Ed,

There are special circumstances. I would think yours is indeed one of them.

UAV's are designed around range, payload, stealth, and weight. Essentially following a law of minimums. It's a fine balance, especially with the smaller ones. A Predator, Hunter, or Global Hawk have much more latitude on what they can carry versus what they weigh. Model engines are indeed most suitable for use, as proven by 3W, DA, and Herbranson thousands of times over. There are a couple of others, but not as well known in the U.S. The company I work for purchases more of a certain manufacturer's engines in a month than 100% of the rest of the hobby industry combined...worldwide, and has been doing so for a very long time. Other manufacturers have a similar situation. The reason for that is because they work so well for the application. When you fly missions that last 10 plus hours on minimum fuel you want a strong, reliable engine that has the endurance to go the distance and bring it home again, over and over. The better modeling engines have exactly that ability. That's not to say the uav industry is locked into specific manufacturers. We're always looking for a better mousetrap.

BTerry,

Thank you

trixer,

Follow the directions on the bottle. Anywhere in between the ratios of 32 and 50-1 with the H1R will be fine. With the MC-1 go with 50-1.