Hi Adam, Though not an AB and this package that they tested may be a bit heavier than what your AB comes in at, the performance tests will be very similar. http://www.yamaha-motor.com/assets/products/otb/bulletins/bulletin_4stroke_mi dthrustjetport_al_nov-335dl-f25tlrc.pdf also http://www.yamaha-motor.com/assets/products/otb/bulletins/bulletin_otb_4Strok ePerf_MidThrustJetPort_25hp_0199-AVN-Z.pdf and lastly.. http://www.yamaha-motor.com/assets/products/otb/bulletins/bulletin_4stroke_hi ghthrust_al_zna-yl340deluxe-t25tlrd.pdf All three RIBs are different, but the results should be able to provide you with a fairly concise average that you can apply to your AB package. Many variables play into the end result and you simply cannot actually determine it (for real) without running your boat, loaded. Some have already been pointed out in responses to your original post. Not mentioned are the type of prop, the condition of your prop, the condition of your carburetors (are they clean, burning the fuel efficiently, etc), the condition of the bottom of the boat (is it clean, painted, etc). Best Regards, Stephan Lance VP, Defender Industries, Inc. 42 Great Neck Road., Waterford, CT 06385 Telephone: 860-701-3400 x.100 Website: Defender.com

On Tue, Sep 28, 2010 at 2:32 AM, Stephan Lance <slance@defender.com> wrote: > > Not mentioned are the type of prop, the condition of your prop, the > condition > of your carburetors (are they clean, burning the fuel efficiently, etc), > the > condition of the bottom of the boat (is it clean, painted, etc). > > Stephan, this is fantastic data. It does look like an estimate of 10mpg at planing speed should serve me well. I understand about the other variables. While my prop looks to be in excellent shape, I don't know its diameter or pitch. And the bottom is clean, with a black ablative bottom paint. Which leads me to a couple of related questions: - Can anyone comment on experience with adjustable- (not variable-) pitch props like the Piranha or Propulse? - What bottom paint is recommended for a RIB? The black ablative makes a huge mess and gets everywhere. If we keep the dinghy on the boat deck is there any real reason to use bottom paint? Thanks. This has been a great thread. /afb