2112

Anyone here have a carbon Fiber or aluminum driveshaft made to replace the heavy merc unit in an staggered set up?

If so, do you have recommendations for who to go to?

BenPerfected

I have used Dynotech Driveshafts, Troy, MI (800 633 5559) to recondition, high speed balance and modify my Stellings driveshafts. They also make steel, aluminum and composite driveshafts. www.dynotecheng.com

2112

Thanks;

Anyone know how much parasitic loss can be attributed to the forward motor in a staggered application?

Has anyone corrected this in the prop pitch?

phragle

compared to parasitic losses in the drive, Im not an engineer, but given a relatively true alignment, and running on good pillow blocks/bearings the loss wouldnt really be significant to the application. Now if it were say a drag boat, maybe, as the weight would only an enertial detriment to acceleration. in an offshore boat that extra spinning mass might theoretically help to absorb the shock of the prop comming out of the water before it reaches the coupler/engine.

JCPERF

Like Phragle said,It should only effect acceleration

2112

Well, It does take more fuel to keep it matched to the non shaft engine when accelerating and when the day is done, overall fuel consumption is about 4-5% more as well.

These two engines were within 2hp at nearly all points on the RPM scale on the dyno so I am trying to deduce why the need for extra fuel.

I am also not running CNC'd props yet. Each set I have used do the same thing but to a lesser degree with the bigger pitched props.