Question involving a transom notch
 

Just wondering if anyone out there has added a notch to the transom of a non notched gun or café racer with good results? I have found that only 3 or so cafe's came with the notch and is there a reason for that? It seems like it wouldn't be that big of a deal to add one especially if one was say like redoing the transom or stringers or whatever....I see claims of 3-5 mph gained with the notch so am just wondering if anyone has added one??

Thanks

Will do thanks!! How did it work out for you?? I'm sure it's probably all outlined in that thread but for sake of sparking thoughts on this one??

Rick, what props are you running now? Also, where is prop shaft measured to bottom of hull?

I spaced down 2" last year, going to go to 1" this year. I noticed that it simply could not get above a certain RPM with such big diameter props.

I gotcha...makes sense..would boxes do essentially the same thing and not give you the hop?? The boats in question really are an 87 gun with konrads no notch obviously and a 90 café with bravos and no notch...not that I would do it if I ended up with one of these just curious really more than anything...trying to spark some conversation on the subject

thanks guys!!

Is the Konrad TG the one you looked at back in November? If so, I had seen on FB over the weekend that its getting parted out due to wet transom and stringers.

Yup same one...I saw it said sale pending but was thinking of calling on it again and see what the story is....guess that settles that lol...still looking at a café as well

Might still be a decent purchase on that gun...if the price is right of course....and depending on how far forward on the stringers is wet

If your not interested , Is there a contact # for the soggy TG......friend is looking for a pair of Konrads if its being parted out........I'm not on FB

Just called as I wanted to buy and fix it and was told by Ed at big thunder that hes already got a buyer for the drives and motors and is parting it out....too late I suppose...I woulda paid 30 for it even being a little wet...fiberglass and wood is cheap

bummer

who’s Ed?

Ed Champion at Big Thunder Marine, Cliff owns the boat and Ed was the broker.

Ed Champion is @ big Thunder Marine

I talked to the owner of the boat, all sold but the engines...said someone had been jerking him around for a while about purchasing it, and decided to part it out

I don't think the "rot" is that bad...sounds like its one stringer and a section of transom under the exhaust...I need to try and get ahold of him before he starts ripping it apart

Apparently the only thing left is the engines according to the owner...oh well

so back to the purpose of this thread...would this have been a good candidate to add a notch in the transom being it had to be replaced anyway?? Just wondering

Hi Frick , I am running 17.5 dia 25 pitch four blades I have seen 75 mph top speed at 4600 rpm in 1 to 2 footers with 3 on board and a half load of fuel. I agree i think the dia is big for my application . The motors are built to run at least 5200 rom . Measuring from the bottom ahead of the notch I am at 2.75 inch below the running surface . I set it up so that i could get close to level with the bottom if i take the 3 inches of spacers out . Currrently it planes quite quickly with 6 people and a full load of fuel . I am not concerned so much with top end but I think if i raise the drive an inch and start to reduce dia I can see 5 to 7 mph without sacraficing plane time . I dont want to have spin the drives more than 2500 to 3000 rpm to get her up on plane . Right now it carries the bow nicely and i dont want to lose alot of leverage by going to high . I wil report back once I start to make the changes .
RG.

Rick - sounds like you're on the right track. I felt my boat was slower when I spaced "down" 2" and running 18" dia. props (Which is roughly 2" below the surface, on boxes and notched), top end came down, and wouldn't spin much over 5100. I ran it the first season even / no spacers and had challenges getting on plane. I think my sweet spot is 1" below, and I would like to try smaller dia. to see if the RPMs get up over 6K.

as of last night he still had it complete, Tim J been trying to buy for his buddy to get the Konrads they could not agree on price, then I tossed idea but didn't have time to make a trip, he told me 5-6 people wanted it and never showed..

I don't think at 7-80 mph it's worth the work

Full force , my motivation was two fold , one I wanted to upgrade from my number 3 drives to the stronger Number 5 drives and not spend the $ 15 k i would have needed to put the boxes on and secondly I was looking for improved speed and handling . It is faster , the drives are beafy and the notch improved the mid range handling characteristics and top speed . The upside is it only cost me the materials and the equivalent of about 70 thousand dollars of my time ( LOL ) small price to pay . Never said I was the sharpist pencil in the box . I must admit I think it was worth it for me as I enjoy that kind of punishment . RG.

not a café or tg but cigarette added a notch in my bullet in the 90s. from what I was told it helped that boat. once you figure it out and dial it in it doesn't hop at all. 3800 and 60mph smooth as can be.