HB engines??
03-22-2011, 12:44 AM
#26
Senior Member
RE: HB engines??
Dan,
The Blitz differed externally from the standard HB.61PDP, by having a black cylinder-head and the PDP lettering on the left-side engine bearer was black, rather than red...
The Blitz clearly had PDP. The question is if it had something other than cross-scavenging and a baffled piston.
I don't think it did; just more exhaust timing and a longer blow-down period, to better exploit a tuned-pipe's power boost.
EDIT: Improvement.
The Blitz differed externally from the standard HB.61PDP, by having a black cylinder-head and the PDP lettering on the left-side engine bearer was black, rather than red...
The Blitz clearly had PDP. The question is if it had something other than cross-scavenging and a baffled piston.
I don't think it did; just more exhaust timing and a longer blow-down period, to better exploit a tuned-pipe's power boost.
EDIT: Improvement.
03-22-2011, 03:42 AM
#27
RE: HB engines??
I think I have some Peter Chin engine tests around here someplace, I'll see if there are any HB .61 tests.
In the meantime, here are a few photos of various HB's.
In the meantime, here are a few photos of various HB's.
03-22-2011, 04:06 AM
#29
Senior Member
RE: HB engines??
Dan,
All three engines in the photos you posted, seem to have a separate, bolted-on front end...
Are you sure about what you wrote regarding the American-made Veco/K&B?
Only the K&B #6550 (see photo) seems to have a one-piece crankcase...
All three engines in the photos you posted, seem to have a separate, bolted-on front end...
Are you sure about what you wrote regarding the American-made Veco/K&B?
Only the K&B #6550 (see photo) seems to have a one-piece crankcase...
03-22-2011, 04:35 AM
#30
Senior Member
My Feedback: (14)
RE: HB engines??
The immediate predecessor to the K&B 6550 had a one piece crankcase as well.
A while back, I went on a collecting spree of HB engines. Mostly .50, .61 PDP and one .61 Blitz. None are in like new condition, but they have some possibility of running well with some cleaning and TLC. I haven't had a chance to play with them since I bought them for various reasons. I need to build another Bridi or Great Planes Trainer Sixty as a test bed airplane. Either version suffices well. These models have the fully symmetrical airfoil and are not the later flat bottomed airfoil aircraft that is sometimes mistakenly called a Trainer Sixty.
My previous test bed rendition of a Bridi Trainer Sixty was always criticized as being too hot for a beginner to handle. That, of course, depends upon the amount of control throw, the balance point's placement and the throttle setting.
One day, just for kicks, I fitted the nose of the Trainer 60's Edson Adjustable Engine Mount with an HB .40 PDP (red lettering). You never flew a trainer with such a terrific match of power to weight. What surprised me was how lively the model was and yet how docile it was on low rates. Truly a fantastic combo. My HB engines have always been excellent performers.
Ed Cregger
A while back, I went on a collecting spree of HB engines. Mostly .50, .61 PDP and one .61 Blitz. None are in like new condition, but they have some possibility of running well with some cleaning and TLC. I haven't had a chance to play with them since I bought them for various reasons. I need to build another Bridi or Great Planes Trainer Sixty as a test bed airplane. Either version suffices well. These models have the fully symmetrical airfoil and are not the later flat bottomed airfoil aircraft that is sometimes mistakenly called a Trainer Sixty.
My previous test bed rendition of a Bridi Trainer Sixty was always criticized as being too hot for a beginner to handle. That, of course, depends upon the amount of control throw, the balance point's placement and the throttle setting.
One day, just for kicks, I fitted the nose of the Trainer 60's Edson Adjustable Engine Mount with an HB .40 PDP (red lettering). You never flew a trainer with such a terrific match of power to weight. What surprised me was how lively the model was and yet how docile it was on low rates. Truly a fantastic combo. My HB engines have always been excellent performers.
Ed Cregger
03-22-2011, 07:44 AM
#32
RE: HB engines??
ORIGINAL: DarZeelon
There was a model of the HB.61 engine that was used to power military target drones.
It had only a rear bearing installed; i.e. no front bearing was used in it and a bronze bush was there instead.
The only front ball bearing size listed for this engine, is a 608Z, single shielded, 8x22x7 mm.
There was a model of the HB.61 engine that was used to power military target drones.
It had only a rear bearing installed; i.e. no front bearing was used in it and a bronze bush was there instead.
The only front ball bearing size listed for this engine, is a 608Z, single shielded, 8x22x7 mm.
03-22-2011, 09:00 PM
#33
Senior Member
RE: HB engines??
ORIGINAL: blw
Hi Dar. Some models of the drone HBs did have front bearings because I have two of them. I think this is an exception to normal procurement though, and my good fortune.
Hi Dar. Some models of the drone HBs did have front bearings because I have two of them. I think this is an exception to normal procurement though, and my good fortune.
Yup!
Lucky you, Barry.
03-30-2011, 02:45 PM
#34
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RE: HB engines??
When I was a teenager (about 1986) I flew Q-500 races with my local club just for fun and bragging rights, nothing real competitive, Everyone in the stock .25 class could run OS .25fp's or the enya or any of the stock engines from STor fox or K&b. Anyway I got this HB.25 in an auction and stuck it on the front of my Scat cat Q-500 racer. MAN! i ran circles around the other guys, won every race I entered. the guys in the club looked at the engine and decided it was ok but theyaskedme to move to the .40 class races. Well I won most of those as well, until guys started showing up with Nelsons and YS engines. Fun while it lasted, and that engine was light and powerful for it's size, probable the nicest engine I have ever run, didn't have to fiddle with it, just gas and go!
