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Old 18 July 2012, 16:15   #11
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Maybe, although when the boat is loaded I can get the prop to spin when trying to power up, for instance powering out of the trough and over the backs of waves is one particular time I can remember. I think the hole shot and poor top end is down to the prop, hopefully time will tell.
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Old 18 July 2012, 16:30   #12
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I changed from Viper to Apollo props, much better grip and about 200 cheaper as well.
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Old 18 July 2012, 16:51   #13
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Guys

Sorry to ask a stupit question but could you explain what hole shot means, good or bad. heard this expression a few times and haven't a clue what it means

Cheers

Buzzin
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Old 18 July 2012, 17:01   #14
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Quote:
Originally Posted by buzzin hornet View Post
Guys

Sorry to ask a stupit question but could you explain what hole shot means, good or bad. heard this expression a few times and haven't a clue what it means

Cheers

Buzzin
from wiki:

Quote:
This term can also be used to describe the starting performance of a vehicle. A vehicle that is fast off the line (though not necessarily fast overall) is said to have a good "holeshot"
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Old 18 July 2012, 17:24   #15
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I have a Rev 4 19" and my understanding is that it is a stern lifting prop allowing you to plane at lower speeds. I struggle to get the bow up even trimmed right out but can plane at 10 knots. They work really well on heavier boats. Generally you can run them high, they have fantastic grip, rarely blow out and great hole shot. Not the best for top speed but good for cruise and better than most for manoeuvring.

However all boats are different and what works on my boat might be rubbish on yours. What ever you get make sure you get it balanced even if new. I tried a new 21" (higher top speed but WOT too low) and it felt like a blade was missing at 2300rpm.

Check out the hull truth forvlots of views.

Have fun
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Old 18 July 2012, 17:47   #16
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Originally Posted by buzzin hornet View Post
Guys

Sorry to ask a stupit question but could you explain what hole shot means, good or bad. heard this expression a few times and haven't a clue what it means

Cheers

Buzzin
Hole shot a measure of boat/engine performance much like the 0-60 time quoted for cars.

It refers to the time it takes for the boat to get on the plane from dead stop at maximum throttle
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Old 09 August 2012, 08:40   #17
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Cheers Guys

You dont ask, you dont get.
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Old 04 June 2013, 09:07   #18
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I could not resist the weather today, so I have been out prop testing. The conditions were just right; a slight chop to 'unstick' the hull, but nothing to cause me to back off.
The boat was originally provided with the engine set at this lowest setting. I was running a 19" Viper at one hole up from the lowest engine height. This is where the Viper seemed happiest and Mike Vincent has told me that the Vipers like to run 'high'. At this setting I saw 5900 max revs. On the basis that I had to start somewhere I bought a 21" Apollo of the same diameter. The first thing that I noticed is that there is a greater surface area to the blades of the Apollo.
I ran it at the same height and it ventilated some, particularly in the turns, but I could only pull 5300 max revs. I have now dropped the engine by one hole and the boat feels a lot better. No ventilating in the turns and I can really feel the boat accelerate, as opposed to just spinning up the Viper as it did before . The numbers are still 5300 max revs, best one way speed 48.2 knots, with 43.5 knots on the return leg. This is a good 2 to 3 knots up on what I was seeing with the Viper. The tanks were almost full, 200+ litres, and one pax on board.
Before I go out and spend another 400+ on a 19" Apollo, does anyone think I should be looking at something different?
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Old 04 June 2013, 09:51   #19
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According to Evenrude you reach your max 200hp at 5350 RPM which is in the centre of the recommended Full Throttle RPM Range 4850-5850 tr/min
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Old 04 June 2013, 12:19   #20
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Quote:
Originally Posted by Ian M View Post
I could not resist the weather today, so I have been out prop testing. The conditions were just right; a slight chop to 'unstick' the hull, but nothing to cause me to back off.
The boat was originally provided with the engine set at this lowest setting. I was running a 19" Viper at one hole up from the lowest engine height. This is where the Viper seemed happiest and Mike Vincent has told me that the Vipers like to run 'high'. At this setting I saw 5900 max revs. On the basis that I had to start somewhere I bought a 21" Apollo of the same diameter. The first thing that I noticed is that there is a greater surface area to the blades of the Apollo.
I ran it at the same height and it ventilated some, particularly in the turns, but I could only pull 5300 max revs. I have now dropped the engine by one hole and the boat feels a lot better. No ventilating in the turns and I can really feel the boat accelerate, as opposed to just spinning up the Viper as it did before . The numbers are still 5300 max revs, best one way speed 48.2 knots, with 43.5 knots on the return leg. This is a good 2 to 3 knots up on what I was seeing with the Viper. The tanks were almost full, 200+ litres, and one pax on board.
Before I go out and spend another 400+ on a 19" Apollo, does anyone think I should be looking at something different?
At 5300 RPMs the engine is "lugging" you should be looking to get 5600 RPMs minimum and no more than 5850 when normally loaded. (2 up, full tank of fuel)

You should have the ventilation plate on the e-tec set 2" above the bottom of the transom and fit the Viper 2 19" prop you should be good for 48 knots with the 200HP and this set up.

This is a proven set up on this boat / engine combination. I am surprised you had issues with the Viper as you stated it has always produced the best results on previous 6.5 meter ribs.

Drop me a PM with your phone number and I will have a chat with Mike Vincent tomorrow to see if he has a 19" Viper 2 you can test.
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