Power vrs Rigidity
Just a boating experience that wanted to share with Ribnet inflatable lovers...
Scenario : Lima’s South American Spear Fishing Game Contest
Field location : 12 Km ride from mainland
Water conditions : flat crystal no wind, slight foggy morning
Outiside temp : 20ºC, water temp 16ºC
Participants : 15 Zodiac F470 sibs, 01 Sear Rider 420 rib
Main Engines :
Yam 2 Strokes 30, 40, Etec 30, 40 HP, 90 Octane Unleaded E8
Tohatsu 2 strokes 18 HP, 97 Octane Unleaded E8
Engine & crew distribution :
F470 : 30 HP crew of 3 & fishing gear
F470 : 40 HP crew of 4 & fishing gear
SR420 : 18 HP single driver, empty deck & cold beer cooler.
All participants had dived for 2 previos days the contest field to spot the best place and fish, so the dilema was who got there first and secure & dived the best spot as you could not have any other fishing competitor closer to 60 meters. Who won ? Zodiac 470 with Etec 40 ? Wrong. Sea Rider 420, Tohatsu 18
How could that be : Having already reached the engine transom sweet height spot years ago, placed an extra ½" shim for water flow to pass in between upper and lower AC plate to have minimum tail drag as the race was a perfect straight flat course. All boaters went full wot from second one, as power HP rules, the 470-40 HP sibs lead the lead followed by 30 & 18 horses, after completion of just 1/3 course pointer boaters were already losing track and final speed along the way due to tech matters.
To my complete astonishment and fully excitement ended first followed by 50 meters difference by a 470 with Etec 40 who was riding on top my near flat perfect wake. Sorry folks, no French Champagne for the winner, jus t my plain boating satisfaction and racers total disbelief...
Tech explanation : All 470 had been inflated in the morningr and were not air topped once rsting in water after some minutes for air preesure to stabilize, so all 15 had under inflated main tubes, lower speed tubes, air floor & keel, fishing gear was badly deck distributed and above all, all 470 with engine transom water splash issues and excessive rear wake due to underinflation issues. At 1/2 race though my Tohatsu 2006 engine was going to explode or loosen cylinder head bolts while hearing sweet 5.6 K rpm’ delivering 41.5 Km/H at top 3.5 psi well inflated tubes and perfectly ballanced & trimmed rib.
Conclusions : This story confirms that it’s not a power matter, it’s lack of rigidity matter, if in pursuit of achieving best top speed and cruising perfection it’s a must have :
1-Air top inflated sib as factory recommended
2-Well deck ballanced sib
3-Engine properly trimmed
4-Correct engine height on transom