Are you running the standard konrad lowers or the shorties? He is spinning stock 30p bravos.

Did any of the Flatdeck 38's have notched transoms?

Mild Thunder; I am running the standard Konrads. I raised my X with the TRS drives a few years ago when I had to replace my transom board. I was 3.25 inches above the stock height initially with the 1.5 inch shorter than TRS Konrads.RMPRam is the only 38 flatdeck I know of with a notched transom. Rick

Thats fast. When I had 600hp motors and TRS drives mine went 69 or 70 tops spinning 24 or 26 bravo 1 props. Raising the X makes a big difference.

Kris

Kris; when my drives were deep I ran 27 pitch mirage 3 blades with Bobs nose cones with best speed of 76mph. 4blades were just to much prop for my small motors. When I raised my drives the 3 blades were blowing out getting on plane, switched to stock 30p 4 blade bravo 1 and picked up 4 mph, the following season labbed the props to 31s and picked up another 2mph. Before Konrads we had a best speed of 82mph. Rick

He also dumps captain morgan in the fuel tank:grinser010:

kvogt; Kris I was hopeing your horsepower nos. would be closer to mine, at the time I was looking I was told I would have a 10 to 15% all around performance increase with the arnesons, X demension being a non issue. You are smokin running 90 in a flatdeck, youre closing in on RMPRam , the fastest flatdeck I have heard of. Rick

These number seem right. My motors dynoed at 600 and these are the speeds I'm getting
Mark

Mark do you spin your props in or out? Kool-aid's turn in on his gun. Running mine in on my Formula gains some speed/bow lift. I get about 70-71 with the maximus 5 blades 26p turning in.

I believe my motors make around 600ish hp. Kris would know! Love these little motors! :drink:

Mild Thunder; very suprised to read you are running a 5 blade max on a 402 formula , what drives are you running? Rick

Mark; 69 to 70 seems about right, really? At what RPM do your motors develop 600 hp and are you running the drive spacer in your Konrads ? Rick

They Dyno at 602 HP at 5200 and 689ft of torque at 3500

I run 1 " spacers boat was slower with higher X and tougher to plane.

My props turn out 5100RPM 25 Hydomotive P5X.

I think your dyno was a bit conservative.:eek:

Fox Hunter runs a bit over 70 with Kevlar hull 540's and #3's
His 540's are estimated at 650HP.

Mark:drink:

Mark , I am perplexed, we have a friend with a stock formula 382 non step hull with sealed 500hps 25 pitch mirage 3 blades running 70. My scanner is acting up so Eric will pm my dyno sheet to you . My engine builder N.D.Engines doesnt have a dyno, Performance Engineering Racing Engines, Inc. was contracted to do the testing. I have never heard of a engine builder underating horsepower. Rick

I'll answer for Mildthunder. The boat has TRS drives with a very high X for a TRS setup. Prop shaft is around 4.5 inches below the hull. What I heard the boat was originally rigged with speedmaster 2 drives.

Kris

Kris, the 402SR1 is a notoriusly heavy wave crusher a great ride in big water not a fast hull. Those numbers make sense. Rick

Heavy, for sure. 15,300lbs on the trailer axles at the truck stop with less than 1/4 tank of fuel. Met a guy up in south haven this year who had a 402 a few years back. He thought I was full of $hit when i told him i get 70mph out of it on GPS. He had 400HP mercs and said best he could get was about 54.

Tried 3 blade mirage plus props this summer, they were USELESS! Could not get on plane in any kind of chop, and best speed was 65mph at 5000rpm spinning 27p. Slip was ridiculous.

One thing i'd like to do this winter is redo the deck/hull joint, new sealent, thru bolt, and possibly glass from the inside.

I got the dyno sheets that is what they say. It doesn't matter what the dyno says, the boat is doing the talking. It obviously runs very good.
Was there any work done to your bottom?
Do you have the HP bottoms (built in nose cones)on your Konrads ?

Mark

Mild Thunder, a few years ago I was involved in offshore racing and a number of 382 step hulls in F2 class were running the Maximus, the guys liked them but again the x was very high comparatively speaking. One of the things I learned in offshore racing is the obvious doesnt always make sense, 70 is a big number for that boat. Rick

Mark; my Konrads are the standard drive. Shortly after buying my drives I talked someone at Konrad about converting to the hp, I declined based on a convesation I had with Zero Patients a board member with a 38 top gun. He thought the hps were a little slower, he tested both. I dont recall who said it at the time but I was told the hp was beneficial primarily to 100mph plus cats. And just for the record, for those who may not want to remember, those 382s with the maximus props I mentioned earlier, SMOKED by Tres Martin and Team Virgins 36 Gladiator. Rick

Tres Martin and Team Virgins 36 glad smoked a lot of other boats.:drink:

My 85 Mistress... Marblehead, Ohio

if the mistress counts as flat deck... :)

http://i36.photobucket.com/albums/e4...3-34-51958.jpg
http://i36.photobucket.com/albums/e4...-58-03_684.jpg

beautifull boat!

not from tha great lakes but still a flat deck
 

38 se 572's #4ssm

The boat looks great how fast is she

I second that! Boxes and IV's are cool!

Was this a #3 boat that you added boxes and IV's to? If so, tell us about the performance changes.

It came from cigarette with the boxe's #3's & 540ci hawk engines.I put in the 572's and took off the 3's and put on the #4's.I have tried alot off different props can't get the slip factor down below 28%,from 4,000-5,500 I have a large amount of slip.I'm going to try another pair this weekend,Im hoping to get her to run close to 80.btw the prop shaft is 1.5" below the bottom thanks for the nice compliments.

try some 18 inch diameter 5 blades

I tried 17x26 5 blade hering's with not much luck.I'm looking for some larger diameter like you said,hopefully it will get my slip down.Its hard to find the larger diameter in the lower pitch numbers,like 26-28 pitch in a 5 blade.

Where did you get those cool cavitation plates for the #4 drives?? I dont have them, and everytime someone, including myself, steps on my swim platform, freaks me out the thought of slipping and landing on one of those cleavers. ugh

They were on the drives already when I bought them,the guy told me they help get the boat on plane by keeping the prop flooded with wate,It dosen't seem to make any difference with them on.

fixx
 

try removing the plates,,could be causing captivation by drowning the props..

There are 3 in miller marina st clair shores mi all mistresses a77 an 85 and a75 we boat on lake st clair

Great boats guys . I will post some pictures of my 85 flat deck. Kvogt I have a what might be a stupid question. In order to run the props in a counter rotation manner do you have To run one motor in reverse ?
RG.

I have a custom set of Arneson drives. The right hand drop box has gears in to allow that box to counter rotate.

I would try droppping the boxes 1 notch. This will put you alittle deeper and probably reduce your slip. As someone else suggested also try taking the cavitation plates off too.

With modern props he should be fine. Usually the pain is getting on plane without a high rpm burnout, once up on plane most guys don't have a large slip problem. Is there a hook in the bottom or something, that is keeping the hull to wet?

I don't disagree with modern props. Cost is a big factor though nless you can find someone who will let you borrow something close to what you need. The extra inch of depth may help more than hurt performance without spending the money.

Would be good to know if there is a hook in the bottom. Spinning the props in will pull the transom down some and a hook will drive the nose down. Bad combo.

38 cig
 

I ran the boat this weekend with 17 3/8x30" 4 blade props and it was like a different boat,it got up on plane with no problem and the slip came down to 15%,the best so far.My only problem is that i'm down on rpm's.I'm looking for 17.5 or 18 dia.x26 or 27's.My prop shaft is 1.75 below the bottom so it seems like the larger dia. is helping me alot with getting on plane and helping the slip%.thanks for everyone's input I appreciate it.

Good news!! Heres a thought, keep them 30's on there, and add some horsepower to get your RPM up. Might be cheaper than new props and more fun in the end!

I wish it was in the budget, but you have a good point.I just had these motors built &I don't feel like doing it all over again.I think going with a lower pitch should help me reach my rpm range and give me more speed I hope!!!

Hey Kvogt where would one get a set of those drives?
RG.