105x75, 5.5 low pro. nanners, helical.  Shoots great out of all my bows..custom longbow or home made self bow.
Whatever flies your arrow!  This is trad.  Go for it!
JAG/Johnny

90 x 90 helical.

Allan

offset all the way no need for helical as 4 fletch is a lot of steering  ,,  you get a fair amount of spin with the  natural shape of feathers  

I used to have 3 Jo jans when I was making arrows. I sold two of them when I stopped without giving any thought to the four fletch indexers. When I decided to try the four fletch the indexers i had were 75 X 105.  I had never tried that configuration before but gave it a try, just the same. It turned out that I liked that set up better than the 90 X 90 I experimented with in the past. Using the 75 X 105 I have achieved the best arrow flight since I started shooting in the 50's. I am not necessarily saying that is what you should do, just that it has worked the best for me with my current set up. It seems to do the same for my wife...she loves the arrow flight she gets with that configuration.

If you can put helical, why not put helical?

I kind of equate this to a bullet leaving the barrel of a gun. Spin equal stability.  Longer the projectile the more spin necessary to stabilize?
To put it simply, more spin more stability. Isn't that what we are trying to achieve?  Is there such a thing as over stabilizing?

Throw a football without spin?

I know that projectiles can be unstable.

Helical reduces velocity but at what distance?

Just some thoughts..way too much coffee this morning....

God Bless,   Pierre

90 ¤ 90 is much more pleasant to look, I think...if that matters though  

Yes as much as I can get on my AD tradlites.I just used my Jo Jan with offset clamps.

QuoteOriginally posted by Pierre Lucas:
If you can put helical, why not put helical?

I kind of equate this to a bullet leaving the barrel of a gun. Spin equal stability.  Longer the projectile the more spin necessary to stabilize?
To put it simply, more spin more stability. Isn't that what we are trying to achieve?  Is there such a thing as over stabilizing?

Throw a football without spin?

I know that projectiles can be unstable.

Helical reduces velocity but at what distance?

Just some thoughts..way too much coffee this morning....

God Bless,   Pierre

I agree, which is why I fletch my arrows helical. As far as at what distance the velocity difference is noticable, it's a lot further than I suspect most anyone here is capable of reliably killing big game.

I see no drawbacks to helical also. I do see drawbacks to not using helical...stability in all conditions. I have switched to 4 4" and love them with the helical that the Bitz provides.

SteveO, I don't want to answer for Rob but I used to shoot 3-4"x5/8" fletch with a slight offset in a straight clamp.  Basically the offset,about a quill's width is enough to spin a broadhead just fine. A straight fletch would have absolutely no offet at all and I wouldn't use that one.

Ray, The 75x105 would likely shoot just fine.  The feathers will set a little lower, but not in quite as much as with 90x90.  The only way to really know is to fletch some up and shoot 'em.  I've shot both and have been using the 90x90 for many years now.

Shooting off an elevated finger rest - with plastic vanes - 75x105 seems to be optimal.

With feather fletch 90x90, 60x120, and 75x105 ALL work well with a properly spined shaft.

Shoot straight, Shinken

I like a 90 deg. with helical best.

Straight fletch works just fine too, but I can count the number of rotations the arrow makes going to the target and it just looks weird.

I like to see a spinning ball of color going to the target and that is what helical will do for you.

Don

I use 4"shield 4-fletch rw helical on a jojan multifletcher. with the 90 degree nock receiver.
and I index the fletch so when nocked, and looking at it from the rear, it forms an 'X'.

In my opinion, if you have a well tuned arrow, helical is not needed. Straight or offset fletchings attributes are lack of noise and a faster arrow downrange. I use 4 fletch, 4 inch feathers, set slightly offset.

I've been shooting 4 fletched arrows for years. I use a Jo-Jan with straight clamps. I don't think they shoot as well as 3 fletched off the shelf, so I use a Bear Bristle rest about 1/2" above the shelf. That set up has been working real well for me.