4 Fletchers - which angles?

[Biggie Hoffman]

it's funny though cause I have to turn my nocks where a feather is on like a 45 degree angle to the riser to get perfect arrow flight....

[swampbuck]

So a 2 blade....LOL never mind

Good luck!!

[Terry Green]

Originally posted by swampbuck:
I'd bet ease of manufacturing has much more to do with blade placement on a prop than even distribution and your also talking about thrust vs stabalization.

Nope and nope.

[Terry Green]

Sorry Biggie...there is such a thing as 'clean air' and 'dirty air'.

Two race cars can go faster than one for the very same reasons in reverse.

[Biggie Hoffman]

Yeah but you don't have one feather  in fornt of the other but side by side. It's pure physics.
Drag is defined by surface area plus angle. How far apart the feathers are doesn't change anything unless one is ahead of the other.
As far as props go...balance must be maintained to realize maximum revolutions.

[Terry Green]

"Yeah but you don't have one feather in fornt of the other but side by side. It's pure physics."

Yep, as you don't have one prop in front of the other but side by side....for the very reasons I listed above....it's pure physics.   :D

Lets go huning....I'll bring the Krispy Kreams.  :p

[RL]

I shot 3-fletch for years and always wore out my velcro rest about every 2 weeks. Now I shoot 4-fletch 60-120 and haven't had to change the velcro in 3 months. It worked so well that I never tried other configurations of the 4-fletch.

[SERGIO VENNERI]

Sorry folks, but I gotta agree with Biggie on this one! And it ain't cause he's big and Scary.  
      I just discussed this subject with a Bowhunting friend who is also a tool and die maker. He says, that an arrow first of all with about 11 degrees of helical fletch only makes one complete turn in about 6 ft. of travel ,where as a prop would turn thousands of times in 6 ft of travel. Two totally different mediums, there is no comparison between the density of the 2 mediums, a prop turns so fast that it can displace water faster than it can move back into the prop ( cavitation) an arrow is already moving in air and not fast enough to cause a vacuum which would be(cavitation in air) .  now,having said all of this, i don't think that there's much difference in any of the 4 fletch positions except that i believe the feather wear would be greater on the 4-90's.
     N.B This is just my opinion and i'm only trying to get people to think not start an argument, this is what i love about this site!!
                Sergio

[The Whittler]

I have a Jo-Jan which you can 4 fletch by turning the nock indicator around. I don't know what the degree is (maybe somebody would know) but they didn't shot that good.

Tried the 60-120 with the Jo-Jan and they shoot great.

[The Whittler]

Forgot to ask, what fletching jig do you use for the 4 90s. Thank you.

[SERGIO VENNERI]

Alan; The Jojan does 3-120 or 4-75/105 .Also 60/120 will give you the best feather clearance on a shelf rest. I use an elevated rest and get good clearance with any pattern. Have fun with which ever you use.

[Jason R. Wesbrock]

Originally posted by The Whittler:
Forgot to ask, what fletching jig do you use for the 4 90s. Thank you.

I use a BPE.

[flatbowMB]

Originally posted by SERGIO VENNERI:
He says, that an arrow first of all with about 11 degrees of helical fletch only makes one complete turn in about 6 ft. of travel ,where as a prop would turn thousands of times in 6 ft of travel.                 Sergio

No reasonably pitched 3 or 4 blade outboard propellor will require thousands of revolutions to push a boat forward by 6 feet.  Let's do some math here.  My 16 foot inflatable with a 40 hp 2 stroke easily does 30 mph at wide open throttle (~5000 rpm).  There are 880 6 foot lengths in every mile, 30 miles is 26,400 6 foot lengths that are being covered every hour, which is 7.333 6 foot lengths every second. At 5000 rpm the prop is spinning at 83.33 revolutions every second,  which means that the prop rotates a total of 11.368 times for every 6 feet it pushes the boat forward.

What's this got to do with arrow flight?       - I have no idea, but I couldn't let that one go without some analysis.    

[Vig]

You guys crack me up with all this "physics" talk.  

I think I'm going to try some four fletch, just because they look neat.

-Vig

[brettlandon]

I straight fletch at 75x105 and have excellent results at ranges to 30 yards (my hunting limit and more).  When I lob shoot I use three fletch helical as they maintain arrow performance (certainly not my performance) out to the 130+ yard targets.  Because I straight fletch, I believe that the stabilization effect of the air on each feather is equal and consistant.  This may not be true for helical fletchings.  Of course, my PhD in physics was found in the bottom of a cereal box.    

-Brett

[the elf]

Stupid question time-----If you use 4x90 fletching do you use Helical or a straight fletch?

[Rob DiStefano]

Originally posted by the elf:
Stupid question time-----If you use 4x90 fletching do you use Helical or a straight fletch?

Helical, offset, straight - all yer choice.  Experiment!

[swampbuck]

LOL you guys crack me up sometimes

My fletch's are practically touching each other on my skinny carbon arrows...I looked from the point end down the shaft and could see the whole profile of the helical fletch on all 4 feathers

You have X"s of surface area at X deg's

straight or helical doesn,t matter either

 you only have what you have and where it is on the shaft assuming symetery doesn't matter

So now that we got that cleared up LOL and we all know that geese fly in a V shape for arrow dynamics but did ya ever notice that 1 side is longer than the other???

know why that is ????

[Biggie Hoffman]

There's more geese on one side?

[Rob DiStefano]

Originally posted by Biggie Hoffman:
There's more geese on one side?

Ya know, I've always noticed that the geese flying V is rarely uniform, always staggered ... ?