HB Engines
HB Engines

Made in USA with
US and German componets since 1989

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
16.04 oz. (471 gr.)
Muffler Weight
4.2 oz. (119 gr.)
Double Ball Bearing supported crankshaft
O-ring sealed twin needle with full fuel metering, composite body.
Carburetor Throat
.312" (8mm) Ø
Carburetor neck Dia
.510" Dia
*Specification's subject to change depending on fuel, prop, exhaust system, etc.