I've shot both and settled on the 90x90.  Both work well and I doubt that you could find any difference accuracy wise.

A bit of history: 4-fletch goes back many years, I've seen it pictured as far back as the 50's, always 90x90.  75x105 showed up with compounds to give better cable clearance.

4 x 90 here-Hap

75/105 here

90 has worked great for me

I use both and cant tell the difrence dont think il ever go back to 3 fletch

60/120 or 75/105 or 90/90 - don't matter, pick one or all and try 'em out.  most of mine are 75/105 though i do use 90/90 sometimes.  i only do a 4-flech low profile banana shape.  all my 3-fletch are big custom burnt shields.  it's all good!  :cool:

Here is a smidgen of archery history regarding 4 fletch.

When plastic fletching first appeared it was on the target scene (FITA)where distances shot were out to 90 meters.

A guy named Max Hamilton introduced his plastic fletch and it was tiny and made of very hard and brittle plastic. Four fletch gained popularity.

Often when a bad release was made or the bow was torqued a little the fletch would make contact with the bow in passing.
This most often resulted in the hard plastic fletch shattering leaving the arrow to go down range with less or even no fletch... not so good for accuracy.

75x105 became popular for the increased clearance it allowed. This all occurred before the compound bow was a twinkle in Mr. Allen's eye.

Those little plastic fletchings also spawned the flexible rest and cushion plunger and soon lead to softer plastics being used for fletching.

I've been using 4" 4 fletch alternating chartruse and orange feathers, shows up like a beacon in flight.

Forgot to add, it does look cool and no cock feather.

Looking for advice.  I use three 4" feathers with 48 lb pull.  Arrows fly straight.  Thinking about trying four 3" fletching.  Seems like it should work just as well with the amount of surface area guiding the arrow.  Anybody tried this?

This stuff is so good! I'm glad I started this discussion. Thanks for the bit of history Charlie!!

I think archery would be much better off today if Mr. Allen had not had the twinkly eyes, but that's just my humble opinion.     :D

QuoteOriginally posted by Rob DiStefano:
60/120 or 75/105 or 90/90 - don't matter, pick one or all and try 'em out.  most of mine are 75/105 though i do use 90/90 sometimes.  i only do a 4-flech low profile banana shape.  all my 3-fletch are big custom burnt shields.  it's all good!    :cool:  

Rob, how long are the. Bananas you use?  I see some choppers to make them 5 3/4 but not sure if that's the standard for low profile.

Hey Danny... I switched to 4 x 90 and it has improved my arrow flight and during hunting, I don't have to find the index

Hi Steve -

That's what I was thinking about doing for my hunting set up this fall. May not improve my hunting, but the arrow flight should be pretty good!

 

Done both. Both fly well. Prefer 4 X 90 for the symmetry of it all.

For the last 12 years I've used 4" 75 X 105. Can't think of a reason to change.

QuoteOriginally posted by TaterHill Archer:
 

QuoteOriginally posted by Rob DiStefano:
60/120 or 75/105 or 90/90 - don't matter, pick one or all and try 'em out.  most of mine are 75/105 though i do use 90/90 sometimes.  i only do a 4-flech low profile banana shape.  all my 3-fletch are big custom burnt shields.  it's all good!      :cool:    

Rob, how long are the. Bananas you use?  I see some choppers to make them 5 3/4 but not sure if that's the standard for low profile. [/b]

for carbons, a tad over 4" in length for a lo-profile 75x105 4-fletch.  

here's how to convert a large hi-profile banana to a lo-profile shorter length ...

mod yer banana chopper!

Scott, I've made arrows for others using 3" four fletch and they have all been very happy.  As long as the arrows are well tuned to the bow it is enuf feather.

i think it's Important that a hunting arrow carry as much fletching surface as possible, and be helical, all to aid in accomplishing two things ... [1] get the shaft to straighten out from paradox as quickly as possible, and [2] to steer a broadhead as best as possible.  

though i've used a 4" lo-pro banana offset 4-fletch with good hunting results, imo that type of fletching isn't gonna be as "consistent" as a 5.5" hi-pro shield cut 3-fletch with lotsa helical.  jmho.

I like 4x4" at 90 but I have never tried the other.