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What would you say it would be a nice chine beam for a typical 7.5 m rib, for it to go easily in the planning?
The boat was the OCEANO ASD 9 (see my gallery) built by my ex-friend J.Barreras Larramendi in Vigo. I have spent long time in Vigo and Galicia with my friends Adrio (father and son) screw manufacturers. The evolution of engines and propulsion systems has not been accompanied by innovative hull designs giving support to the concentration of weight in the aft part of the high speed hulls. Porpoising phenomenon at all speeds due to difference between the longitudinal center of gravity and the longitudinal center of buoyancy. ASD (Arrow System Design) is a hull shape invented for the modern propulsion systems and is able to avoid problems deriving from high speed.
The ASD (Arrow System Design) hull consists of a central deep vee hull having two special shaped annexes in the aft.
The longitudinal center of buoyancy is closed to the longitudinal center of gravity well aft, allowing the boat to run parallel to water at high speed. The heeling angle of the boat is not in excess of 5°, thus allowing very secure and stable maneuvering. High stability in all sailing conditions due to the two annexes that give very high values of GM. The ASD hull is very receptive to an overload in payload with no substantial decrease in performance due to the high value of waterline surface. Location: TRIESTE (ITALY) In my Forum gallery you will find the video of the NAJA ASD during steering trials at 50 knots. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
I advised them that I wanted to go open ocean outside the Golden Gate Bridge and my first view of the design shows a deadrise of 16 degrees. My question is, how does this deadrise affect boat handling in open ocean conditions, I'm not looking for top speed but, control of the boat. Personally, I would have thought that given the narrow beam of the rigid hull, you could comfortably incorporate more deadrise to improve rough water handling. Then again, as Tri Star suggests, I wasn't up all night reconciling, calculating and burning the midnight oil! I appreciate your input and to provide a little bit more info, the inside beam is 1600mm, the radius of the tube is 235mm. Location: Australia Tri Star - I wasn't trying to be irksome, nor pointing out any mistake's on your part.


The designer no doubt took all of these things - and many others - into account in designing the boat.
Location: Chandler(Gaspesie) Quebec For a RIB, the deadrise is very important. Somes builders offer more than one deadrise moderate V for little ripple or deep-V for choppy water. Originally Posted by willfishforbeer Im wondering if the deadrise of the boat pretty much defines the angle where it will plane? Planing angle is measured fore and aft and indicates the angle of the hull in relation to the surface of the water at planing speed. 2) Planing (or trim) angle is the angle the fore and aft keel centerline makes with the still waterline at speed. 4) Deadrise angle has more to do with reducing slamming motions than with the trim angle that the hull runs at. Interesting idea and I'm sure Savitski knows what he means, but I am a bit confused that the answer is a true equivalent deadrise. I had the opportunity and the fortune to carry out a lot of tank test in model basin for such boats.
If I recalculate the results with Savistky the bare hull resistance is underestimated in all the cases. Only at the end of the evaluations I use Savitsky together with many resistance vs speed curves and I apply this correction for the spray strips. Spray strips have an effect on resistance for sure but the tested Savitsky's models have'nt such things probably because the scale effect.
Location: TRIESTE (ITALY) I have carried out some tank tests with a model equipped with and without spray strips. For this reason it would be better to calculate the spray strips effect separately and to apply a correction on the deadrise angle. Resistance with and without appendages have been carried out as well self propulsion tests. Location: TRIESTE (ITALY) Concerning your 3 boats, I have estimated the speed according to KR diagram based on built boats with OB. I dont know the seastate which are mentioned in that area but the best combination for the size boat (8 - 8.5m) going offshore is a 20 - 22 deadrise. A frind of mine (unluckily dead in a terrible accident) used that kind of hull forms more than 15 years ago, here in Vigo. I have experienced problems with one having 18,5º deadrise and 1,94 m chine beam at the stern.


The difference of the two longitudinal centers, as described above, generates a boat running with an important trim angle.
The two lateral annexes with their optimal shape, reduce drastically the heeling angle at fast turning.
I am purchasing plans to build a 27 foot rigid inflatable which will be powered by twin 150hp outboards. This will be at some expense to lower speed handling, but given that RIB's tend to be driven quite quickly regardless of conditions, I would have thought that 20+ degrees of deadrise would be a good starting point.
Designing military craft, where the contractual speed is the most important thing, use Savitsky method is dangerous for me and the shipyard.
He produced several patrol boats for the Customs, around 12-14 m long (if my memory doesn't fail me) which performed pretty well.
This is a handicap because the propulsion is working an inclined flow with loss of efficiency.
The lack of volume in this area forces the boat to extreme heeling angles with dangerous decrease in stability.
The construction is stitch and glue and the total weight of the boat will be approximately 1,950 lbs.
The narrower beam will lessen the shock loads (though with RIB's this can sometimes be offset by the fact that the tubes come into regular contact with the water, even though their flexibility reduces the impact somewhat). If the chine beam is designed in such a manner to assist the boat with early planing, its great.
If these problems are at an acceptable level for sport boat drivers, they represent an open problem for military boats.
BUT - in my opinion, given the light weight that is typically inherent in rib's, greater deadrise can be carried without major detriment to performance. A 16 deg deadrise on the boat mentioned - wear a kidney belt or fit the boat with suspension seat. If it were my boat and I was intending to charge around at 40 knots in sloppy conditions I would incorporate greater deadrise.




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