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  15', 70hp, alum vs stnless your experiences?

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Author Topic:   15', 70hp, alum vs stnless your experiences?
SuburbanBoy posted 02-10-2001 12:37 PM ET (US)   Profile for SuburbanBoy   Send Email to SuburbanBoy  
I have a 15' Striper with a 250# 70hp 2-cycle outboard. I will be purchasing two or three propellers for this rig. I would like one for water skiing, one for general recreation (tubing etc.), and one for fishing.
Is the stainless advantage worth the added weight and price?
What are your recommendations for skiing, what size and what rpm are you turning?
What are your recommendations for general recreation (tubing etc.)?
How about fishing?
What about the "cartridge" type replacement props, anyone have any experience?
Also, how about the new generation of plastic props?
russellbailey posted 02-12-2001 11:39 AM ET (US)     Profile for russellbailey  Send Email to russellbailey     
Our's is a 1980 Striper 15. We've had two engines on it. A 1980 Evinrude 70 and and 1988. The 1988 is a bigger engine (more displacement) with more actual power - maybe this was when they changed to rating power at the prop.

We've used three different props.

13x19 - SST (stainless)- original prop on 1980 motor
13x17 - aluminum - original prop on 1988 motor
13x15 - aluminum

With the old motor, the 13x19 was too big for skiing. The 13x15 was best, but would rev out early (you could not hit max throttle and stay less than 6000 rpm).

With the new motor, the 13x17 worked well. I think the 13x19 SST actually works best - it seems to get a better bite pulling me up on one ski.

All are OMC props. If I had to pick one new prop, I'd probably get a 13x17 stainless. The stainless really seems to bite the water better under heavy load.

russellbailey posted 02-12-2001 11:47 AM ET (US)     Profile for russellbailey  Send Email to russellbailey     
I forgot to add RPM data.

With the 13x17, we turn just under 6000 rpm with light load, flat water. With the old 13x15 we tended to over-rev it (I was in my early teens then) which probably led to the 1980 motor throwing a rod.

We broke the tachometer about a year ago on Lake Lanier (GA) running at speed down the main lake through lots of big boat wakes. The boat will take a pounding, but the electronics did not. We did not replace it since we knew we were in an ok RPM range. As such, I'm not sure how fast the 13x19 turns now.

Anybody have a comment on if tachometers can take a hard pounding?

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