4 bladed prop suggestion

[Steven maxwell]

 Dave very good points as you know I have been running the Mintor 170 with the APC    15 3/4 X 13 RPM 6900 on muffler, it's on a Focus 1 that is right at 11 LB, even though I was sceptical of the RPM it has worked great doesn't get hot, unlimited vertical, there is a slight jump when accerlating but not near as much as the 2 blade, can't explain why but has made this plane a are dream to fly at a slower speed though out the flight it took a plane that I didn't like that much into a plane I love to fly.
 Steve Maxwell
 
David Lockhart <DaveL322 at comcast.net> wrote:
I think Joey Hayes was running the 15-11 4 blade on his 140DZ in a Partner.
 
FWIW - I use the same throttle technique in snaps no matter what prop I am running.
 
Back in the old days when 60 2Cs ruled, 4Cs were not in favor because they were different - even after the point at which it became obvious they had more power (owning to the 2:1 displacement advantage).  Change takes time, even when the change is for the better.  Many guys don't like the 3 or 4 blade prop at first, but given time to get accustomed to the differences, most never go back to the 2 blade.  And just like the 2C / 4C - the best setups and techniques for a 2 blade do not directly translate to a 4C - there is both an aclimation period and a learning curve.
 
Regards,

Dave
----- Original Message ----- 
From: Troy Newman 
To: discussion at nsrca.org 
Sent: Monday, August 09, 2004 7:12 PM
Subject: Re: 4 bladed prop suggestion


Mike,
 
14.5-12 works on the 140...also a 15-11 will load it a bit more but will work. Central has them or can get them.
 
I'm not totally sold on the 3-4B props...But I have been playing with one on  the 160DZ turns the 17-12 std APC at 8600-8800...Yesterday I was turning the 15.5-12 4B at 8800 in PHX in the heat of the day(4pm) at 113degs...and it had good power and performance....
 
Brakes are nice but it does some other things both good and bad....It seems to keep the model from coasting through things....But on the other hand spool up time is not as good....This has always been my complaint with the 3B and 4B props...Those I have seen fly the 3B successfully like Dave Lockhart...the horizontal snap-roll combos needed a different technique....Dave was throttling up during the last rotation of the snap...so that when the rotations stopped the motor was pulling and then he was pulling the power back a little in the following roll combo... I was never as good as he was at throttling during the snap. I just found the 2B props better for me in this case....I found the problem to be even worse when running the 2 strokes...But Dave to his credit made it work. However,  in the current Prelim and Finals sequences we don't have any of these horizontal snap-roll combos....A roll then snap will not be as bad....but the snap then roll was tougher with these props.
 
After flying with Quique at the NATS I wanted to do some more experimenting...I had the prop already getting dusty...Besides I moved it from CO-CA-GA-NC-AZ all in the last year or 2 and I was looking at playing a little....Besides Quique made it work very well....His model was a softer sound and quieter than the Electric.....so we are playing with it. The OS 140(EFI) on 30% nitro turns the same prop at about 7800 and still has good power for the Prelim sequence...I did not fly my friends model through the finals pattern with it....I know that my light Supreme (10.3oz) doesn't care....The overall speed management of the props are different and takes some getting used to.
 
Not sold yet but playing
 
Troy
----- Original Message ----- 
From: mike mueller 
To: discussion at nsrca.org 
Sent: Monday, August 09, 2004 3:46 PM
Subject: 4 bladed prop suggestion


 I want to experiment with a 4 bladed on a YS DZ 140. I have a Temptation. Does anyone know what size to start with? Also who stocks them? thanks, Mike


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