[NSRCA-discussion] Prop for 1.40 DZ??

[Troy A. Newman]

Mike,

Yes the 18.1's are great I have been running them since we discussed it back 
in 2005. On the 140DZ I still feel this is too much load. The RPMS will be 
under 8000 and this is about the same load as a 17-12 std or maybe the 
17-12W

The 140DZ will be finicky at this rpm and not make the best power. Run it at 
8200-8300 with a 16.5-12W and it will be a beast and also quieter on the 
sound meter.

Just for info, most of the Japanese fliers run the 16.5-13W on the 170DZ on 
20% nitro. I by the way am running a 18.1 that has been modified on my 170DZ 
and its very quiet and tons of pull and brakes. The motor is detuned a bit 
and really likes the setup.

I personally feel the RPMS should be kept higher than some folks run them. 
If you have trouble with noise then after its setup and running at the 
8400rpm then travel volume it back to about 8100 and you'll never know it 
was dialed back. It will be smooth, tons of pull and make noise without 
issue.


Georgie, on the 140FZ or Sport and even the 140L and 30% nitro a 16-11 is 
pretty good also the 15-12W is a good prop.


Troy



----- Original Message ----- 
From: "Adam Glatt" <adam.g at sasktel.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Monday, March 12, 2007 10:39 AM
Subject: Re: [NSRCA-discussion] Prop for 1.40 DZ??


>I went through the phase of running big props on the 140DZ.  I then
> switched to smaller props and liked them more.  Try a 15.5x12W and let
> it rev (8600-8900).  No, it won't make noise, but I don't think a 140DZ
> has ever made noise without cheating or limiting throttle travel.
> -Adam
>
> Troy A. Newman wrote:
>> Matt,
>>
>> the 17-12W is way too much prop for a 140DZ
>>
>> Run the engine between 8200-8500 and you will get the best performance
>> from it. On the 140DZ's Insane power is 16-12. The 16.5-12W is also
>> good if you are getting a little too loud. The 17-10 standard might be
>> good, but a bit loud. I would look at the 16inch props.  The 17-12's
>> will pull the RPMS down too low and below 8000rpm. this loads the
>> engine too much its designed to run at higher rpm over 8000...you want
>> to be over 8200 for sure.
>>
>> I know guys run the bigger props and don't have trouble but usually
>> they complain it doesn't have the power they want. Then they stick a
>> good prop on it and it goes like stink.
>>
>> Depending on the fuel you have chosen to run the  prop will vary. If
>> you are running 30% Heli then you might get away with a 17-12 regular.
>> the 17-12W is a bit more load and I only have used this on the 160dz.
>> If you are trying to run some 20% nitro you need to really back off on
>> the prop. Follow the rule of RPM above and keep the engine happy in
>> the 8200-8600 range and it will not only run better with more
>> performance but it will live longer too.
>>
>> The 18-10s are the same way. These are a bit too much load on the
>> 140DZ to get the good power. The engine is setup to run at a certain
>> RPM. If you run it there it will be equal power to the 2 stroke 140's
>> and in most cases more. If you try to load it down to 7700 like guys
>> do to the 2 strokes you will not keep up. As far as power pulling the
>> model in the air the DZ will have more if you run it at the right RPM.
>> 4 stoke vs 2 stroke is a different gear in the car. Run the engine at
>> the right RPM and it will make more than you need even for a heavier
>> model.
>>
>> troy Newman
>>
>>     ----- Original Message -----
>>     *From:* Matthew Frederick <mailto:mjfrederick at cox.net>
>>     *To:* nsrca-discussion at lists.nsrca.org
>>     <mailto:nsrca-discussion at lists.nsrca.org>
>>     *Sent:* Monday, March 12, 2007 7:49 AM
>>     *Subject:* [NSRCA-discussion] Prop for 1.40 DZ??
>>
>>     I'm currently running a 17x12W on my 1.40DZ but I'm not getting
>>     the vertical performance I would like. I was wondering what prop
>>     size I should try? I've considered an 18x10. Any thoughts?
>>
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