Prop recommendation for 90 mono

[Shane Bastick]

Anyone have some basic 'ball park" prop recommendations for a 90 mono, hull will be a 'wild thing', engine will be a CMB 90 EVO 2002 purple head engine,

thanks in advance

 

[BobLondress]

X467

 

[Craig Knight]

CoCr AL 1

 

[RC 90 Boat]

x 460 3 blade x 670 back cut ant tips rounded

 

[Shane Bastick]

thanks guys, a great help

 

[shoboat]

Shane,

We have found through lots of testing: for a Stock motor the X-467 V-Cut works GREAT!!!

If the motor has been Modified the X-470 V-Cut with a little diameter reduction is the way to go.

Also, a lot of differences with different pipe selections.

Have Fun Testing,

Mark Sholund

 

[Shane Bastick]

thanks Mark, engine will be stock

 

[sbowden21]

We have had great success with x467 & x470!

 

[Danny King]

X467 with the pipe at 11"

 

[Shane Bastick]

thankyou Danny,

I was wanting to know a ball park pipe length as well , so thankyou

 

[BigChuck]

EVO 90...13cc pipe, CMB Header, pipe at 11 1/4 for side case to tuning band....Now run the X467

The wild thing is a shallow Vee..almost flat bottom.....

Head clearance on stock bowl head needs to be high if running 60% fuel....

 

[Shane Bastick]

thankyou

 

[normlee]

When you say high head clearance, is 12-13 thou the go?

 

[BigChuck]

NO...not on a stock volume head..

but if you want to run it there...It will work..

 

[Danny King]

The stock button is fine run it at .010 to .012" no reason at all to run 60%

 

[BigChuck]

Say what you want DK....But when he burns a hole in the piston...I hope you ears Ring.

 

[normlee]

What do you suggest with a stock head for nitro %, clearance and why please Chuck.

 

[BigChuck]

The motors come set up to use 25% or less, head volume included. And yes you can run .012..if you run the lower % fuel.

My first R/C boat was a twincraft with Red head CMB...on 25%. Got lapped by the same set up on 50%....made the change in fuel and learned a costly lesson.

 

[David Ashcroft]

Mate 25% is ideal with the stock engine as Chuck said.But I ran 40% at 16thou with my stock purple 90 and it performed well .

 

[dr gary turner]

Just tested at Huntsville record trial and the ABC 2515 was excellent with my 101 Seducer long boat and Mac pipe. I think a 90 would pull it fine. Smoothed the boat out with incredible accelerate at ion.