Prop for 6.2 Raptor?

[whatshesaid]

2 hours ago, teamerickson said:

I currently have the 2277 on the boat with a 2249 as backup/spare. I'm happy with the 2277 but would like a tad more. Most of my boating is around 500 elevation. It does fine surfing but sometimes I wakeboard heavy. I'm definitely not the prop expert but taking with someone it seems as the 2849 might be very similar to the 2277 with a little lower RPMs. I think the 2847 would give more pull then the 2277 with similar RPMs. So I'm leaning towards the 2847. This is all kind of new. The general consensus was keep a minimum of 1 inch prop clearence. 

The prop you need is the one im running now #2849  15.50 x 15.50  cup 0.105

If you don't want to buy a new prop you should have the local prop shop bring the cup down to 0.105 this will let it slip more, and raise the rpm slightly... That will make your prop 15.00 x 15.75 cup 0.105

 

[whatshesaid]

16 hours ago, Lees23 said:

Compared to the 2277 the 2849 gives you a 1/2" diameter increase  and drops the pitch from 15.75" to 15.5" and the 2847 gives you the same 1/2" diameter increase and further drops the pitch to 15".  Care to explain how these 3 props will perform differently in surfing and cruising applications?

 

[whatshesaid]

Just now, whatshesaid said:

 

Im no expert, but from aggressive to less aggressive I have them listed.

 After talking with Acme about the cup,, the different in each cup can simulate about 1.00" in pitch. For example prop 2277 has more cup than the 2849 so it would simulate the pitch to increase from 15.75 to 16.75, and that is why people are not satisfied with the low end TQ for surfing with this prop. I have noticed over the years that most stock props are 0.105 cup, so I wanted to stick with that as a guide.  I hope this makes sense.

#2847   15.50 x 15.00  cup 0.075

#2849   15.50 x 15.00  cup 0.105

#2277   15.00 x 15.75  cup 0.150

 

[teamerickson]

4 hours ago, whatshesaid said:

Im no expert, but from aggressive to less aggressive I have them listed.

 After talking with Acme about the cup,, the different in each cup can simulate about 1.00" in pitch. For example prop 2277 has more cup than the 2849 so it would simulate the pitch to increase from 15.75 to 16.75, and that is why people are not satisfied with the low end TQ for surfing with this prop. I have noticed over the years that most stock props are 0.105 cup, so I wanted to stick with that as a guide.  I hope this makes sense.

#2847   15.50 x 15.00  cup 0.075

#2849   15.50 x 15.00  cup 0.105

#2277   15.00 x 15.75  cup 0.150

 

The 2849 is 15.5 x 15.5. 

[teamerickson]

I just ordered a 2847! 

I'll get back with results in a few weeks. 

[ConnollyCrew]

10 minutes ago, teamerickson said:

I just ordered a 2847! 

I'll get back with results in a few weeks. 

Waiting impatiently....?

[Sailvi767]

I am curious if you measured your prop clearance before ordering the 15.5. On my boat the 15" is already less then a inch. OJ props stated you will burn the hull over time with less then a inch. A 15.5 would put me at ⅝ inch clearance. I am going to double check and remeasure as I would like more diameter but dont want hull damage.

[Fman]

39 minutes ago, Sailvi767 said:

I am curious if you measured your prop clearance before ordering the 15.5. On my boat the 15" is already less then a inch. OJ props stated you will burn the hull over time with less then a inch. A 15.5 would put me at ⅝ inch clearance. I am going to double check and remeasure as I would like more diameter but dont want hull damage.

 I don't think I have enough clearance on my '17 either without risking prop burn.  I'm going to remeasure again.  So your saying minimum clearance is 1"?

[teamerickson]

57 minutes ago, Sailvi767 said:

I am curious if you measured your prop clearance before ordering the 15.5. On my boat the 15" is already less then a inch. OJ props stated you will burn the hull over time with less then a inch. A 15.5 would put me at ⅝ inch clearance. I am going to double check and remeasure as I would like more diameter but dont want hull damage.

I've got a good inch maybe more. I need to measure again. I talked to ACME. He was ok with 3/4 clearance with the 410 raptor. The bigger engines are a different story  

 

[Lees23]

27 minutes ago, teamerickson said:

I've got a good inch maybe more. I need to measure again. I talked to ACME. He was ok with 3/4 clearance with the 410 raptor. The bigger engines are a different story  

 

Color me dumb but why does a bigger motor make it okay to have the prop closer to the gel?

[whatshesaid]

For the record, im running 3/4 clearance, and have been out twice with out any hull damage on my 2016 lsv.

teamrickson, just curious what Acme said to you about the 2847 (15.50 x 15.00 cup .075)? What do they expect it do do for you? 

On paper it looks to be very close to the beast mode prop 2249 (15.00 x 14.25 cup 0.105)

My guess is it will give you less that 1 mph gain over the beats 2249, but my i'm interested in learning more. The change in cup seems very tricky. I was told by acme, that with less cup is about -1.00" pitch. So comparing it to the beast 2249 with less pitch. In my head it would make the #2847 new pitch to be (15.50 x 14.00). I think will preform very close to the beast 2249.

 

[teamerickson]

2 hours ago, Lees23 said:

Color me dumb but why does a bigger motor make it okay to have the prop closer to the gel?

The opposite. ACME felt the bigger engines need at least 1 inch.

Edited May 9, 2017 by teamerickson
Some incorrect information

[teamerickson]

50 minutes ago, whatshesaid said:

For the record, im running 3/4 clearance, and have been out twice with out any hull damage on my 2016 lsv.

teamrickson, just curious what Acme said to you about the 2847 (15.50 x 15.00 cup .075)? What do they expect it do do for you? 

On paper it looks to be very close to the beast mode prop 2249 (15.00 x 14.25 cup 0.105)

My guess is it will give you less that 1 mph gain over the beats 2249, but my i'm interested in learning more. The change in cup seems very tricky. I was told by acme, that with less cup is about -1.00" pitch. So comparing it to the beast 2249 with less pitch. In my head it would make the #2847 new pitch to be (15.50 x 14.00). I think will preform very close to the beast 2249.

 

I believe we talked to the same guy at ACME. Tim, Jim? In my talks, We didn't think the 2849 would give me enough reason to change. I was looking for something in between the 2277 and 2249. I think the 2847 will give me more with similar RPMs as the 2277. Not as much as the 2249 though. Won't know for sure until I try it.

[shawndoggy]

1 hour ago, teamerickson said:

The opposite. ACME felt the bigger engines need at least 1 inch. Higher spin rate. 

The SC motor has a taller transmission which is going to mean that the prop spins less (with same prop, any given speed is going to have lower rpms on the SC motor).  

Maybe they meant that with the extra power it's easier to get the prop to cavitate?

[teamerickson]

6 minutes ago, shawndoggy said:

The SC motor has a taller transmission which is going to mean that the prop spins less (with same prop, any given speed is going to have lower rpms on the SC motor).  

Maybe they meant that with the extra power it's easier to get the prop to cavitate?

Ah, could be. I can never remember all the information they throw out when I talk to them.

[Fman]

I just measured today and with a 2277 I am at 7/8" clearance.  I dunno, I hope you guys don't burn your gel because that is going to be very close with a 15.5" prop.

[teamerickson]

3 minutes ago, Fman said:

I just measured today and with a 2277 I am at 7/8" clearance.  I dunno, I hope you guys don't burn your gel because that is going to be very close with a 15.5" prop.

Hmmm? I need to remeasure. That would put you at 5/8 with a 15.5. I don't think I'd do that.

Acme should make the shaft diameter just a tad smaller so it doesn't go on so far. 

Edited May 9, 2017 by teamerickson

[ConnollyCrew]

I am curious if anyone has tried the 2247, think I may give it a whirl.

[shawndoggy]

Just now, ConnollyCrew said:

I am curious if anyone has tried the 2247, think I may give it a whirl.

So on my axis with 1.72 and GM 6.0/450 I am running the 2249 which is the factory high altitude prop.  Performance is basically indistinguishable from a 2315 on a 1.5 transmission.  I'd guess the 2249 would act a lot like a 2313 would on a 1.5 tranny.

 

[Fman]

1 hour ago, teamerickson said:

Hmmm? I need to remeasure. That would put you at 5/8 with a 15.5. I don't think I'd do that.

Acme should make the shaft diameter just a tad smaller so it doesn't go on so far. 

You could also fasten a stainless plate under there.  Imho I'm not sure if it's worth the headache.  I think there are some good 15" prop options that would work for you.  Just my .02

[McMiller]

So if I want to run a 17" prop I can just carve some more room above the prop like my buddy's 40 foot sea ray.

 

[MadMan]

On ‎5‎/‎9‎/‎2017 at 4:51 PM, teamerickson said:

Hmmm? I need to remeasure. That would put you at 5/8 with a 15.5. I don't think I'd do that.

Acme should make the shaft diameter just a tad smaller so it doesn't go on so far. 

I have some prop burn on my rudder at the point where the prop is closest.

[teamerickson]

I put the 2847 on today just to measure clearance. I had 7/8 with the 2277. With the 2847 it's about 1/2 or 5/8. Too close. I'm returning it.