Boat Lift overall Bunk Height

[TexP51 6]

Newbie here - 

‘02 Elite V C4 - wondering about bunk height for proper shaft clearance for those of you that have boat lifts.  I’m planning on  switching our boat house bunks from pontoon configuration over to a V-drive setup for our Centurion.  Plan is to place (2) 2x12x14 treated boards screwed together and mounted on end, resting on the lift’s cross-cradle as a bunk.  I’m putting a 10 degree cut on the top of the 2x12’s to provide some angle, and cover that 3” edge profile w/ synthetic gator bunk cover.  Wow, four of those treated 2x12x14’s weigh close to 300#!  I’ve seen Mastercraft boat lift setup similar w/ 2x10’s.  Are my 2x12’s overkill?

[InfinitySurf 302]

Do you have a trailer for your C4 that you can measure the clearance you need? I helped a friend replace his lift bunks for his 2014 SV233, I think they where 2x12, but cant remember exactly since it was 2 summers ago. I do know we used his trailer as a guide on how high it needed to be, as well as the distance between the bunks.

[TexP51 6]

Well I got the new bunks on my lift converting from pontoon to v-drive.  I’m picking up a used 2002 Elite V C4 Air Warrior this weekend and driving it to Texas from Florida.  I had to get this project moving.  Screwed two 2x12x14s together and using table saw cut a 15 degree angle to top edge.  Boards sit upright on the boat lift cradle, and are spaced at 5’ apart at back cradle, and 4’ 10” at front cradle.  Cradles are 12’ apart.  Bunks sit at 8” over front cradle and 14” off back cradle.  I also added stanchion bumpers that aren’t in the pics on both cradles to guide the boat.  BH-USA was very helpful and had everything I needed.  I did have to use longer 5” SS bolts for the bracket/bunk mount since the bunks are som much thicker.  Many people only do one 2x12, but I wanted to be sure.  Biggest challenge was the bunk timber is very heavy when it’s doubled up, so working with it takes serious muscle.  I still waiting on the glide/covers that I ordered that will sit on the face of the bunk and keep the boat from sitting on wood. 

[WakeDoc 471]

Built a new boat house for our 2010 SV240 awhile back. Used a set of aluminum v-cradles and bunks from Lunmar Boat Lifts HERE. Our trailer has a main set of bunks, plus a small set on the inside at the bow and a set outside at the stern. Went with a center to center measurement of the main bunks for the spacing of the bunks. Since the main bunks kept the same width spacing the length of the trailer, did the same on the cradle. Not sure on the width but, will measure. Below are a few angles of the assembled cradle.

The v-cradles are about 10 feet apart, if your boats sits on the cradle like ours you should have nothing to worry about.

The following pic is the best angle I have of the boat shaft compared to the bunks and cradle. Twelve feet apart might be a little to far apart, be sure not to lift it up sitting on the shaft the first time or two.

[DrPringle 10]

How does the polly system work ?

[WakeDoc 471]

I have not had any issues with it, we drive/float the boat in place and lift the boat out of the water. Have not noticed any issues.

[TexP51 6]

Finished our boat lift.  Went this weekend to FLA and hauled a new-to-me 2002 Elite V C4 Air Warrior back to TX and got to see how it fit on the system.  Spaced the bunks at 40” and they worked perfect.  

[WakeDoc 471]

Good job!

[TexP51 6]

Wake of - Appreciate your taking the time to explain your setup.  Thx

[WakeDoc 471]

what lake you on?

[TexP51 6]

Lake Limestone - 13,800 acre lake between DFW & Houston near Groesbeck, TX

[WakeDoc 471]

Spent so time on it myself