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

[Bill Glaze]

The specific heat generated by gasoline is about twice the specific heat generated by alcohol, which, in turn is about twice the specific heat generated by nitro.  In other words, on a mass basis, nitro is a more inefficient fuel on a pure basis than alcohol, which is less efficient than gasoline. (from a volume/efficiency standpoint)
Or so my handbook stated when I was building competition engines.  Then why use nitro at all?  Well, because it generates more O2 than it needs to burn, thereby helping the other "combustibles" complete their combustion, and it's possible to run a hellacious load of nitro per cycle because of it's burn characteristics.
Bill Glaze
  ----- Original Message ----- 
  From: Vicente "Vince" Bortone 
  To: General pattern discussion 
  Sent: Sunday, December 13, 2009 8:48 AM
  Subject: Re: [NSRCA-discussion] This email list is flawed in my opinion.


  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 at 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 at 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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