Thinking about making good TRS lower gears and shaft.. Any interest.
05-22-2015, 09:11 AM
#11
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If you do them right, there is no shortage of customers. I have to replace upper and lowers on starboard this year. Replaced entire port drive last year. Boat has 300+ hrs, can't be mad but life would be better if I knew the new parts were better quality and durability.
05-22-2015, 10:18 AM
#12
Sounds like you are on your way to becoming a rich man....lol Seriously though, deflection does play a part in some cases but the most significant factors I see (and I'm not a drive expert but I am an engineer) are the physical gear size AND material composition / forging process. The breakage seems to be somewhat dependent on several factors such as hp, tq weight of boat, # of prop blades, and drive heights to name a few. The upper gear sets are more expensive and since now the lower gear ratio determines the overall drive ratio, I would probably start off making the standard XR upper 15/19 gears if it was me. Their are some guys on here that have done a lot of testing and some gear analysis maybe they will chime in.
05-22-2015, 10:31 AM
#13
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Sounds like you are on your way to becoming a rich man....lol Seriously though, deflection does play a part in some cases but the most significant factors I see (and I'm not a drive expert but I am an engineer) are the physical gear size AND material composition / forging process. The breakage seems to be somewhat dependent on several factors such as hp, tq weight of boat, # of prop blades, and drive heights to name a few. The upper gear sets are more expensive and since now the lower gear ratio determines the overall drive ratio, I would probably start off making the standard XR upper 15/19 gears if it was me. Their are some guys on here that have done a lot of testing and some gear analysis maybe they will chime in.
05-22-2015, 04:41 PM
#16
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If you build a TRS lower, make it a sportmaster shorty style. I'm sure a lot of people would stick with the TRS if they could buy a stout lower and gain some performance with the shorter drive. I know I pry would have!
05-22-2015, 07:27 PM
#18
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PArt of the gear problem, I believe is this:
In the gearing industry, gears are lubricated and cooled by various methods. At low to moderate speeds and loads, gears may be partly submerged in the lubricant which provides lubrication and cooling by splash lubrication. With splash lubrication, power loss increases considerably with speed. This is partially because of churning losses. It is shown that gear scoring and surface pitting can occur when the gear teeth are not adequately lubricated and cooled.
05-22-2015, 09:13 PM
#19
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Wait, that would hopefully be -2". lol
Last edited by Rookie; 05-22-2015 at 09:16 PM.
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