The propshaft on the #3 is 1.750 but tapers down to 1.375 . the 3A is quite a bit stronger than a 3. With that being said, I know of many guys who have ran quite a bit of power thru #3s with good luck.

Problem with the kaama drive, is the twin disc trans can't handle much . not sure if anyone can build one for 1000+ ft lbs of torque. The kaama drive will take the same 19 spline props as a #3.

The #3, also has twin vertical shaft design with each shaft and gear splitting the load to the propshaft, like a #6 does. Konrad does not have that option, and has a smaller propshaft than a #3.

If I remember correctly(been a long time for one) kaama had a bearing or 2 that needs to be upgraded to take alot of hp/tq.have the notes at the shop.

Sutphen Man
 

Jeff Long time no see Did you take your boat out before the cold hit to burn all the gas out? Got that donzi 21 from maryland and stripped the drivetrain out Sold the hull and trailer to someone in jersey who had just sold his 27 mag The new owner wanted more cubes so he took the motor out and Im getting all the guts from it Fit my block perfect 5 hrs on it Will be 548 cubic inch tall deck The block and pan is down there now 625 hp when its done The big question is run the trs or retro fit the number three off the donzi to my boat It also came with hydraulic steering setup for the three The tabs were bigger on the 21 than the 27 Going to run it the way it is now for this year Will collect parts and do it next winter Give me a shout

Konrads are just a newer and sightly better alternative to a TRS... not in any way to be mistaken for a suitable replacement for a Speedy... I've put 850's in front of #3s on a 38 Fountain Lightening and the customer ran for many years with them... just saying

#4s and #5s are both surfacing drives... either one is great and depending on HP levels, will deliver same results

The only downfall ...if you want to call it that is the learning curve to speedys if your used to a bravo or trs boat the speedys won't win any hole shot races. They take lots of RPM like any surface driven prop to get on plane. Cleaver style props destroy the water because tip speed is literally boiling the water your trying to push . It feels like they are blowing out but once you get on the top its like you hit the NOS button. Most pleasure boaters don't like it and it can be a little tricky to manage very ruff water since the speedys can only keep the boat planed at higher speed. My boat wouldn't stay up under 28 mph ....granted dead rise and other things play a factor. I had to learn a few times in very ruff conditions 8 to 9 footers on Lake erie is a bit ruff even in a 38 you stick the next swell since they are 45 feet apart. Just my experience with the 5s on my boat.

i have never seen a bravo boat with 14 inches of empty space in front of the crank pulley before you get to the rear cockpit bulkhead. no trans makes for more space in the boat for bikinis. and cheaper to build...

depends on the setup, and props. My current 17x28 props, slip coming on plane. Takes a little while and about 4000RPM to lay over. I had a different set of 17x27 props a few years back. Props didnt slip a bit, and I could accelerate from idle to on plane like a ski boat. Some buddy's boats with 3's, plane off like a trs/bravo boat, even with 3 blade cleavers.

You must have never been around anything other than 21ft runabouts.

These are bravo equipped boats.

What in the actual fuk are you trying to say? Hulls are built the same bravo or TRS.... Name one boat that is built different because of it, name one....??