HB .61 & .61 PDP with muffler

Price & Availability

The HB .61 is a renowned engine for durability and performance. It was used by the US Army to power target drones in the 1980's. Its light weight and high power make it a favorite for many modelers. The patented PDP ports boost the power without increasing fuel consumption. These 4 finger ports are located on the exhaust side of the baffle and introduce an additional fuel charge in a normally dead area of a loop scavenged engine design.
HB .61
HB .61 PDP
HP *
1.45 @ 16,000 RPM
1.85 @ 16,000 RPM
Practical RPM *
1800 ~ 16,000
1800 ~ 19,000
Porting Arrangement
Loop Scavenged
Loop Scavenged with PDP ports
.61 cu. in. (9.97 ccm)
Bore & Stroke
0.944" x 0.866"
Prop Shaft Thread
1/4 x 28
Piston/cylinder type
Dykes ring piston / hardened steel liner
Connecting Rod
Forged Aluminum bushed at both ends
One piece hardened Steel
Engine Weight
14.6 oz. (413 gr.)
Muffler Weight
Double Ball Bearing supported crankshaft
O-ring sealed twin needle with full fuel metering, composite body.
Carburetor neck Dia
.510" Dia
Carburetor Throat
*Specification's subject to change depending on fuel, prop, exhaust system, etc.

©2007-1998 Model Engine Corporation of America, All rights reserved.
HB is a Trademark of Model Engine Corp. of America

No part may be reproduced without written permission from
MECOA -- P.O. Box 98 -- Sierra Madre, CA 91025 U.S.A.