Texasmark
Supreme Mariner
- Joined
- Dec 20, 2005
- Messages
- 14,785
More of being home bound. :'(
Been surfing this site: (On the www site is: old-omc.de) for a long time and yesterday I discovered a new attraction. There is now a copy of a 1954 71/2 HP Owner's Manual for your enjoyment.
You really need to take the time to read through this whole manual; it's really interesting. It gives you insight into the innovative things OMC engineers had on their minds way back then (early days of modern outboards) and it gives you an idea as to how dedicated they were to making their outboards quiet.....well I guess so after the unrestricted exhaust of the early years. If you ever ran an OB with the exhaust dumped into the air vs the water you know what I mean.
And while you're there check out the rest of the neat things he has for you in the sales brochures. I can walk through them and see my life in front of me.
I like to pay particular attention to the differences in engine ratings/parameters then and now; boats then and now, girls then and now 8) (hey I'm human) and in the case of OMC, their low value of WOT rpm's.
Maybe the low rpm high cu in design was deliberate to help their noise abatement philosophy. My current engine is an '02 (Merc) and is pretty quiet but as you move into 5000 RPM and above the noise goes up significantly. So it makes sense that if you can get the whoopie at low RPM's it's going to be quieter; besides big cubes and low rpm's spell torque and torque is what these babies had.
The other thing I noticed is how complacent folks were then when running around just above planing speed....I mean I learned to water ski behind an 18 hp Rude.....little tough getting up but once up it was ok....ok, not stellar and it was 2 skis, no slaloms, and I weighed 90# soaking wet.
Course back then when 25 or 35 hp was tops, you didn't know any better.....we didn't......and then there was Mercury.
Thought you might like this.
Mark
Been surfing this site: (On the www site is: old-omc.de) for a long time and yesterday I discovered a new attraction. There is now a copy of a 1954 71/2 HP Owner's Manual for your enjoyment.
You really need to take the time to read through this whole manual; it's really interesting. It gives you insight into the innovative things OMC engineers had on their minds way back then (early days of modern outboards) and it gives you an idea as to how dedicated they were to making their outboards quiet.....well I guess so after the unrestricted exhaust of the early years. If you ever ran an OB with the exhaust dumped into the air vs the water you know what I mean.
And while you're there check out the rest of the neat things he has for you in the sales brochures. I can walk through them and see my life in front of me.
I like to pay particular attention to the differences in engine ratings/parameters then and now; boats then and now, girls then and now 8) (hey I'm human) and in the case of OMC, their low value of WOT rpm's.
Maybe the low rpm high cu in design was deliberate to help their noise abatement philosophy. My current engine is an '02 (Merc) and is pretty quiet but as you move into 5000 RPM and above the noise goes up significantly. So it makes sense that if you can get the whoopie at low RPM's it's going to be quieter; besides big cubes and low rpm's spell torque and torque is what these babies had.
The other thing I noticed is how complacent folks were then when running around just above planing speed....I mean I learned to water ski behind an 18 hp Rude.....little tough getting up but once up it was ok....ok, not stellar and it was 2 skis, no slaloms, and I weighed 90# soaking wet.
Course back then when 25 or 35 hp was tops, you didn't know any better.....we didn't......and then there was Mercury.
Thought you might like this.
Mark
