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Author Topic: FOC issue.  (Read 6904 times)

Offline RadSav

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Re: FOC issue.
« Reply #15 on: July 02, 2013, 12:39:38 AM »
340's will only make the problem worse.  Besides being worse on FOC it is not recommended for your current setup.  Even the 5575's are slightly on the stiff side.

But I have a good idea!  Let's use the correct math  :dunno:

AMO is now the preferred method and the one I use.

Archers Advantage says 11.3%
My math says 11.73913%

Funny that the crazy article with the guy that thinks fletching actually will "steer" the arrow has the same math as I use.  If you use their calculator it too says 11.73913%

17.75/28.75 is 0.6173913 - .5 = 0.1173913 or 11.7%
or 3.375/28.75 = 0.1173913 or 11.7%

Perhaps trying to do math while dehydrated and recovering from a hangover is not advisable.
« Last Edit: July 02, 2013, 12:52:44 AM by RadSav »
He asked, Do you ever give a short simple answer?  I replied, "Nope."

Offline Smossy

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Re: FOC issue.
« Reply #16 on: July 02, 2013, 12:52:35 AM »
340's will only make the problem worse.

But I have a good idea!  Let's use the correct math  :dunno:

AMO is now the preferred method and the one I use.

Archers Advantage says 11.3%
My math says 11.73913%

Funny that the crazy article with the guy that thinks fletching actually will "steer" the arrow has the same math as I use.  If you use their calculator it too says 11.73913%

17.75/28.75 is 0.6173913 - .5 = 0.1173913 or 11.7%
or 3.375/28.75 = 0.1173913 or 11.7%
Ok so I screwed up somewhere then I take it. Going to have to look into it more untill I achieve the same foc you listed. I want to be able to get this down.

Basically Im sitting at 11.7%?
One touch of nature makes the whole world kin.

Offline RadSav

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Re: FOC issue.
« Reply #17 on: July 02, 2013, 01:49:09 AM »
Weight distribution of field point profiles and broadheads is too inconsistent to use method 2 with any accuracy.  You can hedge your bets and divide the differences, but as a guideline AMO is the best for consistency.   If using method 2 with broadheads shoot for 10% and if AMO shoot for 12%.

One of my pet peeves is when smart people say that fletching will steer the arrow.  I'm sorry but fletching possesses no intelligence. So if by some act of miraculous intervention it did start to steer an arrow where might one expect it to steer it to?  I won't be placing any bets that it is anywhere near the place I want it to go.  So I would rather just chose the arrows path before hitting the trigger and then let energy, friction and gravity do the rest without relying on divine intervention.

While fletching does assist sectional alignment of the shaft to the targeted flight path and that job is made easier when FOC gives additional leverage to the arrows mass it is the energy stored within the mass that really makes the difference.  More mass in the front the more stored energy in the front.  Now that arrow has more positive energy in the front half and the fletching is applying more negative energy (drag) in the back. 

It's like taking a limp piece of string.  It has no memory, no spine and no directed path of energy transfer.  You throw it forward and it remains for the most part in the same shape it was in your hand.  Only manipulated in form by friction.  Now add energy/mass to one end by tying a fishing weight to it.  Once thrown that weight will hold positive energy.  Now tie a small lightweight parachute to the other end of the string.  When thrown this will create more drag than it's mass holds positive energy thus creating a negative force of energy.  When thrown the two opposing forces will take the once limp spineless string and pull it tight and straight within the targeted path of the throw.

Now imagine if the parachute held the same mass as the weight in the front.  The parachute shape would then loose energy faster than the weight in the front, but the tension upon the string between the two areas of equal mass (weight) would be lost.  It would still fly better than throwing the string with no added mass at all, but the result would not be nearly as pronounced as it was with the majority of mass (positive energy) in the front and an opposing force with leverage in the back.
He asked, Do you ever give a short simple answer?  I replied, "Nope."

Offline demontang

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Re: FOC issue.
« Reply #18 on: July 02, 2013, 11:52:54 AM »
Radsav your the man  :tup:  I can only hope ill get to where you knowledge level is

Offline Smossy

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Re: FOC issue.
« Reply #19 on: July 02, 2013, 12:12:45 PM »
Weight distribution of field point profiles and broadheads is too inconsistent to use method 2 with any accuracy.  You can hedge your bets and divide the differences, but as a guideline AMO is the best for consistency.   If using method 2 with broadheads shoot for 10% and if AMO shoot for 12%.

One of my pet peeves is when smart people say that fletching will steer the arrow.  I'm sorry but fletching possesses no intelligence. So if by some act of miraculous intervention it did start to steer an arrow where might one expect it to steer it to?  I won't be placing any bets that it is anywhere near the place I want it to go.  So I would rather just chose the arrows path before hitting the trigger and then let energy, friction and gravity do the rest without relying on divine intervention.

While fletching does assist sectional alignment of the shaft to the targeted flight path and that job is made easier when FOC gives additional leverage to the arrows mass it is the energy stored within the mass that really makes the difference.  More mass in the front the more stored energy in the front.  Now that arrow has more positive energy in the front half and the fletching is applying more negative energy (drag) in the back. 

It's like taking a limp piece of string.  It has no memory, no spine and no directed path of energy transfer.  You throw it forward and it remains for the most part in the same shape it was in your hand.  Only manipulated in form by friction.  Now add energy/mass to one end by tying a fishing weight to it.  Once thrown that weight will hold positive energy.  Now tie a small lightweight parachute to the other end of the string.  When thrown this will create more drag than it's mass holds positive energy thus creating a negative force of energy.  When thrown the two opposing forces will take the once limp spineless string and pull it tight and straight within the targeted path of the throw.

Now imagine if the parachute held the same mass as the weight in the front.  The parachute shape would then loose energy faster than the weight in the front, but the tension upon the string between the two areas of equal mass (weight) would be lost.  It would still fly better than throwing the string with no added mass at all, but the result would not be nearly as pronounced as it was with the majority of mass (positive energy) in the front and an opposing force with leverage in the back.
Sometimes I think you just like to type type type Rad lol. Your signature fits you perfectly.
lmao.

Smossy - So Im at 11.7% Foc
Radsav - Yes.


Im not even sure what weight my bow is set at anymore, or what my actual draw length is... Ive had so many numbers, and so many changes going through my head Im going to have to find out all over again.
One touch of nature makes the whole world kin.

Offline BULLBLASTER

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Re: FOC issue.
« Reply #20 on: July 02, 2013, 01:52:20 PM »
Rad is full of wisdom with all things archery.
Smossy all of those numbers and measurements really don't matter all that much in the real world. It is most important that the bow fits you and is a weight that you can easily shoot. The arrow weight is somewhat important due to laws... draw weight I guess too. Most arrows with a insert and a 100 grain or so tip will have adequite foc. The only time I had it affect me by being off was when I was trying to set up for maximum speedwith a fat target shaft for 3d. A 50 grain glue in tip does not weigh much more than a pin nock bushing and vanes.
Life is much easier if you just focus.on shooting and don't worry about the rest unless something doesn't work.   :chuckle:
Good luck!

Offline RadSav

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Re: FOC issue.
« Reply #21 on: July 02, 2013, 02:45:15 PM »
Sometimes I think you just like to type type type Rad lol. Your signature fits you perfectly.
lmao.

Smossy - So Im at 11.7% Foc
Radsav - Yes.

 :) >:( :chuckle:  I opened the link posted to try and figure out your math.  Then I made the mistake of reading the entire link and the mention of "steer the arrow" caught me wrong as usual.  The author is definitely well written and smart, but it just drives me a little crazy sometimes.

I agree with Bullblaster!  Sometimes life is much easier if you just shoot and have fun.  Seamheads like me are rarely ever as happy with their gear as those who see it as a stick and a string that shoots another stick.  There is a reason my family and friends call me a fun sucker ;)
He asked, Do you ever give a short simple answer?  I replied, "Nope."

Offline Smossy

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Re: FOC issue.
« Reply #22 on: July 02, 2013, 04:35:08 PM »
Sometimes I think you just like to type type type Rad lol. Your signature fits you perfectly.
lmao.

Smossy - So Im at 11.7% Foc
Radsav - Yes.

 :) >:( :chuckle:  I opened the link posted to try and figure out your math.  Then I made the mistake of reading the entire link and the mention of "steer the arrow" caught me wrong as usual.  The author is definitely well written and smart, but it just drives me a little crazy sometimes.

I agree with Bullblaster!  Sometimes life is much easier if you just shoot and have fun.  Seamheads like me are rarely ever as happy with their gear as those who see it as a stick and a string that shoots another stick.  There is a reason my family and friends call me a fun sucker ;)
:chuckle: your no funsucker. Ug ug choot stick with stick and string
One touch of nature makes the whole world kin.

 


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