Thank you Shane and David,
Shane if you have a rigger collecting dust you should try out your Alpha .56, looking like 3.7" to 4.5" total pitch is needed to get into some speed.
The .56 alpha is a good choice if you want to opt out on water cooling. The full course of oil flow through the cam up the rod tubes to the
rockers and out the exhaust makes it a winner. Valves are efficient hence the torque is there to tap into high pitched props which is a
easy to gain with big dia. props but past 52mm is wasting the power on tap least for a 3ft / 3lb rigger. Will try the props shown in pic
left to right in that order next, hope to test both props next Sat. Need a clear conclusion what prop size makes for a good blend of
thrust and top end speed without stressing out the engine to failure. Thus far the engine is holding up with ease as expected but treading
forward with care to insure I don't ruin it along with watching the trim of the new rigger design as the speeds increase. 25" from the back
of the sponsons to center of the prop hub length gives a reasonable ride thus far.
One thing I have not mentioned is I took vid of a second run on Sat. the file did not save correctly / it will not play. The run had the rigger about
3 clicks leaner with the same prop it was moving faster about 5 mph, the winds kicked in and during a down wind turn it caught air due to rough
water cartwheeled and lucky for me landed back on it's feet. 4 stroke engines have a very narrow peak NV setting once your near the sweet spot
they make a ton of power truly singing it's song. On the straights it did just that going from a hair rich to clearing it throat and moving out with some rpm.
I was alone Sat. had to quickly air up my inflatable kayak and scramble out to fetch, the winds had it about 70yrds out when I got under way. After all
that fuss the heat sent me packing I was toast, content with the testing and thought I had the event saved on my sports cam. The black silicone tube
I use to keep the removable sponsons on had saved the right sponson on impact it shifted the sponson in on the carbon tube without cracking / splitting wood.
Normally there is a retrieval boat with a small outboard to use. I should have had the kayak blown up on tap but thought my fishing pole would be enough.
Still want a rough water rigger so had a custom coupler made for M7x1 threads for Saito .72 four stroke see pic 4.75ft long skinny rigger will later upgrade to
the OS FSa 1.55 Alpha should ride like a Cadillac. 5ft 1.5" total to the end of the rudder.
