Fixed vs. Mechanicals Broadheads @ 300 fps

[vadeer]

I have been told that shooting fixed-blades with a crossbow is fine as long as the bolt’s fps is not greater that 300 fps. Once the speed is greater than 300fps, the fixed blades begin to plane (usually down to the left). I don't know, maybe they plane at any speed. I would like to shoot fixed w/my crossbow but not if it is reducing my accuracy. Anyone have any thoughts or experience with this?

[briarpatch]

I shoot a Parker Tornado (330 fps) with the Red Hot arrows and Sonic Pro 100 grain fixed blade broadheads....they fly just like my field points out to 40 yards (30 is the max distance I'll take hunting)....so, it's not necessarily true that a fixed blade will always plane at over 300 fps....

[Cossack]

Originally Posted by vadeer

I have been told that shooting fixed-blades with a crossbow is fine as long as the bolt’s fps is not greater that 300 fps. Once the speed is greater than 300fps, the fixed blades begin to plane (usually down to the left). I don't know, maybe they plane at any speed. I would like to shoot fixed w/my crossbow but not if it is reducing my accuracy. Anyone have any thoughts or experience with this?

Planing has less to do with arrow speed than it's FOC and the size and configuration of the head. Large heads (like the orig. Thunderheads) tend to pull the arrow in the direction they are oriented on the shaft in relationship to the vanes. Larger vanes (4-5") tend to overcome that tendency but not entirely.
Smaller, 4 bladed heads (like Slick Tricks) tend to fly truer on arrows with relatively high FOC (16-20%) and smallish vanes like 2" Blazers and Fusion.
IMO increased speed (like above 350 fps) tends to accentuate any misalignment of a fixed head more than slower speeds, esp if FOC is marginal for crossbows.

[smokepolehall]

FOC, big BH's can & will plane but its mostly causeed by insert face run-out commonly called wobble in BH. Razor-trick by slick trick is a great BH, so are montec G5 & magnus snuffer SS