[NSRCA-discussion] This email list is flawed in my opinion.

[Vicente "Vince" Bortone]

Matt, 



It will be very interesting to see your results.  I had the chance to build and fly the Abbra with ZDZ 40.  I was able to comparare the same plane with OS160 back-to-back.  Clearly the ZDZ 40 was behind in power (or power-to-weight ratio) when compared with the OS 160 when doing the Master schedule of that time.  I am sure that less fuel consumption with less BTU content means less power.  The Abbra with the ZDZ 40 was ~3-4 oz over 11 lbs.  The OS 160 Abbra was 9.8 lbs.  I am not sure now what the new gasoline engines manufactures are doing to increase the power.  I believe that an improvement in the design of gas engines is required to make it usable for pattern.  

Vicente "Vince" Bortone 

----- Original Message ----- 
From: rcmaster199@ aol .com 
To: nsrca -discussion at lists. nsrca .org 
Sent: Saturday, December 12, 2009 10:46:09 PM GMT -06:00 US/Canada Central 
Subject: Re: [NSRCA-discussion] This email list is flawed in my opinion. 


Yes that's true. When I was mixing my fuel I needed to do it by volume until I figgered what the volume weighed for each of the nitro blends I was mixing..... 30% nitro is around 10% denser (weighs around 10% more for a tankful) than 15% nitro . 

Soooo ....the guys who are running the YS not only use much larger tanks but their tanks weigh more when full than they would have running lower nitro . But YS is a dawg on lower nitro . You gotta admire YS Marketing strategy 

Yet another reason I am looking into gasoline powerplants for pattern. Gas is significantly less dense than 30% nitro blend and gas engines demand less fuel to begin with. A 320 cc tank (around 11 ozs ) will run the 30 cc engine for around 12 minutes, enough for about 1 2/3 master schedules. 



MattK 





-----Original Message----- 
From: Verne Koester < verne @ twmi . rr .com> 
To: 'General pattern discussion' < nsrca -discussion at lists. nsrca .org> 
Sent: Sat, Dec 12, 2009 11:24 pm 
Subject: Re: [NSRCA-discussion] This email list is flawed in my opinion. 




The weight of fuel is going to depend in large part on the percentage of nitro . Nitro is the heaviest component. Don’t believe it? Go to the hobby shop and pick up a gallon of 5% with one hand and 30% with the other, preferably from the same manufacturer. You’ll be surprised. I know I was when a fuel manufacturer showed me at Toledo about twenty years ago. Fortunately, pilots with glow planes are weighed without the fuel so they don’t have to worry about that… 

Verne 



From: nsrca -discussion-bounces at lists. nsrca .org [ mailto: nsrca -discussion-bounces at lists. nsrca .org ] On Behalf Of Bill's Email 
Sent: Saturday, December 12, 2009 8:16 PM 
To: General pattern discussion 
Subject: Re: [NSRCA-discussion] This email list is flawed in my opinion. 

Ed Alt wrote: 

About 0.75 oz per fluid oz. 


I just weighed a gallon of fuel I have here. It was 7.8 pounds including the plastic jig. 0.75 ounces per fluid ounce would mean the jug weighs +/- 29 ounces (1.8 pounds). 
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