---

As I do quite a bit of shallow water (3-8ft.) high-speed trolling (+/- 5mph) and had the habit of sometimes hitting rocks, I thought it might be a good adea to carry a spare prop and need your advice.

Current setup:
1991 Outrage 17
2005 E-Tec 90hp on a 4" aluminum setback manual bracket (AV plate is 2,25 in. above the lowest point of the keel)
Prop is an OMC SS Viper 13 7/8 x 17 (part #763930)

Alone (220lbs) with a full tank of gas (34 gallons), it rev a bit too high at WOT (5600rpm, 39mph), the optimum range being 5000-5200rpm, but it handle really well without never losing grip. Hole shot is phenomenal, it cruise nicely and stay on plane at 20mph but there's a tendancy to porpoise at WOT when fully trimmed up, wich I hope to take care of by moving the batteries into the console. With 2 or 3 people aboard and loaded, the WOT rpm is right around 5200-5300.

As I need a second prop, am I better to buy a similar one (that one http://www.boats.net/parts/detail/pro...63930.html seems priced right) or should I look for something else with a higher pitch to bring down my rpm? BRP doesn't make the Viper in even pitch number but it seems that a 18 would be perfect in that case...

Any recommendations?

Thanks.