> For those who have larger engines, what do you think >your takoff distance would be off of a grass field and be >able to easily make it over 60 to 70 feet tall trees? >Larry H. +++++++++++++++++++++++++++++++++++++++++++++++
As no one else has posted I'll throw out some numbers for you to consider. These numbers are based on a KR of reasonable weight, 650 lbs or less with 100 honest h.p. My first question would be "are there trees at both ends"? On grass I wouldn't count on getting airborne in less than 1000 feet as the conditions of the grass can vary greatly. Four seconds from lift off to establish a 75mph climb of 1000 fpm and you've used 1400 feet. You said you wanted to "easily" clear the trees so assume you want to be at 90 feet altitude at the tree line. That will take an additional 650 feet at 110 fps (16 vertical fps )so you've used a shade more than 2000 feet. That's assuming you did everything right, cool temps, etc. Light weight, lots of power, and plenty of drag for landing and 2500 feet might be enough. It depends on your comfort level. Some might say this is a bit conservative but I just hate putting "pucker wrinkles" in the seat cushions. Personally, with my overweight pig, tired and over-propped 0-200, and 8 inches shorter than stock wings, I wouldn't fly in to a strip of less than 3000 feet that had 70 foot trees on the end. Then only if I could zig or zag around them on take off or landing. Larry Flesner
