FF
Guru
- Joined
- Oct 12, 2007
- Messages
- 22,552
Folks are rightly concerned with fuel burn , and attempt to make guesstimates based on a Mfg. hp and prop graph.
Sadly this is a futile exercise as so much information (efficiency at various loads and RPM) is lacking.
I have always suggested to use a Fuel Map tho these are really hard to get from the engine folks.
Most folks have never even seen a fuel map, so here is a BMEP,map , about as close as you can get..
This is for a car engine , but it can be seen that there are areas to operate that are more efficient to operate than others.
For a long range cruiser , selecting power , there is no better info, IF you can obtain it.
http://ecomodder.com/wiki/index.php/...hyperbolae.png
Sadly this is a futile exercise as so much information (efficiency at various loads and RPM) is lacking.
I have always suggested to use a Fuel Map tho these are really hard to get from the engine folks.
Most folks have never even seen a fuel map, so here is a BMEP,map , about as close as you can get..
This is for a car engine , but it can be seen that there are areas to operate that are more efficient to operate than others.
For a long range cruiser , selecting power , there is no better info, IF you can obtain it.
http://ecomodder.com/wiki/index.php/...hyperbolae.png