Straight Fletching vs. Helical

I have really enjoyed your arrow tuning instructions on EFOC & UFOC arrows by Troy Breeding. Also the attached presentation from Dr. Ed Ashby is a great addition.
For a long time, I have been a big fan of heavy broadheads (300 Grains and +), The only point that I do not understand is why does Ed Ashby use straight fletching for the EFOC & UFOC arrows??
I am a big fan of helical mounted arrows and do not understand the reason to change to straight fletching. I was hoping that this would be explained but can not find any explanation.
Is this explained anywhere?
Many thanks in advance for any precision on this point.
Best regards,  Bob E

Our Reply

Bob,
Thanks for your interest in our web site.
Dr Ed Ashby does touch on A&a feathers particularly in the video recorded at the P&Y convention in Dallas Texas.
If you have not viewed that section you might look at it.
Like you I have been a die hard fan of large feathers with extreme helical.  Feathers were the last thing that I have experimented with in developing UEFOC arrows . Actually changing feathers is probably the last on most experimenters agendas. Once a EFOC or UEFOC arrow is achieved it is quite common to increase the percentage of UEFOC by several percentage points with weight reduction on the rear of the arrow. This reduction can be in the form of changing  nocks, wraps or feathers  or a combination of all.  Rule of thumb is for every reduction of 1 grain in the rear of the arrow is equivalent of adding 5 to 7 grains in the front of the arrow.
Once a arrow has been tuned correctly using the bear shaft method as outlined by Troy choosing a feather height,length ,profile or helical is not a problem. In actually a properly tuned UFOC arrow flies great with out any feather. Using a UFOC arrow I have been able to  replace my high profile 5 inch feather with extreme right helical for A & A 2.5 inch long  x .5 inch high straight fletch feathers.
The straight fletch feather still has a slight natural helical from the quill of the feather but may appear to show no helical with a cursorey glance . The reasoning for straight fletch is to reduce noise and reduce drag. When used with the turbulator as discussed by Dr.Ed the A&A system works great. Some experimentation may be warrented but , I have found the 2.5 length and .5 height works the best for most.
The arrows still get rotation in flight .The direction of rotation being determined by the feather being used … right or left wing.
This rotation  is  a important consideration when chosen a bevel for single bevel broadheads.
Bob I don’t know if I answered your questions. I know if you tried the A&A system you would prove to you self what i have described
Joe Furlong …

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