SAW prop - keeping the prop intact.

[vvviivvv]

Hello all,

What are people's thoughts on the below in regard's to SAW props, specifically those in the 60+mm range and 45-50k RPM loaded? i have a fairly comprehensive prop box all done by either Andy Brown or Brian Bauss so they are about as good as it gets.

I have been talking with a friend in Germany who really struggles to make a full pass with ABC props and they have to use steel props as that's the only thing that takes the forces involved... this isn't a thread at bashing there props they are really at the top of the game when it comes to this stuff.

Is there any specific prop with more hub / blade thickness (i know thinner blades are better)

What are peoples thoughts on getting something the below..

The abc range for twins in the higher sizes is a little limited,

What are people's thoughts on either:
2615-17-45 (66mm) cut to 60,
2716-15-50 (69mm) cut to 62mm
2814-15-50 (71mm) cut to 62mm
2816-15-50 (71mm) cut to 62mm

[donhuff]

I have used ABC props in the 55,000 rpm range on saw passes and they hold up ok IF they have been hardened. Stock ones are to soft and the blades will bend forward of the first pass at that power/rpm level. All of mine have been reworked by Brian Bauss.

[autolex]

Probably not what you're looking for but there are some CNC hardened props too: https://www.offshoreelectrics.com/pr...=cnc-6314350-h

[lohring]

I'm working on 3D printed custom props in 17-4PH stainless. They are considerably less expensive in small quantities than investment cast props. I need to fix my Fusion 360 "program" to design progressive pitch props. I plan to try the first set of helical pitch props against simi;ar ABC props this season.

Lohring Miller

20241108_101049.jpg

[vvviivvv]

Yeah all my SAW props are from Brian or Andy B or some top guys in Germany.

However i've never span a 65mm prop at 50krpm yet, my setup is 14s, 1000+kv motor in the 20KW range.

I will upload a pic, i have managed to source a 70mm set of Graupner steels that will be cut down to 60 ishmm increasing the pitch to around 1.5

[vvviivvv]

This is what im trying to avoid...

I have a set of custom graupner K series on order that are stainless steel. they will be reduced from 70mm and have a pitch of around 1.5 in the end.


We are also going to do a 2515 cut to 58mm. the problem is the lift characteristics that get altered as we start to cut too much.

[vvviivvv]

These are some 2716 i have now that are reduced.



and some 2814


They are from the top guy in germany and have 240km/h+ passes on them