Does anyone have any experiance with HB engines distributed by Mecoa? How do they Run? What type of fuel should I use with my HB .25 rc? basicly, I want to know everything you know about HB engine line

In a small town in Germany....a child named Helmut Bernhardt was born....

(You did say "from the beginning" right?)

Haven't run a "remake" HB....the old ones were really good stuff though. Kinda heavy for their size, but the quality would embarrass many engines of today IMO.

HB was a "sideline" of sorts for "Helmut Bernhardt Finemechanik" which made movements for instrumentation. Obviously, tight tolerances were their specialty.

When Mr. Bernhardt was killed in a plane crash in about 1984, the model engine side of things was brought to an end.

...just a little trivia.

And don't leave out that Helmut Bernhardt was born "at a tender age".....

I had a 61 and a 40, both the Perry Ported versions. Nice engines for sure. The 40 was kind of "stocky", i.e. wide across the crankcase, etc.

I think Mecoa bought the tooling so I suppose the engines available now are of decent quality also.

Clair

One could hope that they're just as good.

Then again, I could buy all the same exact tools as "Norm Abrams" (Yankee Workshop) and still not approach his level of woodworking skill, so...I think there's more to it than just owning the tooling.

BUT!...perhaps we shall see.

I recently rebuilt an original HB 61 with some mecoa parts, namely rod, piston and ring. The "repro" parts fit very well, machining tolerances were excellent. The engine continues to be an excellent runner. Here is a before shot, believe me, it loooks much better now..........

I own a HB .61 and I have intalled it on a H9 p-51 mustang. The prop shaft is too short and I was hoping to machine a new one on the CNC. My problem is I cannot figure out how to remove the shaft from the engine. Can you shed some light?

I have a modern, MECOA-distributed HB .61 2-stroke and it is absolutely terrific. Powerful, smooth, reliable, and lightweight - what's not to love?

Quote:

ORIGINAL: bettungesvik

...My problem is I cannot figure out how to remove the shaft from the engine. Can you shed some light?

...Svik,


You will need some kind of a puller (gear, terminal, bearing), which will latch onto the slot in the prop-drive washer and press back against the crankshaft, to remove it from the lock-cone. There are several recent threads that have links to such equipment...

After that, undo the four bolts that hold the front crankcase to the rear and separate them (you will need to make/buy a new gasket for reassembly).

The crankshaft should be a firm push-fit in the bearings.


I would not take apart a running engine, to replace the crankshaft, with an untested replacement...

Can this short crankshaft issue, not be overcome with a special, tubular extension prop-nut, that you can machine on your CNC just the same???

Here is a recent thread on HB's:

http://www.rcuniverse.com/forum/m_8654353/tm.htm

It's difficult to search for HB since the RCU search engine won't accept 2-letter words unless you put them in quotes, like: "hb"

David

I would not take apart a running engine, to replace the crankshaft, with an untested replacement...


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True. It would be dangerous to try and do that kind of work on the engine while it was running like Dar said.

David,

Search for HB without quotes works fine on the new search engine:

http://search.rcuniverse.com/search....tecreated&q=HB

please try it

Thanks Marc! This new search engine a big improvement. Glad to see it!

David

True. It would be dangerous to try and do that kind of work on the engine while it was running like Dar said.
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That's just good comedy.....[sm=biggrin.gif]

The crankshaft on the older engines are usually shorter than what we see today. They didn't use spinners on them way back then. You can use a spinner nut instead.

Now to remove the thrust washer without disturbing the bearings, you do like they stated already, use a gear puller. The bearing spliiter works really well with this. If you plan on replacing the bearings, you can heat up the crankcase (after taking it apart some of course) and then using a brass hammer give the crankshaft tip a good wack and the thrust washer will come loose as the crankshaft slips back from the bearings.

The MECOA made HB engines are just as good as when HB made them.
I ran the 40 PDP for a long time, it was a great engine. I still have a little HB .15 and it is a sweet running little engine.

Ithink Brucercengines may have some of the old HB engines in stock, nice looking engines, Ihave been drooling over them for a while.

""When Mr. Bernhardt was killed in a plane crash in about 1984""

wow, I have a 61 NIB made in 1983,, it should be worth aaaaa say $400 LOL

Jim

My engine is stamped 0583 so it's made in May 1983.
HB is really good.

HB .61 engines were once called the "German Veco"

The early .61 engines had a different size front bearing and were very hard to find replacements. You can still find bearings for the later models and I don't remember any way to describe the difference.

Later on HB also made your PDP (Perry Directional Porting) version and later on a pretty hot version with a black head called the "Blitz."

They were very rugged and powerful engines.

What size was the early model bearings that are hard to find? The only ones Isee are 8X22X7. Thanks. Jeff

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.

Blitz,,

as I remember the Blitz is not a PDP Ported Engine and is more powerful than the PDP Engine, I believe the Blitz has a Flat Top Piston, I know (as you can see in the link) the 2 Engines have different Rings too,,

https://shop.mecoa.com/shopdisplayproducts.asp?id=109

Jim

I remember those foam delta models that were built for the military so they could save money blasting away with 30mm instead of expensive 50mm.

I think the guys from RS Radio Systems were in on that project (small orange transmitters and flight packs in the late 70's) their radios were the size of Cannon stuff at the time. The original ones used K&B/Veco .61's with the name ground off the bypass.

Hard to tell what engines were used on those target RC models over the years.

All I remember is that they were very hard to hit .

I think the idea was even if a round hit the foam wing it would just make a hole they could easily patch and keep going.

A radio or engine hit was another kettle of fish.

Dan,


I am not sure about the 'Blitz' model's porting, since I did not see one. But it had a chromium plated steel sleeve and [link=http://www.mecoa.com/parts/14/14-09/14-09.htm?id=239]the ring[/link] was a normal, pinned one.

Regarding the porting, I don't think HB ever offered a Schnürle porting in their .61, so I suppose it did have PDP... Or it would not be as powerful as it was.
I am not sure if its piston had a baffle on it, but Super Tigre did have TST (Travasi Super Tigre) + PDP in their blue-head .61...

It's hard to know... Maybe if an owner of a Blitz would care to disassemble his engine; and make some quality 'macro' photos to post here...