Have any Twin Rig Owners tried higher prop pitches? I have a 20' footer powered by Twin Evinrude 175's. One engine is not counter rotation. Since I don't pull the large numbers that Show Teams do, I have always used 19 pitch stainless props without a problem. I had a great hole shot and the engines red lined with about 10% of the throttle left. I decided to experiment a little bit and bought a pair of stainless 21's on Ebay. It didn't seem like I lost anything out of the hole, and had more top end. But, it still red lined prior to WOT. While running just one engine at WOT trimmed up, I was throwing a rooster tail just like the Bass Boats, but not while running both. Something interesting did happen while running both engines at WOT trimmed up. The boat began to dog track to the left. It has never done that before with the 19's. Perhaps the reason was the higher speed and lift. It seemed like the boat was moving to the left on the transom probably because both props were turning to the right. I didn't consider the situation dangerous, and it straightened out as soon as I backed off the throttles. I'm sure that condition would be eliminated with counter rotation, but I haven't been able to justify the substantial cost. Overall, I was very satisfied with the 21's and I am considering using them full time. I would also be interested in test driving with a set of 23's or higher. Does anyone else have any experience higher pitch props on Twin Rigs?
I've never gone about 19's on any twin rig I'ved driven or owned. Props are too expensive to just try stuff for our ski team. We always run 15's or 17's on twins, and I prefer the 16 pitch (0389925 BRP Part number) for single V6 apps as it should give upper 40's for speed and tons of low end while having good speed holding. I actually am going to be trying several props on a single engine boat maybe this weekend. For the base I have the 16 pitch and I will be trying the new Rebel from BRP in 15 pitch and 17 pitch to see how that compares. I suspect with the bigger blades the 15 pitch may be as fast as the 16 and the 17 probably will be 50mph plus, but I could be wrong. 4 blades seem to only work real well on the big block V6's as they tend to load the engines more. I have just not found much to beat the standard SS 15, 16 or 17" pitch that does not have much cup. Unfortunately now most 17's are cupped so you have to stick with a 15 or 16. The dog tracking is due to the non counter rotation but also with hydraulic steering these boats tend to pull left a bit more as well without counter rotation. This action is accentuated because of the basically flat bottom and no strakes on a dyne. Yes there is a fin, but it is far enough forward that two motors with right hand rotation can make the back end slide left. In high trim situations dynes can be some of the scariest boats out there too if you pull off the throttle hard. Set up is important as the little collar on the hydraulic steering can come loose and allow for some play in the system which accentuates these conditions.
i was wondering what prop pitch would be best for my 20' dyne twin 82 115 mercs there is 17pitch props on there now ----------------------------------- Also,i need to replace a stator on one engine should i do this myself, Mad (i feel confident to do it) Rock On or should a mechanic do it Question thanks for your time! North Dakota Dyne
Are you happy with the way it performs with the current props? Do you have enough top end speed for what you want to do? Do you have enough grunt to pull whatever you want to pull out of the water? Most show teams with twins (150 and up) use either 15 or 17 pitch. Must-ski motors has more experience with smaller twins and can tell you what he has used on the 90 twin last year, or the 115 twin for this year.
I would do the stator myself. It is a bit trick to get the flywheel off but after that its easy. Try http://outboardparts.com for your motor they list the stator at $166.00 I run 19 pitch props on my Dyne 18 w/115s. Gives me plenty of pull and about 53mph on the top end. Daniel
I would not go to 19's with your 20 footer. 17's will be best all around, especially if you ski alot. You should be able to get upper 40's to close to 50. One thing with twins is alot of people do not mount the engines high enough. I start at least one hole up on the traditional mounting brackets and 2 up is not a bad idea to reduce drag and make your trim more effective.
