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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › YS 91SR BACKPLATE SCREWS
04-07-2010 10:36 PM  8 years agoPost 1
RACER7696

rrApprentice

Ma

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Anyone know what the thread pitch is on a YS 91 backplate screw. I need to find some extras

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04-07-2010 10:41 PM  8 years agoPost 2
z11355

rrMaster

New England

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they're just basic M3x0.5 SHCS

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04-08-2010 01:39 AM  8 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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If they're no different than the 91 ST screws, then they're 3.5x.6.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-08-2010 01:55 AM  8 years agoPost 4
Pulento

rrVeteran

CHILE

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They are no M3 bolts. More like M3.5 or some imperial measure.

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04-08-2010 02:00 AM  8 years agoPost 5
Saint728

rrProfessor

Honolulu, Hawaii

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You can buy them here. http://www.ronlund.com/Merchant2/me...uct_Code=YS1070

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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04-08-2010 02:00 AM  8 years agoPost 6
z11355

rrMaster

New England

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I obviously stand corrected. really surprising they chose 3.5; seems like overkill

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04-08-2010 03:06 AM  8 years agoPost 7
Dr.Ben

rrMaster

Richmond, VA, USA

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Actoooooally, the use of 3mm backplate hardware is a comparatively new thing in 60-90 sized engines. OS used 3.5 mm on all of their 60-91 sized heli engines prior to the SZ and HZ series. Among other things, the 3mm hardware is lighter and takes up less physical space.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-08-2010 12:03 PM  8 years agoPost 8
z11355

rrMaster

New England

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the 3.5mm SCHS take the same wrench as the 3 as I just noticed when I dug an old CSpec out.

Perhaps they went to 3 when they started going to O-ring gaskets instead of paper.

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04-08-2010 06:26 PM  8 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

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Maybe so, since there's no longer a need for as wide a contact area b/t backplate and case with no paper gasket.

Ben

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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