I have a couple of 1970ish NIB HP 40 F engines and would like some feed back as to their performance for stunt.  They are small, light, and very powerful, but I have no Venturi for them.  Both have serial numbers etched on the bottom of the motor mounts.

Thanks for any help,
Steve

Excellent engines!!!! Billy ran these. the Hunt's ran them. Many others in the N.E.

BUT....

They need work. There were some p/s's around for a while created with timing for stunt runs.

Yes. Very light, and very strong.

Talk to Randy first


Ward-O

Pilots all over the US and the world used these in a 4-2 run many times, I setups about 80 of them for US pilots, many for tuned pipes running a 4-2 cycle, people used anything from 12x5W Revups to 11.5 x 4.5 CF props, 11 x 4 3 blades and many other combos
By the way they made a F=front intake and a R =rear intake in these 40s,
The were made in steel sleeve alum piston ringed and ABC ring versions for the Gold Cups, and later I had made ,true ABC setups that were ringless for many the many I setup for people.
I have lots of parts, and a few whole engines for the HP40
Bill Werwage used one in his USA-1, Pilots like Bob McDonald used them in later piped airplanes

I still get them in today to setup or rebuild for pilots.
MECOA has bought the company and owns them now

Randy

HP were and still are, respected producers of ammunition. They got into model engine production via engines for target drones for the military. The output of engines dwindled and were a tiny fraction of HP's total production. MECOA just purchased the model aircraft part of the business. The rest of the HP company is still churnring out ammunition by the containerload as far as I know.

Regards,

Andrew.

P.S. I have a NIB HP40 with R/C carb. I often wondered if it were any good for stunt, seems it might be after all!

Right They did not buy the weapons part of the business, just the model engines,  and not only did they buy the HP engine line,  they also bought HB engines, those 2 get confused a lot when people look for parts

Randy

How about brodak's legacy 40?
Great model, flies very well.

Marcus

Here are a few pics of my engines.  I have 2 NIB and 1 that is well used.  I don't want to sell them, but I need a venturi and nva for each of them.  I would, someday, like to put them in a good stunter and I'm not sure what plane they would be good in.
Steve

Hi Steve,

Give Randy a call, he is very familiar with these engines and can supply venturis and NVAs.
(no I do not have a business connection with Randy. )
 
It would also be a great idea to check with him about setting them up for actual stunt runs.  Then you will have a couple of great engines that will serve you for many years.

Models up to about 600 sq. in. should be no problem with these engines.

BIG Bear
RNMM/AMM

Hi Steve
What you have there is the old Silver Stars , The ones you have will have to have the non finned heads replaced with finned head , They will run for stunt much much better with the finned heads, They most likley will not work very well for you with the heads on them now, Unless you run a straight high RPM 2 cycle.

Randy

Hi Steve
What you have there is the old Silver Stars , The ones you have will have to have the non finned heads replaced with finned head , They will run for stunt much much better with the finned heads, They most likley will not work very well for you with the heads on them now, Unless you run a straight high RPM 2 cycle.

Randy

Hi Randy,

Is it true that the K&B #4011 (.40) head is a bolt on fit?

Thanks!
Bill

Hi Randy,

Is it true that the K&B #4011 (.40) head is a bolt on fit?

Thanks!
Bill

Well Bill   since the K&B piston has a large baffle on it that the head must clear I think it would be better to have a head that fits right, The HP heads are still  available, I may have many of them

Randy

Hi Steve

I do have the heads and NVA and  Venturies for the HPs, I will send a PM with cost

Randy

These HP's were really popular in the Detroit area in the early mid 80's.  Bob McDonald, Fred Tellier and others used them.  The early 80's Bob McDonald Flying Models plans like the Aquilla and Ceres used HP's.  At that time some used them because it was felt that they put out as much power as the ST 46 and could use lighter lines.  I think Art Adadmissin did some work on these at that time.  Bobs planes were I beams about 620 square inches in area and probably around 50 ounces.

Based on some old magazines that I have somewhere I believe that Bill Werewage used the HP 40 in the Perequet at the world championships around that time frame (early 80's).  The plane looks like a Juno but I think it is Ares sized.

Hi Joseph,

You are correct that Billy used the HP in his Perroquet.  He also mentions a HP as a powerplant for the Juno in the FM construction article.

Robby Hunt used the HP in his Europa, which he won a few NATS with in Jr/Sr.

BIG Bear
RNMM/AMM