TRS prop size question

[502schiada]

I have a 79 22' schiada with a trs out drive and a 21 pitch mirage prop with velvet drive. The motor is a 550 hp 502. Boat is new to me and i was told it did 98 at Elsinore at the drags (old owner was boat racer). Ive rebuilt the motor with more hp now and have only seen 56 mph on gps at 5000 rpms. He said he used a 24 pitch prop to achieve that speed . Does this sound right to anybody? :) I would like to see that 98 mph.

[Beer-30]

I don't doubt that your Schiada has done 98 mph. It didn't do it with 550 hp, though.

[burtandnancy]

Here's your formula; rpm x pitch x ratio x .0009469 divided by slip = speed. If you don't know ratio, try 1.5 which was very common with that old drive. So you have 5000 x 24 x .67 x .0009469 = 76.1 less slip, maybe 15% average = 64.6. You can see you have some variable to fool around with, but this boat never did see anywhere close to 98 mph. Come up to at least 1200 hp, a lot more gear/pitch and OPPS, you can't do 1200 hp with a trs, at least for very long. So now you need a dry sump six drive and there goes the cost of boating.

[502schiada]

Thankyou for the info.

[full throttle]

To get the most out of your set-up, loose the mirage and go to a Bravo-1 or Hydromotive Quad-4 24P 4/blade. Like to see pics of your ride. I am a Schiada owner also.

[mondorally]

I have a 79 22' schiada with a trs out drive and a 21 pitch mirage prop with velvet drive. The motor is a 550 hp 502. Boat is new to me and i was told it did 98 at Elsinore at the drags (old owner was boat racer). Ive rebuilt the motor with more hp now and have only seen 56 mph on gps at 5000 rpms. He said he used a 24 pitch prop to achieve that speed . Does this sound right to anybody? :) I would like to see that 98 mph.
As a bit of a reference I have an '86 22' Schiada with a powerglide & a Speedmaster #4. It has a blown 468 BBC and I'm getting 75-80 mph. (non-gps) out of it with around 700hp and a 24 pitch 3 blade chopper. My tach bounces around so much I can only guess I was hitting around 5k or so.
How far up does your engine sit versus a normal bravo 1 setup? Mine is around 18" or so, pushing the weight much farther forward than normal - great for the rough stuff, bad for top speed and seating area.
Got any pics of your setup?
Justin

[502schiada]

I will try to get some pics of it up tomorrow. I was kinda looking around at new drives today and saw the konrad trs replacement drives and the arneson surface drive. Which one do you guys think is the better one , that will rob the least HP and bump up the mph? Looked at the #6, but cant afford that.. :mix:

[full throttle]

The Konrad is a good way to go for all around use. There was a 22 w/Arneson around a few years ago I was looking @. Spoke to the owner many times. He was getting 88 with an old T-turbo set-up. Probally 600HP. Arneson will give you best top end, but will sacrifice low speed control. I am personally a BIG fan of arneson.

[502schiada]

Tried to upload some pics, but the site kept saying error, i will try again tomorrow.
I found a hydomotive q4 24 pitch prop for 150 $ i might try out. It came off a bravo 1 , it should fit my trs right?

[full throttle]

Yup. That should get you into the seventies.

[burtandnancy]

502, I was pulling your chain a little on the #6 dry sump (althought they are outstanding). If you can wait until this years LA boat show there will be some exciting new drives to consider that will really bring your Schiada to life...

[502schiada]

just put on the new hydromotive q-4 24 , and tried it out today, got me 5mph more, but cant tack 5000 rpms anymore, about 4700- 4800.gotta get me that new drive :idea:
i'll try to post some new pics i got..

[full throttle]

Just grabb'in here, but what lube are you running in your TRS? The trans your using is Merc trans II, or a Borg warner. That should'nt move your engine too far forward. Also, when your drive is trimmed down, where is your propshaft in relation to the bottom of the hull?

[502schiada]

Im running quicksilver performance lube in the drive, and the propshaft center is 10" below the bottom of the boat. It is a borg warner trans , it is 32" from the transom to the center of the motor.

[full throttle]

If the propshaft is 10" below the bottom of the boat, Thats your major problem. Shoot pics.

[dirty old man]

I've never seen or heard of a prop that deep in the water (for an outdrive that is)

[502schiada]

Im trying to post pics, but it keeps saying upload error , invalid file, but they are jpg pics 81 mb. Anyone know why? :umm:

[Riverkid]

You'll need to upload the pics on the Image Center @ ***boat.com. Then bring the pic up after uploading it, right click it and grab properties. Copy the link to the pic. Come back here, get your thread going and then hit Insert Image icon (it's above the text box under the size font tool, yellow background with mtns on it). Paste your pic link and you should see the pic come up after posting. Hope this helps.

[502schiada]

Just put a new set of lightning headers on and messed with the trim tabs and outdrive trim this weekend and finally saw 70 mph!!! :)

[mondorally]

Any pics yet?
Justin

[502schiada]

Not yet I will work on it this weekend, i will have some time. I have pics but it takes a while to get em on the website for me.

[502schiada]

I have a lot of new pics but still cant get them up. If i email them to someone can you post them for me?? Thanx

[mondorally]

I have a lot of new pics but still cant get them up. If i email them to someone can you post them for me?? Thanx
Check the second post here
Picture posting help (http://***boat.com/forums/announcement.php?f=20)
Justin

[502schiada]

Just took the boat down to schiada today to find out more about this hull. He said its not one of their hulls, but has a lot of their characteristics. He seems to think its a Vaughn, a one off of schiada ,has anyone ever heard of it or know anything about them? Im still workin on posting some pics... :mad:

[full throttle]

email me those pics.

[RiverDave]

Feel free to e-mail me the pics riverdave@rivertoys.com I'll post the up for you. :)
RD

[502schiada]

Did you get the pics i sent RD?

[502schiada]

I finally got some pics up! :rollside:

[full throttle]

I like it, but damn you...now I am reminded how much I want a 22. Still think your propshaft is too deep. Get ahold of Max Machine Workz, and see what they charge to cut it down. Or you can sell it to me, and I'll fix it. You can keep the motor too.

[502schiada]

Thanks, i wont be sellin her though, i love this boat, rides like a cadillac. I talked to the guys at schiada and he was sayin the ideal depth for the outdrive is about 4 inches. Does anyone make a shorter lower unit for the trs , or does it have to be cut?

[full throttle]

I'm not sure. I'd call Max machine or The Bravo Shop. A #3 lower may fit.

[full throttle]

Have any luck finding one yet?

[502schiada]

Not yet, i havnt had time to look into it yet. Got a project fishin boat ive been workin on too. Maybe this weekend i'll call max machine. Thanks for the info on that! Weathers been nice, i gotta get it out!

[full throttle]

Funny. I'm working on a fishing rig too. Big Vee w/ twin outboards.