Oh, anything over 1,000 rpm, I suppose, but wanted something near 1,200, which wasn't to noisy and the ratchet on the throttle control was either 900 or 1,400-1,500...like I said no biggie.
When the Nicads need to be recharged, I run the engine 30 to 45 minutes and the 2-1/2KW initial load is...