89 AE-21 speed problems

[Dan H]

Hi guys. I have a 89 Canadain Edition AE-21 with a 1985 Yamaha 225. A land and sea hydrolic lift plate. The prop is a 27 pitch. I can't get the boat to lift. I am only getting 65 mph out of it. Any help.:nonod:

[king gill]

I actually dont know anything about these but they are similar to a HST....Did you just get this boat???What 27 pitch prop you got,ya need a prop that lifts the Bow....Do you have anymore setback or just the jackplate,I have 16 inches total setback on mine...You sure the Motor is A OK??

[lowlifeAE21]

My first boat was a AE21 and i had the same problems as you in the beginning. I found the best prop is a 26p big ear chopper with a 15" set back. My best speed was 81 with a worn 200 merc and cle gearcase. Also check your floor and transom as they get soaked really easy on the boat.
Here is a post from when i bought my AE21 and asked the same questions. Hope it helps Good luck:thumbsup:
http://forums.screamandfly.com/forums/showthread.php?t=89847&highlight=ae21

[Dan H]

I got the boat last year. I havent had the time or money to play with it yet. Just looking for a good place to start. Thanks

[David]

You'd best check the transom for rot before putting the motor back a time zone. Of course check the floor and core as well.

Lots of set back and a lifting prop. RE4, big ear chopper, maybe even a Tempest or Trophy.

[pyro]

1. :iagree: What he said
2. Get any and all extra weight out of the bow.
3. Add setback

You should be seeing 75+ once it gete loose...

[Dave_r]

Check you centre sponson. One of the differences on the AE 21 was the centre sponson is above the outside sponsons by ~ an inch. Where the HST was about 1/2 an inch below.

Due the the boats weight relative to its running surface combined with the centre sponson being above the outside sponsons; the bottom design has more drag.

I know a marina in Ontario who has modified the centre sponson of a few AE21s to match the HST and gained similar performance (But not the same). It's a pretty easy mod if your able to do some glass work and lots of sanding.

It will help with lower hosepower also as the engine is fighting to get the hull loose, thus the need for huge setback.

Once you've rulled out transom & bottom flex this will be by far your best investment.

MOTOboat,
PM me if you'd like more info.

[bigboy]

Check you centre sponson. One of the differences on the AE 21 was the centre sponson is above the outside sponsons by ~ an inch. Where the HST was about 1/2 an inch below.

Due the the boats weight relative to its running surface combined with the centre sponson being above the outside sponsons; the bottom design has more drag.

I know a marina in Ontario who has modified the centre sponson of a few AE21s to match the HST and gained similar performance (But not the same). It's a pretty easy mod if your able to do some glass work and lots of sanding.

It will help with lower hosepower also as the engine is fighting to get the hull loose, thus the need for huge setback.

Once you've rulled out transom & bottom flex this will be by far your best investment.

MOTOboat,
PM me if you'd like more info.
Little correction: the Hst it's pad is even with the sponsons;)
It is on mine... and original gelcoat and no repairs...

[voo-doo_child]

What colour is your AE?
Post some photos for us to admire.
There used to be an AE running around six mile, had a yammy on it. it Went okay.
take a couple pictures of your lower unit in accordance to the pad. that should give some set up guys a firm foundation to make reccomendations.
Also very good idea to have all structural components, transom, floor, core moisture tested, f at all possible. core could be difficult.

good luck with the boat.

[king gill]

Lets see some pictures:D:cheers:

[HydroStreamAE202]

i know that I have 10" of setback on my AE. The hull really does not start to come out of the water until about 70 mph, then it is like someone hit the turbo button. Try to move everything you can to the back of the boat, i know the gas tank in mine is in the center all the way to the back. I have had great luck with the lightning ET props but they are expensive. The prop that i use when a lot of people are on the boat is a 27p Trophy Plus and i can see low 90s with 4 in the boat.

[stroker smoker]

did any one think of lowering the motor

[150aintenuff]

did any one think of lowering the motor

hydraulic jackplate..... these boats require ALOT of setback to really perform properly.. if he only has the land and sea plate which if my memory is correct is only 5" long at best.. even if he burried the motor it really wouldnt help in the speed department...

[bigboy]

i know that I have 10" of setback on my AE. The hull really does not start to come out of the water until about 70 mph, then it is like someone hit the turbo button. Try to move everything you can to the back of the boat, i know the gas tank in mine is in the center all the way to the back. I have had great luck with the lightning ET props but they are expensive. The prop that i use when a lot of people are on the boat is a 27p Trophy Plus and i can see low 90s with 4 in the boat.

Low 90's with a trophy plus?:eek: Seems like a nice all around prop than...
That's with a 2.5 260?

What is your best speed alone and with the speed prop?

[Dan H]

The boat is from six mile. I had a cottage there, my parents sold it. The land and sea jack plate has almost no offset. The stering rams hit the hull. There is nothing in the bow of the boat. The floors are rotten I was going to rip them out this spring. I guss I should be getting the hull checked out first?
http://forums.screamandfly.com/forums/documentsandsettings\dan\mydocuments\mypictures\boat165406

165407

165408

165409

165410

[Dan H]

165411

165412

[Dan H]

the only thinh I can get off the prop is 27165413

165414

[king gill]

[QUOTE]The land and sea jack plate has almost no offset. The stering rams hit the hull. There is nothing in the bow of the boat. The floors are rotten I was going to rip them out this spring. I guss I should be getting the hull checked out first?

:eek::eek:If you are serious about all this stuff I wouldnt worry about gettin more speed:eek:If ya got some rotten floor you might have some serious issues...Like I said in my first post I dont know alot about this Hull but none of the above sounds too good...Cool lookin rig though:thumbsup:

[bigboy]

Well this is what i would do:

- new floor
- check everything else (wed foam, ...)
- add 8 or 10" setback bracket
- that prop looks like it is a very small diameter? Dont know what prop it is so cant say much about it. You can always use a good chopper, srx, mazco re4, hoss triton etc from what i've been reading
- you need less trim... the rooster tail is giving away that you are trimming to high and that you need more setback....

[David]

Drag the boat to Brechin (Hydrostream Canada) and see what it needs. If the bottom is weak and flexing, you are never going to go fast.

If your prop is a 27 SRX, it won't have enough lift. You should sell it to me.

[HydroStreamAE202]

like bigboy said more set back is needed I can send a pic of my setup i have 2 plates bolted together, you want to be able to run the motor as close to neutral trim as possible the more positive trim more power is lost "lifting up" rather than forcing forward. I know when i run wide open with my 3 blade ET there is very minimal rooster tail, i posted a video of it on you tube not great quality but you can see almost no rooster tail at 96

http://www.youtube.com/watch?v=Hfe63cSBI5c

[HydroStreamAE202]

Low 90's with a trophy plus?:eek: Seems like a nice all around prop than...
That's with a 2.5 260?

What is your best speed alone and with the speed prop?


Yes i have a 260, i have not had the chance to try out many props the trophy is a good prop with people on board, however when it is just me I cannot even see 90. the prop takes the entire hull out of the water and it gets very flighty. That why I was thinking it might be a better prop for a heavier AE. so far my best is GPS 96 with a 26 ET, i bought 2 30p cleavers to try out as soon as the lake thaws out, i would also love to try a 28 or 30 ET, i think a srx is what king gil is running so i might try to try one of those also

[Dan H]

Thanks for all the advise guys. really appreciate it.