home built tilt and trim

[T-Rex21]

Hi guys new to this site and have what to you guys is probably a dumb idea, but here goes. I own a 16ft j-series skiff with a late 80's model 40hp johnson. I don't have tilt and trim and with flounder gigging and my back not getting any younger I was wondering if anyone else had any expirience in building a tilt and trim unit out of a set of set back plates. I can't figure out the dimensions or angles at which I should mount the cylinders or the linear actuators. ( checking on the actuators soon) Also don"t know if it would be possible to remove the bottom bolts and install bushings in the top holes and use them as the pivot point for the tilt and trim unit. How do I determine the length of stroke and amount of force needed to raise the motor. Also if using the linear actuators will they hold up using them to trim the boat. Another thing that comes to mind is I use the boat in salt water a lot.
Any input form the guru's sure would be appreciated. Thankshttp://forums.iboats.com/images/smilies/confused.gif

 

[Chris1956]

Re: home built tilt and trim

The force necessary to trim the motor under full power will be considerable. Hopefully those acutators are 5/16" aluminum, as that is what PTT units are constructed of.

If you want to just tilt the motor, when it is not running, the force is in the tens of pounds.

 

[belairbrian]

Re: home built tilt and trim

By late 80's I'm guessing you mean 88 or earlier. 89 40's, 48, 50s use acompletly different tilt sytem from 88 year models.

If it happens to be an 89, you can fit it with tilt trim using a used factory cylinder for under $300. I spent $175 on the cylinder and $55 on the switch and remote control parts. other than those you just need 2 relays some wiring and a box to house it. (which cost me about $60).

 

[T-Rex21]

Re: home built tilt and trim

The force necessary to trim the motor under full power will be considerable. Hopefully those acutators are 5/16" aluminum, as that is what PTT units are constructed of.

If you want to just tilt the motor, when it is not running, the force is in the tens of pounds.

Thanks Chis
I think I can find a linear actuator that will do the trick. I know some of the aftermarket tilt and trim units use them. I haven't been able to find the specs or drawings for those. If there is a way I want to stay away from using a used unit as they are getting harder to find than duck teeth and they are rather pricey. The set back plates I currently have on the boat are rated for up to a 150hp motor I'm pretty sure they will take the force of the actuators.