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Transom Height of 1972 13' Whaler
unbelizeable	#1  Posted on 12/31/08 - 2:04 AM
Member Personal Page Posts: 15 Comments: 0 Joined: 12/04/08	hi, for your boat you need a short shaft engine. yours is a long shaft.
moose	#2  Posted on 12/31/08 - 6:36 AM
Member Personal Page Posts: 543 Comments: 1 Joined: 03/07/07	Todd, I can't see very well from the pics. What color is the interior on your boat? Do you have a small splashwell in the back or a bulkhead all the way across about a foot fore of the transom? I'd say measure your transom from the top of the cutout to the bottom. The older hulls with the cut transoms are 15". If that is what you have then a short shaft is in order. Mike
kamie	#3  Posted on 12/31/08 - 7:35 AM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Todd, The transom of your 13 isn't built up far enough. To take a 20 inch shaft it needs to be flush all the way across the stern. My guess is you actually need an 18/19 inch shaft. Can you build it up the last couple inches If you don't want to do that now, then leave the 20 inch deaper in the water. It will be slower to plane but it should still work.
todd12	#4  Posted on 12/31/08 - 12:36 PM
Member Personal Page Posts: 220 Comments: 0 Joined: 07/27/06	The transom measures 20.75" . Somewhere in the boats history someone had the transom coverted to approximately 20". What I am curious about is on a newer 13' footers ( 197? - 198? ), from the top of the transom to the bottom of the hull , what is the measurement ? If it is 23-24" , then indeed whoever ,did not raise the transom high enough. The measurment was taken following the angle of the transom. [img]http://www.whalercentral.com/images/ppimages/2153/100_2609%20(600%20x%20451).jpg[/img] Thanks, Todd Edited by Joe Kriz on 01/01/09 - 10:54 AM
Joe Kriz	#5  Posted on 12/31/08 - 1:26 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11434 Comments: 452 Joined: 03/18/05	Todd, From the looks of it you don't have any extra holes in the engine bracket so you can raise the engine. What size of engine is this? Edited by Joe Kriz on 12/31/08 - 1:29 PM
todd12	#6  Posted on 12/31/08 - 2:42 PM
Member Personal Page Posts: 220 Comments: 0 Joined: 07/27/06	Joe, Its a 30hp Tohatsu. I bought with the belief that it is a 20" shaft. In two of the pictures I measured from the prop shaft to the base of the power head. It measured about 29", I checked this agaist a 90hp Johnson on my montauk.They are close to the same. I have added more pictures of the interior ( before and after ) Todd Edited by todd12 on 12/31/08 - 2:57 PM
kamie	#7  Posted on 12/31/08 - 4:32 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Todd, You need to measure the outboard from the mounting bracket to the bottom of the cavitation plate. Check out the site below. Measuring Outboard Shaft length
todd12	#8  Posted on 12/31/08 - 5:19 PM
Member Personal Page Posts: 220 Comments: 0 Joined: 07/27/06	kamie, I am measuring 22.25". On my 90hp Johnson it is closer to 20" . I was looking at some newer 13 footers, it looks like the transom peaks at the centerline of the hull. Hopefully someone will chime in with that measurement. Todd
Jeff	#9  Posted on 12/31/08 - 5:28 PM
Member Posts: 1987 Comments: 34 Joined: 04/02/05	Todd, Give me 5 minutes to put my boots and coat on and I will get the measurement for you. Edited by Jeff on 12/31/08 - 5:46 PM
Jeff	#10  Posted on 12/31/08 - 5:45 PM
Member Posts: 1987 Comments: 34 Joined: 04/02/05	The measurement from the top of the transom on my 1975 13 to the bottom of the keel is 21.5" Here is a link where you can find detailed images of the transom. The 1975 has the transom design for the 20" shaft motors. Jeff attached the following image: [64.18Kb]
todd12	#11  Posted on 12/31/08 - 6:09 PM
Member Personal Page Posts: 220 Comments: 0 Joined: 07/27/06	Jeff, Thanks, that is what I was looking for. Did you notice if the cavitation plate on your engine was level with the hull bottom or higher than the hull bottom. Maybe next time you're outside take a look. Have a Happy New Year !! Thanks, Todd
kamie	#12  Posted on 12/31/08 - 6:31 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Todd, I would run the boat. Based on Jeff's measurement your in the ball park. If you find the boat too slow to plane, you might try a dole fin to see if that helps.
todd12	#13  Posted on 12/31/08 - 6:42 PM
Member Personal Page Posts: 220 Comments: 0 Joined: 07/27/06	Kamie, I agree , no sense in spending money when the results maybe negligible. The boat is far from perfect. Its been fun and quite educational. I am getting close. At least I can take a boat ride !!! The motor will be converted to remote steering. Have a Happy and safe new year. Todd Edited by todd12 on 12/31/08 - 7:13 PM
kamie	#14  Posted on 12/31/08 - 6:57 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	Wish I was as close with mine as you are. Have a happy New Year
Tom W Clark	#15  Posted on 01/01/09 - 9:51 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	I would like to clarify, for others reading this thread, a few points already made above. Transom height is just that, the height if the top edge of the transom above the keel at the transom. It is NOT the measurement of the length along the transom. Because the transom of the classic 13 foot Whaler slopes backwards quite a bit, 20 degrees or so [Aside: Jeff -- Could you verify this for us with a protractor? ], the difference between the length of the transom and the height is quite significant. Look at the hull in profile and think of a right triangle. The transom height is the altitude of the triangle and the length along the transom is the hypotenuse. A right triangle with 20 degree angle and an altitude of 20 inches will have a hypotenuse of about 21-1/2", which is just what Jeff has reported. Kamie is almost correct when she notes the transom top of the newer 13 footers with a 20" transom is flush. It is actually crowned a bit to follow the curve of the transom. In other words, if you filled the notch on the transom of an old hull level from one side of the notch to the other, it would still not be as high as the newer hulls. The photos clearly show that the original notch was not even filled in all the way. This is why the transom is too short to accommodate the long shaft Tohatsu. Also note that "shaft length" is not just a measurement from the mounting brackets to the cavitation plate, but rather the transom height a given motor is designed to accommodate. Different manufacturers' motors will measure out differently and even within a given manufacturer's line, different models will measure differently. For example, small outboards with a nominal 20 inch "long shaft" will typically measure 22-1/2" to the cavitation plate. Larger outboards, especially Mercury brand outboards, may measure less, some as little as 19" for the "long shaft". My advice for Todd would be to install a simple and inexpensive T&H Marine Mini-Jacker which will allow the motor to gain up to three inches of mounting height without fooling with the transom any more. Edited by Tom W Clark on 01/01/09 - 9:54 AM
jsb91010	#16  Posted on 01/01/09 - 7:11 PM
Member Posts: 128 Comments: 0 Joined: 05/01/08	You could always try a bracket like I have for mine since it's a '61 low transom, it's just an aluminum "box" open at bottom to slide over transom..also i put a pic of how the engine sits...the cavitation plate is a basically right at the keel, just barely http://i136.photobucket.com/albums/q1...CN0172.jpg http://i136.photobucket.com/albums/q1...CN0173.jpg http://i136.photobucket.com/albums/q1...CN0171.jpg Edited by jsb91010 on 01/01/09 - 7:12 PM
Binkie	#17  Posted on 01/03/09 - 5:53 PM
Member Personal Page Posts: 2012 Comments: 0 Joined: 12/19/05	If your somewhat handy, you can build an adjustable setback bracket for about $40 and a weekends work. This one I built has a 5" adjustable range and a 6" setback. Its aluminum and mahogany. I have it mounted on my `61 hull and the motor is an `08 25, short shaft Merc. Although the motor will work on the short shaft hull, I found improved performance with the setback and the about 2" lift above the original transom height. If you want to build one i have construction pics. http://i27.photobucket.com/albums/c19...ished3.jpg http://i27.photobucket.com/albums/c19...rmerc5.jpg Tom gave you the correct info. Someone raised your transom, but not to the height needed for a 20" motor. I would try a short shaft, 15" motor on it. You might be pleasantly surprised, as modern outboards with modern props can really benefit from a raised position. I think your transom is raised about 2 to 2 1/2 inches. Rich rich Rich
CES	#18  Posted on 01/13/09 - 5:01 AM
Member Personal Page Photo Albums Project Albums Posts: 2681 Comments: 7 Joined: 04/27/07	Cool. That should fix your problems. Let us know how she works when you put her in the water. Also, post a picture of the motor mounted on your new transom extention too.... Cliff 1966 13' Sport with a 1993 40hp Yamaha 2 Smoker