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Search: Posts Made By: sajackson
Showing results 1 to 28 of 28
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Forum: Technical
09-22-2002, 12:08 PM
Replies: 9
Views: 973
Posted By sajackson

RE: Calculating arrow speed

MJL,

The virtual mass or efficiency for a given bow(if he has tested them) can be gotten from a Norb Mullaney bow report out of Bowhunting World magazine. Bow & Arrow hunting magazine had similar...
Forum: Technical
08-27-2002, 12:34 PM
Replies: 235
Views: 13,454
Posted By sajackson

RE: Does Kinetic Energy = Penetration?

As Dr Ashby's broadhead penetration tests on African game showed, neither KE nor momentum can be used directly to predict penetration by a given arrow, it is only a magnitude indicator of POTENTIAL...
Forum: Technical
02-25-2002, 04:28 PM
Replies: 9
Views: 654
Posted By sajackson

RE: XX78 weight question?

Easton archery guide shows them as not available for that size(2018), although my calculator does allow you to add 4 grains for one(super uni), which is the weight of the next closest 2016 bushing....
Forum: Technical
02-25-2002, 10:08 AM
Replies: 9
Views: 654
Posted By sajackson

RE: XX78 weight question?

moparman,

The 2018s are under the xx75s, I'm showing 485 grn or so for that setup, minus the glue.
Forum: Technical
01-31-2002, 09:24 AM
Replies: 2
Views: 875
Posted By sajackson

RE: Is 350 grain arrow ok no matter how fast the bow?

These limits are based on a 30 in. draw, if you go over 30 in draw your bow will be storing more energy due to the increased draw length, this can be damaging to the bow. The AMO puts out s chart...
Forum: Technical
01-30-2002, 09:25 AM
Replies: 6
Views: 865
Posted By sajackson

RE: Arrow Weight & FOC calculators

Thanks guys, just trying to share some of what I had written and been using on my HP-48 calculcator. It's much easier to use in a browser and it was a good project to learn web programming on.
...
Forum: Technical
01-29-2002, 06:10 PM
Replies: 6
Views: 865
Posted By sajackson

RE: Arrow Weight & FOC calculators

I think it was more of a total weight thing they were actually interested in.
Forum: Technical
01-29-2002, 01:44 PM
Replies: 6
Views: 865
Posted By sajackson

Arrow Weight & FOC calculators

By popular demand(Ok, 2 guys), I've updated all the calculators to make it so the point weight can be varied from 50 to 200 grains in 5 grain increments.
Forum: Technical
01-29-2002, 01:43 PM
Replies: 8
Views: 551
Posted By sajackson

RE: Matt/PA-Steve Jackson.... KE for the PREDATOR.

What they said.
Forum: Technical
01-26-2002, 08:48 AM
Replies: 15
Views: 1,322
Posted By sajackson

RE: WOW, alot of KE when I get my new bow.

55#,

The highest SE/PDF ratio I've ever seen Norb Mullaney state is around what JeffB said 1.5, I think that was on a Martin 2 cam highly reflexed, low brace height riser job(got like 250 AMO on...
Forum: Technical
01-23-2002, 05:20 PM
Replies: 23
Views: 18,507
Posted By sajackson

RE: I Can't get the arrows out of the target!!! :-(

Looks like that Woody's address should be;

http://www.capital.net/~spencer/
Forum: Technical
01-22-2002, 11:13 PM
Replies: 23
Views: 18,507
Posted By sajackson

RE: I Can't get the arrows out of the target!!! :-(

I carry a bar of Ivory in a fanny pack on the 3D range works like a champ. Rub a little on the shaft by the tip right before the shot, doesn't seem to affect flight at all. Works way better than any...
Forum: Technical
01-21-2002, 09:50 AM
Replies: 6
Views: 600
Posted By sajackson

RE: Figuring bow speed

pdq,

What type of cam is on your bow? Typically solo and hatchet type twin cams run around 1.45 or so for an SE/PDF ratio, but this depends also on ATA of the bow in some degree. See if you can...
Forum: Technical
01-18-2002, 11:26 AM
Replies: 2
Views: 406
Posted By sajackson

RE: Renegade Bows Wisconsin

Here's a website for them, look nice, never seen one in person though.

http://www.renegadebows.com/
Forum: Technical
01-09-2002, 06:27 PM
Replies: 4
Views: 2,478
Posted By sajackson

RE: Hoyt Striker II Shooters - Help???

Got mine pretty quiet, covered the hood with cloth camo tape, and put a sims accesory silencer on the back side, makes less noise from branches too. Did the same to a PSE 2 piece quiver with same...
Forum: Technical
01-09-2002, 08:47 AM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

FL,

The acceleration we're talking about isn't from the bow, but the wind. The amount of area will largely determine what force a given wind velocity will exert on the arrow, this force locks in...
Forum: Technical
01-09-2002, 12:34 AM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

Black Frog,

I just wanted to make clear, that I wasn't disagreeing that inertial effects be taken into account. I agree 100%. My main point above was that when viewed by itself could lead to wrong...
Forum: Technical
01-08-2002, 01:59 PM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

It describes the river analogy only to the point of ignoring everything else, assuming no FOC and no forward velocity/momentum. Your river analogy didn't consider the force of current/water over the...
Forum: Technical
01-08-2002, 01:12 PM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

The issue concerns much more than arrow mass is the reason. A better FOC may actually allow less drift for the lighter arrow due to weathervaning, although starting from zero velocity(the exact...
Forum: Technical
01-08-2002, 12:30 PM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

Not a very good analogy at all.
Forum: Technical
01-08-2002, 10:35 AM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

This is the effect of FOC where FLHunter and I disagree.

I would submit that the amount of weathervaning is more directly related to the FOC of the arrow(but a large arrow is at a disadvantage). I...
Forum: Technical
01-07-2002, 08:17 PM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

Easton's recommended combos for the ACE show; insert + point weight gives a 12-15% F.O.C. balance with Spin-Wing Vanes and 11-14% F.O.C. balance with plastic vanes.

Perhaps getting those ballpark...
Forum: Technical
01-07-2002, 10:27 AM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

55#,

It's hard to say how the 2 arrows would actually compare in all conditions, but I would think that the ACE shafts would definitely have the edge in aerodynamic resistance and therefore...
Forum: Technical
01-06-2002, 05:47 PM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

I think we're all really talking the same ranges of FOC. Easton's recommendations generally keep you pretty safe.

When I was discussing the drag connection, I think it was in relation to shooting...
Forum: Technical
01-06-2002, 02:08 PM
Replies: 29
Views: 3,106
Posted By sajackson

RE: Arrow Balance and FOC...

FLHunter and I disagree on some aspects of the FOC topic, I contend and many FITA shooters would contend(I believe McKinney has documented it) that a low FOC hurts performance in wind at those 70 and...
Forum: Technical
01-03-2002, 07:10 PM
Replies: 18
Views: 1,221
Posted By sajackson

RE: REVELATIONS! (?)

JeffB,

I really like the Topgun release, I wouldn't switch back to Winn or the Tru-Fires, believe I shoot better with the Topgun, the anchor and draw are just right.

Along the lines of the...
Forum: Technical
01-03-2002, 12:12 PM
Replies: 18
Views: 1,221
Posted By sajackson

RE: REVELATIONS! (?)

Len,

I've shot both of mine(backup) in everything from AZ desert 110 plus, to the AZ White mountains, CO mountains, CA mountains and winter desert, in the teens to single digits, never had a...
Forum: Technical
01-03-2002, 09:48 AM
Replies: 18
Views: 1,221
Posted By sajackson

RE: REVELATIONS! (?)

The first release I was ever able to comfortably use was also the Winn. That "club" jaw was rough on servings, but I wore thru 2 of the gloves also. Being able to wrap the other fingers around...
Showing results 1 to 28 of 28


 
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