RunRyder RC
 5  Topic Subscribe
WATCH
 1 page 2307 views POST REPLY
HomeAircraftHelicopterEngines Plugs Mufflers Fuel › What's the diff between OS 61 SX-H and SX-H WC ??
03-05-2008 11:26 PM  10 years agoPost 1
vinver

rrNovice

Enfield,NS Canada

My Posts: All  Forum  Topic

What makes a OS Max 61 sx-h a WC version? I looked at the OS engines website and can't seem to find any info how to identify one from the other, looks like both use the 60B 3-needle carb. Any info??
Can you upgrade a SX-H to the WC version? And what is a SX-HG ????
Just curious what engine I have, putting in new bearings and ring, both seem to be same parts for both versions.
Vince

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 11:36 PM  10 years agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

WC: Un-webbed crank, small mods to the carb. Case, head, ring, piston, and bearings are the same.

SXHG: Special crankshaft for certain German heli mechanics.

Ben Minor

PM  EMAIL  GALLERY  Attn:RR  Quote
03-06-2008 12:51 AM  10 years agoPost 3
payne1967

rrElite Veteran

uk

My Posts: All  Forum  Topic

the 61sxh /lx had the early 60b carb with 2 needles
the 61sxhwc had the 60b carb with 3 needles with a plastic/nylon insulator on the carb to crankcase fixing (i think if you have a sxh/lx the crank case is not the same as the wc as the carb hole is a different dia but all you need is the insulator to use the wc case)
the early 2 needle 60b has now been replaced with the later 3 needle 60b
the hg is for robbe/graupner, hiem, vario some are side exhaust some are rear exhaust but they all have the crank nose ground to 8mm so they do not fit the std heli clutch/fan hub (raptor/freya etc)

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-06-2008 12:41 PM  10 years agoPost 4
Kader

rrApprentice

Czech Republic

My Posts: All  Forum  Topic

Dr.Ben
Hi,
What do you mean by this term : " Un-webbed" crank, please ?
Is this a shape of rear crank part ?

JAN

PM  EMAIL  GALLERY  Attn:RR  Quote
03-06-2008 06:32 PM  10 years agoPost 5
UK Helinut

rrApprentice

Gloucestershire

My Posts: All  Forum  Topic

[quote]the 61sxh /lx had the early 60b carb with 2 needles
the 61sxhwc had the 60b carb with 3 needles with a plastic/nylon insulator on the carb to crankcase fixing (i think if you have a sxh/lx the crank case is not the same as the wc as the carb hole is a different dia but all you need is the insulator to use the wc case)
the early 2 needle 60b has now been replaced with the later 3 needle 60b
the hg is for robbe/graupner, hiem, vario some are side exhaust some are rear exhaust but they all have the crank nose ground to 8mm so they do not fit the std heli clutch/fan hub (raptor/freya etc)

This is incorrect, I had one of the very first O.S 61 SXH's and they came with the 3 needle 60B carb.
The LX did however have a two needle.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 03:58 AM  10 years agoPost 6
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

The 60B carb was NEVER shipped without an insulator and was NEVER less than a 3 needle carb.

This is an example of a webbed crank: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXANB2&P=X

This is not: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCH67&P=X

Ben Minor

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 06:01 AM  10 years agoPost 7
vinver

rrNovice

Enfield,NS Canada

My Posts: All  Forum  Topic

Thanks..and
Thanks for the info,
does WC = Webbed Crank?? World Class? My carb is the 3-needle 60B, there is an insulator piece on it in addition to the o-ring, and it seems to have the webbed crank. So just a SX-H version? Wouldn't the WC version make sense to have a webbed crank>? (which I would think may balance out better, and strengthen the crank? Doesn't seem to make too much sense if i read it correctly.
Vince

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 07:58 AM  10 years agoPost 8
Kader

rrApprentice

Czech Republic

My Posts: All  Forum  Topic

WC=World Champion version

As far as the carb, two needle carb was 60G/60H carb ,by which was fitted MAX 61 LX H Ring. This carb havn´t insulator.
I have three OS MAX 61 SX-HRing and all three was fitted three needle carb 60B with insulator. The oldest one have webbed crank (now I know, what is it - thanks Dr.Ben) and two newer (World Champion version) have un-webbed crank.

JAN

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 02:00 PM  10 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

My Posts: All  Forum  Topic

Webbed cranks are a detriment to balance in most engines. The do modestly improve the flywheel effect of the crank and to some extent power as well under the concept of crankcase "packing".

Ben

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 10:09 PM  10 years agoPost 10
vinver

rrNovice

Enfield,NS Canada

My Posts: All  Forum  Topic

To all the tuners..
Thanks Dr Ben,
I'm guessing it would pretty much be disastrous to grind off the web in some misguided attempt to WC-ify an engine- at 15-18000 RPM the balancing of the cranks must be critically precise. So how much more power does the WC give over the "standard" 61 sx-h, and is there anything needed to improve power/reliability of the standard engine?
Or is it decent enough as is?
Thanks,
Vince

PM  EMAIL  GALLERY  Attn:RR  Quote
03-08-2008 04:08 AM  10 years agoPost 11
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

My Posts: All  Forum  Topic

It is actually quite easy to grind off the web and many people have done it. Just be sure you don't nick the shaft the rod goes on. A few layers of tape around it provide some protection in case you slip with the moto tool. Like Dr Ben said this will improve the balance of the motor and allow more lube to the rear bearing. If you want to run it as is, it will be fine.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-08-2008 07:45 AM  10 years agoPost 12
DS 8717

rrProfessor

Here wishing i was somewhere else

My Posts: All  Forum  Topic

The SX carb is the same 3 needle carb as the WC but the midrange metering is different.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2008 04:47 AM  10 years agoPost 13
OldSkoolXcell60

rrNovice

Melbourne, FL, USA

My Posts: All  Forum  Topic

Anyone have experience with the OS70SX-H? I am looking for a replacement for the 60 that is currently in my X-Cell. A salesman that I spoke to today was advising me that the OS70 is somewhat problematic and I would be better served with going with the OS61SX-H WC. Any advice? Thanks in advance.

PM  EMAIL  Attn:RR  Quote
03-29-2008 06:10 AM  10 years agoPost 14
vinver

rrNovice

Enfield,NS Canada

My Posts: All  Forum  Topic

OS70
I just bought a X-cell with a bunch of Bergen upgrades, it has a OS 70 SZ-H in it, if you want a 61 SX-H WC you won't find a new one easily, they are discontinued and obsolete. Perhaps the salesman had one he was trying to sell you? Lots of used 61 class engines around, everybody seems wants to go right into 90's. I think the 70 SZ-H is still current,and available, check OS website for sure.
Cheers, Vince

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2008 10:59 AM  10 years agoPost 15
DS 8717

rrProfessor

Here wishing i was somewhere else

My Posts: All  Forum  Topic

The 70 was having problems with the piston breaking like the 50 hyper.Last i heard there were 3 different version's of the piston for the 70.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

PM  EMAIL  GALLERY  Attn:RR  Quote
03-29-2008 04:11 PM  10 years agoPost 16
vinver

rrNovice

Enfield,NS Canada

My Posts: All  Forum  Topic

Which piston/
How do you tell which piston version is in an engine? Is there a number on the piston (part number, other markings?)
Vinver

PM  EMAIL  GALLERY  Attn:RR  Quote
03-30-2008 03:31 PM  10 years agoPost 17
DS 8717

rrProfessor

Here wishing i was somewhere else

My Posts: All  Forum  Topic

I would go with a YS 61 ST2 before i would use the OS 61 or 70. It ahd more power and a better fuel system.You can still buy then new.
I dont know if you can tell the difference on the OS 70 piston,even the part number will be the same for all versions.they milled the inside of the piston top too much trying to better balance it and it;s too weak.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2008 05:10 AM  10 years agoPost 18
vinver

rrNovice

Enfield,NS Canada

My Posts: All  Forum  Topic

Lucky for me I already have a YS new in the box, does it really have more power than the OS 70? With a lot fewer around, what's the reliability reputation vs the OS engines?

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2008 06:17 AM  10 years agoPost 19
Santiago P

rrProfessor

South West, Ohio

My Posts: All  Forum  Topic

YS61 vs OS70
"what's the reliability reputation vs the OS engines?"

As good or better. The YS is smoother and makes as much power, but at a higher RPM. In general both the YS and OS make some of the best heli engines around, the YS are a limited production compared to the OS. On the 50 size, TT is joining the party with a killer high reving .52

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 2307 views POST REPLY
HomeAircraftHelicopterEngines Plugs Mufflers Fuel › What's the diff between OS 61 SX-H and SX-H WC ??
 Print TOPIC  Make Suggestion 

 5  Topic Subscribe

Monday, June 25 - 7:22 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online