23' CC prop selection, Enertias?, Peter B please

ripndip · #1 11-12-2008, 01:04 PM

Peter B, that's a pretty boat you have. What props are you turning? I see you have a bracket whereas I only have 6" setback jackplates, but I wasn't ready to cut up the boat and close the transom and don't like the look of an open transom with a bracket. I am currently spinning 21P Lasers, but have tried SWS 19P, Rapture 21P, Old Mirage 21P, Mirage Plus 21P, and Mirage Plus 19P. The SWS, and both Mirage Plus' props made the boat want to porpoise with any trim out and slam into any head sea/boat wake. The Old Mirage (12+years ago) actually gave the best fuel economy and ride, but they were borrowed props and I haven't been able to find an unworked set since. I am about to pull the trigger on a set of 21P Enertias but would love any input from anyone in the know before if possible. Thanks, Skyler

peterb · #2 11-12-2008, 01:50 PM

RipNDip,

Currently, I have both 21" & 19" pitch SWS props. The 19" props give a slightly better ride.

However, I am on the lookout for a pair of 19" 4 blades (Powertechs or Revolution 4's). Everyone that I have spoken to swears that I will get much better stern lift, as well as better handling. I believe them.

Peter

PS My previous SeaCraft had 17" SWS props (twin 150 Yamaha SWS engines mounted directly onto the tansom). That boat handled great.

ripndip · #3 11-12-2008, 03:28 PM

Peter,

Thanks for the input. I wanted to try some 4 blades myself, but have heard that there is a speed compromise. It is not all about speed for me, but I do like the speed I have now, particularly the cruise, although the top end is nice too. I don't think I could swing a 21P in a four blade, but what I have learned is you never know how a prop will do until you actually try it on your boat. I didn't lose any RPM from the SWS 19's that came with the boat to the Michigan 21's. Probably because of the difference in diameter and cup. Using the prop slip calculator on go-fast.com I had like zero slip with the SWS 19's compared to normal slip with all the smaller diameter 21P props. Thanks again, and if there is anyone with any experience with the Enertias I would love to hear from them. Skyler

paragod · #4 11-12-2008, 07:21 PM

Mine is a single 250 what dia and pitch do u think on it ? Thank You

gofastsandman · #5 11-12-2008, 08:43 PM

Hey Rip,
Bushwacker borrowed my mirage + 17p and did a comparo. His 4 blade Apollo beat me everywhere I expected. He also beat me in top end by close to 2 mph. Fr Frank can you explain that? I`m still trying to figure that out.....
GFS

ripndip · #6 11-13-2008, 08:01 AM

gofast, thanks, it goes to show you never know until you bolt it on and run it. I just feel like the enertias have a better chance of giving me what I want. I would definitely try a set of four blades if I got the chance. I have found a guy on THT running a business called Prop Gods. He seems to be very knowledgeable. I just sent him a message last night and will follow up with him. thanks again. Skyler

Fr. Frank · #7 11-13-2008, 07:48 PM

Prop Gods staff have a good rep. They'll be able to help you.

And no, Sandy, I can't explain the extra 2 mph.

ripndip · #8 11-14-2008, 10:37 AM

Thanks Fr. Frank. Ironically enough I was searching on THT and have already spoken with Ken at Propgods. He is very knowledgeable, and after speaking at length with him, I decided to try spinning my props inboard again and adjust the jackplates a little higher before pulling the trigger on set 7 of props. I have been fortunate in that I have borrowed all but three of those sets of props. I didn't realize how much weight I've added, or the changes I've made along the way and I think that's why I've noticed a developing difference in ride. Skyler

peterb · #9 11-23-2008, 07:07 PM

Well, I just picked up a pair of lightly used 19" pitch Rev 4's.Paid less than 50 cents on the dollar (as opposed to buying new). We will see. Now I just got to get the right hub kits.

Peter

ripndip · #10 11-26-2008, 09:16 AM

Hello again,
Well, two weekends ago, with a friend I filled the boat with fuel, water, and oil and went out and recorded a baseline at 500 rpm intervals taking speed, fuel consumption, angle of trim, maximum plane angle, time to plane, maximum speed, maximum rpm, and what trim angle was too much. I then pulled the boat out of the water, swapped the lower units, adjusted the steering from towed out 1/4" to towed in 1/4" to compensate for the reversed rotation, re-launched and went back out. For my application there was almost no negative result from doing this. The boat was faster, and burned the same or less fuel at each rpm. Also, the small rooster tail (approx. 4') that the boat would throw at wide open/trimmed out for speed was gone. The rpms come up faster, and the boat definitely does not want to porpoise like it did before. I feel a little silly, because I had previously run the props spun in for at least a year, and switched them back at one point due to the one negative I had previously experienced- in heavy seas (6-8') the props would blow out easier. I think I have also solved that problem now- this weekend I removed the 12x12 Bennett tabs and replaced them with 12x16 heavy duty Lencos with indicator switch. I ran the boat in 4-6' seas this weekend and it has never performed so well. I will go to the trim tab post to talk more about this.
Skyler