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Prop upgrade

Old 01-27-2004, 12:21 AM
  #1  
chmath159
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Default Prop upgrade

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Does any one know if the Octura x435 will fit directly onto a Nitro Hammer or will there be any conversions required ?


Thanks for your help.......
Old 01-27-2004, 12:57 AM
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pro27
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Default RE: Prop upgrade

It'll fit as close as it can.
The x435 is bored 1/8", 35mm dia and 49mm pitch.
The stock Hammer prop is bored 3mm (a hair under 1/8), 32mm dia and 55mm pitch.

The 435 will fit with a very smal amount of slop.

One thing I have done in this situation was to wrap a little plumbers teflon tape on the shaft and then put the prop on just so it is snug before putting on the prop nut. It helps to center the prop.
Old 01-27-2004, 01:16 AM
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chmath159
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Default RE: Prop upgrade

What kind of performance differance will this produce vs using the stock prop?
Old 01-27-2004, 01:20 AM
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bill heacock
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Default RE: Prop upgrade

Never mount the prop drive dog snug to the strutt. You have to allow for the stretching and shrinking of the cable. on a 3.5 about 1/8 from the strutt, 7.5 about 3/16, 67 about 1/4 in. Run an S bend in your stuffing box this will unload the preassure on your front bearing, and most definately S bend if you are running teflon, this will stop the teflon from spinning in the stuffing box which will overheat the teflon causing it to melt and there goes the cable, which will cause a lot of damage to your boat hull. If you got slop in the cable in the strutt, replace the strutt bearing, you should have no slop in there, if you are developing slop in the cable inside your strutt, you need to make sure youre' props are perfectly balanced.

Bill Heacock
Old 01-27-2004, 01:55 AM
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pro27
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Default RE: Prop upgrade

I beleive the Nitro Hammer uses a solid shaft.

If you are running with the top hatch attached, and have not yet done so, make about a 1" diameter hole in the top hatch over the carb to allow a better airflow of fresh air to the carb. This itself helps a great deal.

The stock plastic prop will flex and loose some pitch, as it is plastic.
The 435, in metal, will not flex and the pitch will remain true.

The stock prop is smaller in dia, but with larger pitch, some of which you will lose due to the prop flexing.
The 435 has a little larger dia, with a pitch that won't change.
The 435 should be an improvement.

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