The Seagull 40+ won't push FH at all. The Silver Century would on a canal (I've seen a 70' steel narrowboat pushed by one) but that's zero current and no wind. They had trouble steering. Don't try and use them, you'll be at the mercy of the wind and you'll have no steerage.Even if they did work, you'll spend more time running back and forwards refuelling them that you will going anywhere.OK Hotrod I have some useful info for you re the old outboard motors you have on your deck if they are indeed British Seagulls.
These are quirky old units but there is a British web site that is a mine of useful info especially on getting the ignition system to work.
Also be aware that the gas oil mix required can be as low as 10 to 1. Most run on 25 to 1 but it is important to know which motor you have and if it has been modified to run on a different mix.
If I had to choose two low power motors to move something as big as the FH they would be high on the list. They were designed to push heavy displacement hulls not lightweight planing dinghies. It might be worth giving them a try. However as others have said I really think you need more power. I have seen some large catamarans working the tourist day trade out here in the Caribbean with two 40hp OBs on a central drop down bracket. The lengths would have been comparable to the FH but the windage on the FH may be an issue.
Also I do not think any Seagull was made with a reverse gear but I could be wrong on this. The ones I used in the 60s certainly did not, in fact most were direct drive. The larger Seagulls did have a foward and neutral lever from memory. There were two types of gearbox and prop on some models the larger one was the high thrust model and was called the barge pusher.
I've got one of each here. The barge pusher (Silver Century)has a neutral, but some of the larger ones don't.
The only way to tell what 2 stroke mix to run these on is to look at the jets and compare with the info on the Saving Old Seagulls site.
If it's any help, they were designed to be maintained in the 3rd world by Africans with hammers and adjustable spanners. DO NOT EVER try and use a flywheel puller on one-the flywheel will break apart.
If you're desperate, they were designed so you can use normal mineral motor oil instead of 2 stroke oil, but this can ONLY be done if it's meant to run at 10:1 premix. IF you do run them on mineral motor oil, don't go ANYWHERE without a spark plug spanner as they whisker up and they stop regularly.
The Saving Old Seagulls site sells the shear springs.Don't go anywhere without spare ones as they break if you touch the bottom.
If you need help with them PM me, I'm in the UK and I've used these motors all my life.My normal cruising area is the town where they were built when new.
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