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HomeAircraftHelicopterThunder TigerOther › Rappy 90 & OS 61 WC??
05-05-2005 07:49 PM  13 years agoPost 1
MPDano

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I am thinking of getting a Rappy 90, but I have an OS 61 WC that is barely broken in. Can I bolt this up and use it until it dies, then go to an OS 91 later? Anyone tried this setup?

Thanks

Leo Dano

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05-05-2005 09:25 PM  13 years agoPost 2
CACTUSJACK (RIP)

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Yes, it would be okay as long as you change the gearing to 10T pinion and 93T main gear. 680-690 blades would be the limit.

.

X5X7 Animum Vestrum Negotium Agatis

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05-05-2005 09:40 PM  13 years agoPost 3
MPDano

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Thanks Cactus Jack, what is the normal 90 gearing? Also, why would I be limited to the 680-690 blades? Is this due to power?

Leo Dano

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05-05-2005 11:11 PM  13 years agoPost 4
CACTUSJACK (RIP)

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I'm using 8.27:1(91T main, 11T pinion) on my 90 w/OS91 and MP2, w/710 TT blades, 1850 head speed. One of my flying buddies has a YS91 and uses 8.45:1 (93T, 11T)(stock gearing on the Raptor) with the Hatori SB-16.

I think a 60 would be hard pressed to turn bigger blades.

.

X5X7 Animum Vestrum Negotium Agatis

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05-18-2005 11:48 PM  13 years agoPost 5
MPDano

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So a 93T and 10T pinion would be 9.3 gearing. This is good for a Raptor 90 with an OS 61 w/MP2 with 680mm blades?

Leo Dano

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05-19-2005 12:13 AM  13 years agoPost 6
MJA

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UK

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The older MP1 (that was developed for the OS61SX) might work better(give more power) than the MPII 90 size pipe
,although i've never tried the 90 sized MP on an OS61.Just assuming it will ,because the tuned engine range will be off.OS91 revs lower than the OS61SX when it makes it's most power


Martin

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05-21-2005 06:31 AM  13 years agoPost 7
MPDano

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Well, I already bought a pinion and gear, so I guess I will give it a go and see what happens. I can't do 3d yet anyways. I should have it all together next week.

Leo Dano

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05-24-2005 04:03 AM  13 years agoPost 8
MPDano

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Okay guys, I changed to 93 and 10 gearing. The mesh sounds terrible. Is there some kind of adjustment?

Leo Dano

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05-24-2005 04:34 AM  13 years agoPost 9
MPDano

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My bad, sorry. Chapter 6-1 in the manual. I was used to my R50 being set.

Leo Dano

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07-02-2005 01:38 AM  13 years agoPost 10
MPDano

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My Rappy 90 with an OS61 WC and MP2 with 93T and 10T pinion works great. Thanks for the help guys. I just threw on a GV1 and can't wait to try it out tomorrow.

Leo Dano

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