Anthony, i'll bite, coffee, and a keyboard.... We can hope, and it'll happen that Ron, and David, will arrive, as they are the pinnacle to date i've seen.... and per the 80 mph post earlier, they both have to be near the mark, or easily close in heat racing trim.
I built a few, which, all have varying results, for the satisfaction of helping some of my friends, and the concept of new blood to the 21 hydro design ideas...... a christmas gift from a great friend, and mentor........
My boat: Kit build, bulkheads pinned, tub reinforced, inclusive bait box self induced. heavier, sure.. 4 lbs whatever.... and hanging tough......
Motor: Kevin Bulifant Oval Serpent Novarossi....
Pipe: Cooper/Woods @ 7 7/8ths to the weld.....
Props and ongoing testing: Mark Sholund custom, profiled H6, 3.21, 44.93.... best yet... 50X69 @ 3.46, 45.6... consideration....
Byron fuels:... range from 55/11, to 45/16.... performance gains nominal but there.....
H ware, currently inverted speedmaster long nose 21 strut, ON the ski, speedmaster mini hydro rudder.....
Fin: currently Mike Hughes design, and ongoing testing......
Recommending per results, as I chase mine a little, of which, most times, I enjoy the tweaking/resulting data to changes more than running the thing:
The booms, are fragile enough to warrant reinforcement.... currently, 3/16ths hardware store dowel lightly epoxied and pinned inside.... solid, and yet to tell to come....... 'lectric guys are using them?.....
I've run the circle on the fins available.... currently, and this weeks new result, with the Ron Zaker applied fin brace aka: tyndall like.... had the boat instantly holding awesome in the turn, and more raillike and less hunting to dart than ever before... ie: driveability, big time, and what I'm used to..... david's fin will be reinstalled per the brace, shortly, as it's a nice piece, and designed well, for testing data ongoing.....
The rudder: must be well below the ski, and installed low on the transom.... 1 3/4 below, and 2 is better per results.... the walk issue the faster i get is something i'm working to solve, as, admitting error, mine is too high......
Kit, and Mamaril strut, seem the ticket.... mine was walking on the transom, and personally i like the 4 bolt speedmaster, and the brackets holding power.... nomimal, and beside the point, but... the Mamaril was easily filed a flat to allow lower overall strut depth, on the ski, and shimmed on the transom..... maybe, and search........ basically and a must with the strut, any strut, IMO, following the angle of the ski to infinity, per straightedge......
Fuel system struggles in heat race testing easily solved with in line hopper, as, just listening to this hull design actually RIP the turns, has enough G force to burp the best tank on mine surely.... Barney upcoming possibly........ little control line Perfect tank option.
H7, to reduced 10's, if, you have the grunt..... soon......
John Knight, and his build has made farther gains, along with Adam, here, as we all share finds weekly..... basically having serious upper end equipment, and powerplant... (John), to middle with mine, and serious bone stock kit with Adam, ( kit everything, and yet to not show great signs in gaining easily)..... Box 5 port/CooperWoods same, H5 profiled, Sholund...... this week blew his mind...... gimme that boat...... set it, and forget it, you dog....... we bumped 60's this weekend......
Everybodies different.... the boat is there, easily..... I enjoy the search... even the instructions state burn lots of nitro, and i am. Mid to low 60's and workin on it..... good luck..... mike