Laxative(sorry couldn'y help it ;) ) here are the stats for the engine from the Tower Hobbies 2000 catalog:
The .21 SE-M is ideal for small ships.
Description: .21 SE-M, Weight in oz: 10.7, Practical RPM Range: 2,500-31,000, BHP/RPM: 1.5/29,500, Retail Price: 259.99, Tower Price: 169.99
Here...