 layers of OSB in front of that, and then a couple of layers of cardboard on the front to hold the target.... With enough use the OSB turns into a pile of chips on the floor.... I've never used it for anything at this power level before, so I'm keeping a close eye on it.... and I have three 32" x 48" pieces of 3/4" plywood behind it as a shield for the wall in case anything ever goes through.... Bob |
Author: | Whitewolf [ Thu Dec 04, 2014 2:44 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
Bob, would you be able to add lead to the core of your hammer design to increase the mass? |
Author: | EverHopeful [ Thu Dec 04, 2014 2:53 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
Bob, what's the ID of the gas tube? I have a very crazy idea for your hammer |
Author: | Ace [ Thu Dec 04, 2014 8:52 pm ] |
Post subject: | Re: Hayabusa Mk.3 Progress |
great work as usual Bob |
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