730gr upfront. do you think i'll get it to fly? tuning under way now

ozy clint · November 26, 2013, 11:33:00 PM

i want to stick with the axis shafts i'm now using. 5/16 shafts look like logs now i've been using axis. I want to perservere with my new adapter because i believe this arrow will be the strongest arrow i can make. When i get it going, all will be revealed.

Fanto · November 27, 2013, 01:26:00 AM

Clint,

As i said earlier, Ashby found that the key to stopping the shaft breaking was to create a design that gradually slowed the bending.

hence his internal footing design being a 7" dowel, tapered from the mid point back, and glued in only from the mid-point forward.

have you thought about this solution?

ozy clint · November 27, 2013, 02:48:00 AM

yes, i've heard of ashby doing that. With my setup the end of the outside footing is about 3/4" behind the balance point. Therefore the balance point, (centre of mass) has little to no leverage against the weak point. The centre of mass pushing on the weak point, which is in front of it in 'normal' arrows is the main cause of breakage there in my opinion.

Looper · November 27, 2013, 03:30:00 AM

I made up a couple of those internal footed shafts using an AD Hammerhead, a hardwood dowel, and tipped it with a 160 grain Stos head. I think they weighed around 750 grains total. They were very tough arrows. I shot them into concrete blocks for some testing. The heads ended up bending, but the shafts didn't break. That was out of a non-acs Adcock pulling around 64#@31". The only thing about the AD shafts is that they are pretty thick, way larger than even Goldtips.

Keep us posted Clint.

ozy clint · November 27, 2013, 03:56:00 AM

yes, i've heard of ashby doing that. With my setup the end of the outside footing is about 3/4" behind the balance point. Therefore the balance point, (centre of mass) has little to no leverage against the weak point. The centre of mass pushing on the weak point, which is in front of it in 'normal' arrows is the main cause of breakage there in my opinion.

Fanto · November 27, 2013, 04:05:00 AM

Clint

Sounds interesting to me, hope it works well, post here and let us know

Looper · December 04, 2013, 03:48:00 PM

What's the latest?

ozy clint · December 05, 2013, 03:30:00 AM

back on 'daze' off from work now. i work 9 days on 5 days off. just got to tidy up a few jobs around the house then i'll be able to do some more tuning. it's blowing about 20-25 knots today so i wouldn't have been able to do any today anyway. hopefully in the coming days.

i have since bought some 340 and 400 spine axis to try. i think i'm getting false weak readings with the 300's.