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Old 23 June 2015, 17:09   #11
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Cheers for your info,,,,

Looking like 10x12 or 10x13. 3 blade.
hi, I've got a 10.5 x 13" quicksilver black diamond prop listed for sale in "list your spare props........", only been used once but was under propped with a 50hp on a SR4, I'm after 75 ono
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Old 24 June 2015, 08:26   #12
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Cheers, but have found a new stainless steel 10x13 for 99 on ebay.
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Old 24 June 2015, 14:40   #13
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Please report back on what difference it made on your WOT RPM and overall speed.
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Old 15 July 2015, 18:12   #14
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Just got back from a wild camp in Scotland, Loch Linnhe, fitted the Johnson with a stainless steel 10 1/8 x 13 Ballistic prop. New off ebay for 79 plus tenner postage,,,,,
Very similar weight as before, revs are up at wot to 5100 just short of the starting range and the top speed has gone up from 23mph to 26mph.
Back up to Loch Lomond end of the month so will do a retest on my own and min weight.Click image for larger version

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Old 16 July 2015, 07:55   #15
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You could try lifting the engine slightly to get more revs, those ballistic props have pretty good bite
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Old 16 July 2015, 08:18   #16
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You could try lifting the engine slightly to get more revs, those ballistic props have pretty good bite
Hi all

I have a Ballistic prop on mine,my engine was over reving.Spoke to steel developments and was told going up or down a pitch would change the revs by 250-300 rpm either way,extra cupping would give 500 rpm higher but difficult to take off if needed charge was 63 plus 10 postage each way.As Roflhat says though try raising the engine first see where your revs are.
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Old 31 August 2015, 17:24   #17
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Got my dates wrong on the Loch Lomond trip, got back last week.(been very busy)
Some good days out on the Loch and all the island out there, bit of mixed weather but good stuff.

Any way after a day out with the family and back to Milarochy bay camp site, the fuel was down to test levels. Under 10L, so the Mrs and daughter went back to the caravan and I went to play. Off loaded as much stuff as I could, so with the basic stuff, left to try some speed trails.

Using remote set ups, so steering from the front, find this so much better for giving it some stick. Any way,,,,, max out at 28mph with the 10 1/8x13 prop and was pushing 5300/5400 .

May well have got a bit more had I gone for a 10 1/8x12 prop but that was not available for the price I got the 13 pitch prop for. Any way its a good alround prop, well pleased for the price.
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Old 30 March 2016, 07:22   #18
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hi, I've got a 10.5 x 13" quicksilver black diamond prop listed for sale in "list your spare props........", only been used once but was under propped with a 50hp on a SR4, I'm after 75 ono
Hi - Im looking for a new prop.. mine spun the hub after my first 30 seconds on water with my new (old) rib..

Im looking at either a 13 or 15".. mine is a 60hp 1987 - current prop is a bog standard 14" 3 blader..

Going to get a merc spitfire 4 blade, not sure if i shd choose 13 or 15.. what pitch did u choose and howd it turn out?

tx
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Old 30 March 2016, 18:07   #19
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Hi - Im looking for a new prop.. mine spun the hub after my first 30 seconds on water with my new (old) rib..

Im looking at either a 13 or 15".. mine is a 60hp 1987 - current prop is a bog standard 14" 3 blader..

Going to get a merc spitfire 4 blade, not sure if i shd choose 13 or 15.. what pitch did u choose and howd it turn out?

tx
hi, I ended up with a 11" dia. x 15" pitch ally prop, runs fine max 5900 revs and approx 34knts which I'm happy with, i would think a 15" should be good with a 60hp
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Old 31 March 2016, 00:16   #20
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hi, I ended up with a 11" dia. x 15" pitch ally prop, runs fine max 5900 revs and approx 34knts which I'm happy with, i would think a 15" should be good with a 60hp
What motor were you running? The gearing also plays a big role.. Mines a Merc mariner, at 1.64 bit under geared compared to Yamaha etc.. That's why they recommend the 13.. Using the prop slip calculator the 13 gave better results over all..

http://www.mercuryracing.com/prop-slip-calculator/

Also my wot rpm per manual is 5300.. Punch the numbers and the 13 tops the 15..


Hope it works out!

Sent from my SM-G900M using Tapatalk
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