RunRyder RC
 1  Topic Subscribe
WATCH
 1 page 1367 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › PUH engine question
11-20-2011 05:51 AM  6 years agoPost 1
S Crutchfield

rrNovice

Arkadelphia,Ar. usa

My Posts: All  Forum  Topic

What is the difference in a 290 PUH engine and a 290 rc pro max?
Can a 290 rc 3d pro max be used in a MinAir Spectra G?

PM  EMAIL  GALLERY  Attn:RR  Quote
11-20-2011 06:17 AM  6 years agoPost 2
marco

rrApprentice

Santa Rosa , Ca - USA

My Posts: All  Forum  Topic

In order to install an RC engine in a Spectra you will need the Helibug Spark conversion.

-Marc

PM  EMAIL  GALLERY  Attn:RR  Quote
11-20-2011 06:18 AM  6 years agoPost 3
Justin Stuart (RIP)

rrMaster

Plano, Texas

My Posts: All  Forum  Topic

The Zenoah RC engine has the pull starter and fan attached to the bottom of it. A PUH engine has no fan and the pull starter is removable. The engines have different crankcases and some internal parts are different.

The PUH engine is the closest you can get to a nitro engine and helicopters like the Spectra use the PUH format since the helicopters design is essentially a nitro helicopter converted to use gasoline.

The RC engine is what is used in most GoPeds and helicopters like the Vario and the HeliBug.

I don't remember what the "RC" or the "PU" stands for, but the "H" in "PUH" stands for helicopter. There is also a PUM which is for marine.

You can see in these pictures the differences between the two different kinds of engines. The first two pictures are of an RC engine, the last two pictures are of a PUH engine.

RC:

PUH:

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

PM  EMAIL  GALLERY  Attn:RR  Quote
11-20-2011 01:34 PM  6 years agoPost 4
Bill Clontz

rrApprentice

usa

My Posts: All  Forum  Topic

The new whiplash will be "RC" format, I have converted my spectra g to run the "RC" format so when my new whippy comes in I can just move it to the new airframe.... The "RC" version has a full circle crankshaft making it easier to get a smooth running engine, especially with the larger bores.... I am currently looking at (O'neil Brothers) long rod 30.5cc rc that produces over 7.5hp.... I am going to have my 290 3d pro max dynoed by them first to see where it is at now... then I may upgrade further... will post the results when I get them next month...

keep in mind the "rc" version you cant remove the pull starter and save that 4 oz. otherwise they weigh pretty much the same....

I prefer the "rc" for a few reasons : better cooling, no fuss with the pull start, smoother runing.. tons of accessories from the scooter and baja market. just my 2cents.

PM  EMAIL  GALLERY  Attn:RR  Quote
11-20-2011 02:30 PM  6 years agoPost 5
Justin Stuart (RIP)

rrMaster

Plano, Texas

My Posts: All  Forum  Topic

But if you've got an onboard generator, you're stuck with the pull start since the generator is driven off the starter shaft.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

PM  EMAIL  GALLERY  Attn:RR  Quote
11-20-2011 03:06 PM  6 years agoPost 6
S Crutchfield

rrNovice

Arkadelphia,Ar. usa

My Posts: All  Forum  Topic

Thanks for the info, I've been flying electrics and I'm new to gassers.
I've been looking at BH Hanson engines; 260,and 290....some say "pro" some say "pro max" and some say "3D pro max. Which engine would be a good match for a spectra G, and which engine would give me the most power, without sacrificing smoothness? Are there other brands that that would be better performers? Any Ideas?

PM  EMAIL  GALLERY  Attn:RR  Quote
11-20-2011 03:40 PM  6 years agoPost 7
Justin Stuart (RIP)

rrMaster

Plano, Texas

My Posts: All  Forum  Topic

which engine would give me the most power, without sacrificing smoothness? Are there other brands that that would be better performers? Any Ideas?
That's the $10 million dollar question. Maybe this guy knows?

There are only two manufacturers out there with a LONG history of making high quality, consistent helicopter motors. BH Hanson and TRM. There are many other manufacturers out there who claim to have some special ability to make a motor which is "smooth yet powerful", but if you're going to spend the money on a new motor, it would be best to buy one from somebody who has a long history of success with helicopter motors. Here are your two choices:

http://www.bhhanson.com/

http://www.toxicmarine.com/

Both of these engine manufacturers are named Al. You need to pick up the phone and call both of them, get to know them, get to know their history, and then decide which one of them you would like to work with.

If you Google "Zenoah modifier", you'll get 100,000+ of hits. There are lots and lots of guys out there with metal lathes and sanders and rat-tail files looking to make a quick couple of hundred bucks by tweaking a motor, but when it comes to helicopter motors, only TRM and BH Hanson have a LONG history with literally thousands of happy customers. Why risk it?

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1367 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › PUH engine question
 Print TOPIC  Make Suggestion 

 1  Topic Subscribe

Tuesday, June 19 - 1:45 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online