Theory of "bullet cut chopper"

[transomstand]

Can someone tell me exactly what effect this modification has?

Thanks'

Pete

[Steven]

i wish someone would tell us! :)

[sho305]

Same for me...ttt

[WATERWINGS]

?????????????????me too

[transomstand]

Enquiring minds want to know.

[THE HOGG]

Damn!! You Would Think That Somebody Would Know.. Atleast Show Pics So We Can See The Difference.. Please!!!

[Ted Stryker]

I have a Bullet cut SRX, but it looks the same as the standard issue SRX except for a little leading and trailing edge cupping... Maybe the Chopper is similar...?

[stokernick]

where's 'Fly when you need him???:confused:

[transomstand]

Ok, Nick, play nice now.


A bullet cut chopper has an area of the leading edges trimmed off straight. It would seem to reduce bow lift and carrying ability and increase rpm. That's my guess, but somebody on this board must know!

I've seen tech questions answered here in 12 minutes, this thing has floated for days without an answer. I'm starting to get a complex.

Pete

[Jimbo]

The bullit cut chopper is cut on the trailing edge. This is very similar to the Merc lightning ET prop. These props are cut this way to improve accelleration ; hole shot and mid range and still have good top speed.

[The Big Al]

Ok!

I do not know the thery but do know the result.

The Bullet cut chopper will rev easy and has less lifting.
Top end seems the same, unless your boat needs lift.

Here is a pic of the bullet cut chopperII

[The Big Al]

Here is a pic of a standard chopper with full blade!

[1BadAction]

Here goes- I'll try to explain as best as I understand it...

When the prop is moving through the water, there is sections of the blade that are creating less thrust than others. those sections are basically not of use to the forward thrust of the boat, they create extra unneeded drag in the water. Basically, what a bullet cut is trying to accomplish, is cutting off the section of the blade that isnt giving thrust, and compensating for the small amount of lost bow lift, with a cup in the tip and/or trailing edge. I have used machinest dye to mark stock choppers, and where the dye is left on the blades after a bit of running is basically what a bullet cut looks like, except for a 1/4" of the trailing edge of the blade. thats why a bullet cut needs a little bit of cup to make up for the lost lift. On some fast hulls, the lift that is lost is ok. the blade can also be cut more of less to "tune" it for an individual application. :cool: there is a multitude of other factors involved (and ways to tune a blade), but basically thats why it is done.


Big als pic looks like it has been cut some on the front, I believe a true bullet is cut ONLY on the trailing edge.

[sho305]

I looked at a glastron a guy has had for some time. It is a cvx with an inline on it. The prop is older too, does not have lots of rake like newer props and has fairly large blades There is a big flat/straight cut on the leading edge of the blade from near the hub to near the tip though. The rest of the blade is round at the tip and trailing edge much like an aluminum prop. It has some cupping and an extension on the back of the barrel about 1" long with no flair. The whole thing is rough polish marks, near grinder marks all over it. Mostly they ski with it now.

[david laser86]

Those don't look like any of the bullet cuts i've seen... That looks like a hoss copy/cut. I know of two, a big and a small eared 26 chopper. I'll try to get a pic of them. As far as how they help i'm not sure.
Dave.

[RUDERIOT]

Those don't look like any of the bullet cuts i've seen... That looks like a hoss copy/cut. I know of two, a big and a small eared 26 chopper. I'll try to get a pic of them. As far as how they help i'm not sure.
Dave.

Exactly

[Alan Power]

1... Bullet cut chopper by DAH
2... Allison cut chopper

[Alan Power]

1... Aquaholic bullet cut
2... Hoss Triton

[Alan Power]

E.T. cut chopper

[Fast Fred]

what ya got thare is a round ear clever, from 3 O'clock to about 6 O'clock is all
"pull" you get from any prop, the rest is drag

[transomstand]

Thanks for the pics Alan. I guess that's a good part of the difficulty, the definition of what these are can be different depending on who you talk to.


Pete

[Alan Power]

Pete, I saved these prop pictures to my computer and named them correctly, at least thought I did, as a reference for myself for all the styles and cuts. I saved them from reliable sources, Aquaholic, Ron Hill and others that would know their props!
But looking back over what I have saved there does seem to be conflicting opinions depending on wo you talk to :D

I would agree with Jim's theory though, they just cut off the parts that slow you down or produce undesirable characteristics for a particular hull in other words tuning a prop to a boat "generically" Allison, Bullet...etc.

Alan

[Hydropimp911]

Best type of bullet cut in my knowledge is a Lightning ET :D

[david laser86]

Thanks for the pics Allen.

[Jimbo]

A bullet cut is cut on the trailing edge!!!!!!

Don't confuse an Allison or Hoss cut ( cut on leading edge ) with the bullet cut.

Look at the picture of the Merc ET prop --- thats close to what a bullet cut looks like.

Old time racers use to put lipstic or similar material on their props to see how the water was moving over the suface of the prop. Some of it would wear off and parts would be left on the prop. They could then tell how and where the water flow was and then compare it to the boat speed. They repeated this prosess untill they got the best prop they could. Again, as was stated above, it is very small areas of the prop that really moves the boat forward. Usually the outer edges and towards the rear of the prop.

Jim

[bigboy1]

hey guys i have a orignal bullet cut chopper by props plus. it is no where near that chopped up mass i see. i will get you pics and a link for it http://http://www.propsplus.com/

[bullet bob]

Bigboy I couldn`t get that website to come up.

[arbasscrap]

Bibo got a few too many http:// in there. :p Here you go.

http://www.propsplus.com/

[crich68]

The trailing edge is cut......i'll try to get some pics for ya'll to see. It is designed to run on a Bullet which runs flat and does not need a prop with alot of bow lift. I have two, a 26 and a 28, and they are by far the best prop I've ran on my 20 foot Bullet. They are a rocket outta the hole and have excellent mid-range without sacrificing top end speed!

[bullet bob]

I have Bigboy`s 26 Bcut on my 19v rite now and it is awesome. I will try to get a pic of it for yall to see.

[Paul Nichols]

The ''Bullet cut'' that Performance Plus does is VERY different than the ''Bullet cut'' that Performance Propeller's does. I've seen several very different cuts on props that were all called ''Bullet cuts''.

Paul

[THE FAST ONE]

Pic's Of Performance Propellers-et PIC'S SCARY AIN'T THA.