Philippines Banca 100 Islands

Update August 1

Latest Updates attached, Ribs finished working on panels, and outrigger connection points.

 

very very nice!

 

I see you have the top transverse installed in the defining frames and the "shoe" where the outriggers rest. Nice curved art for the shoe. Like a shoe, they are deisigned to wear out due to constant flexing of the outriggers.

Be careful when planking. Twist may introduce. Those plywood has a lot of kinetic energy when bent. Finish the second half as soon as possible or use temporary stiffening members.

 

Update August 6

Stern tube chiseled out, Starting to fit engine, vibra-sorb mounts and building control console.

 

Duly noted, and thanks again for your input!!

 

Epoxy Primer

First coat of Epoxy primer

 

hi

Would you know if it is possible to get a banca hull built in the Phillipines, say 33ft lenght, hardwood frame, marine plywood, epoxy throughout and fiberglass over the plywood. How much in US dollars would it cost to get a hull like that commissioned. Not sure if your the right person to ask, but thought it may be worth a go

 

Propulsion system installation

Update --- Installing propulsion system- Engine, pillow blocks, vibration absorbers, and Python drive system w/thrust bearing.

 

Sept 3 Update

First coat of Epoxy Enamel paint. 2 & 3 will be sprayed on. Engine mounted and tested. Hanger was re designed with heavier stainless plate.

 

Thank you for all the updated pictures. I've been enjoying the thread.

 

We are thinking about the Auto Throttle Gov factory installed on this engine. From what i read in the manual this is a sort of mechanical speed control common on these engines.

I have never used any type of throttle control on a boat, I can understand its use on a Bobcat or another type of tractor, however my question for RX or anyone else is -- is this advisable for this type of propulsion system? I imagine that setting the throttle at a certain speed RPM and the engine maintaining it would be good, however im not sure how it would handle down slowing down and when the boat comes off plane, the engine should want to increase RPM as the drag increased? Anyone tested this?

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From the Manual:

GOVERNOR
Engine is equipped with a centrifugal flyweight mechanical governor. It is designed to hold engine speed constant under changing load conditions. Governor gear/flyweight mechanism is mounted inside crankcase on closure plate, and is driven off gear on camshaft.

This governor design works as follows:
** Centrifugal force acting on rotating governor gear assembly causes flyweights to move outward as speed increases. Governor spring tension moves them inward as speed decreases.

** As flyweights move outward, they cause regulating pin to move outward.
** Regulating pin contacts tab on cross shaft causing shaft to rotate. One end of cross shaft protrudes through
crankcase. Rotating action of cross shaft is transmitted to throttle lever of carburetor through external linkage.
** When engine is at rest, and throttle is in FAST position, tension of governor spring holds throttle plate open. When
engine is operating, governor gear assembly is rotating. Force applied by regulating pin against cross shaft tends to close throttle plate. Governor spring tension and force applied by regulating pin balance each other during operation, to maintain engine speed.
** When load is applied and engine speed and governor gear speed decreases, governor spring tension moves governor lever to open throttle plate wider. This allows more fuel into engine, increasing engine speed. As speed reaches governed setting, governor spring tension and force applied by regulating pin will again offset each other to hold a steady engine speed.

 

That engine type is almost always equipped with that kind of centrifugal governor and I can't imagine a situation where you would ever try to run without one. We installed an 18HP Honda twin in a remote controlled catamaran, for propulsion power, and it was very well-behaved with the mechanical governor, even in very rough water conditions.

 

Well for one, you will void the warranty. Second, your prop is not yet on the optimum setting. You need the engine to perform at its best.

I have had some instances where the marine engine reps would adjust the governor (of the big engines), but not much and only with the blessings of the service rep boss. They are loading the engine but probably within limits,

On a personal experience, I tinkered with a small horsepower single piston air cooled engine and was not able to replace properly the governor. It got stuck on the high side. The engine run but it sounded like it was trying to destroy itself.

 

Looks like well be keeping the GOV intact. Kohler replied back to us finally they said they only heard of people removing the GOV for AIRBOAT, do to the way the prop was rotating and the pitch of the blades would limit the RPM.

Thanks!!

 

Update Nov

Launched, without engine and gear will install on the beach. We are now attaching the outriggers couple more days until sea trials. More pics soon after engine and propulsion re-installation.