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Jon and V Boat Conversions & Modifications
Anyone running a Alumacraft 1436 with a Tohatsu 6HP? Top speed?
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<blockquote data-quote="fwman1" data-source="post: 490322" data-attributes="member: 31515"><p>It turns out that my Tach was set to max RPM of 6000. I changed the upper limit and found actual max rpm was 6200 rpm. Since the recommended rpm range for my engine is 5500-6000 rpm, I continued my search for a best prop for my application.</p><p></p><p>Drag is likely my biggest issue. I'm considering that since my boat does not come out of the water between uses, the bottom needs a good cleaning.</p><p></p><p>I purchased a Solas 7.8 x 8" prop and took it out for a spin. The Solas rep I spoke with expected around a 200 rpm drop. That was a low estimate. I lost about 400-450 rpm. On the new prop, rpms are 5760. Top speed is between 14.3-14.5 mph. The engine sounds happy enough. It doesn't seem bogged down, although it is no longer singing at those 6200+ rpms. My Tohatsu manual states 5500-6000 rpm in the specs. My engine has only about 17 hours now. Hopefully I'll gain a bit more as the engine completes its break in.</p><p></p><p>I will continue with the 7.8 x 8" Solas prop. I'll save the Solas 7.8 x 7" for trips with another angler. With another person, the 7" pitch would likely be about right.</p><p></p><p>For those who come behind me.</p><p>2021 Tohatsu 5hp</p><p>1436 Alumacraft flat bottom Jon Boat. All up weight about 500 lbs.</p><p>Stock Tohatsu 7.8 x 8" prop: 5300 rpm WOT and 11.75-12.15 mph</p><p></p><p>After 6 HP aftermarket carburetor swap</p><p>Stock Tohatsu 7.8 x 8" prop: 5380-5400 rpm and 12.25-12.5 mph</p><p>Solas 7.8 x 7" prop : 6200 rpm and 13.8-13.9 mph</p><p>Solas 7.8 x 8" prop : 5760 rpm and 14.3-14.5 mph</p></blockquote><p></p>
[QUOTE="fwman1, post: 490322, member: 31515"] It turns out that my Tach was set to max RPM of 6000. I changed the upper limit and found actual max rpm was 6200 rpm. Since the recommended rpm range for my engine is 5500-6000 rpm, I continued my search for a best prop for my application. Drag is likely my biggest issue. I'm considering that since my boat does not come out of the water between uses, the bottom needs a good cleaning. I purchased a Solas 7.8 x 8" prop and took it out for a spin. The Solas rep I spoke with expected around a 200 rpm drop. That was a low estimate. I lost about 400-450 rpm. On the new prop, rpms are 5760. Top speed is between 14.3-14.5 mph. The engine sounds happy enough. It doesn't seem bogged down, although it is no longer singing at those 6200+ rpms. My Tohatsu manual states 5500-6000 rpm in the specs. My engine has only about 17 hours now. Hopefully I'll gain a bit more as the engine completes its break in. I will continue with the 7.8 x 8" Solas prop. I'll save the Solas 7.8 x 7" for trips with another angler. With another person, the 7" pitch would likely be about right. For those who come behind me. 2021 Tohatsu 5hp 1436 Alumacraft flat bottom Jon Boat. All up weight about 500 lbs. Stock Tohatsu 7.8 x 8" prop: 5300 rpm WOT and 11.75-12.15 mph After 6 HP aftermarket carburetor swap Stock Tohatsu 7.8 x 8" prop: 5380-5400 rpm and 12.25-12.5 mph Solas 7.8 x 7" prop : 6200 rpm and 13.8-13.9 mph Solas 7.8 x 8" prop : 5760 rpm and 14.3-14.5 mph [/QUOTE]
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Jon and V Boat Conversions & Modifications
Anyone running a Alumacraft 1436 with a Tohatsu 6HP? Top speed?
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