Weed eater engine conversion

[DUCKSHOT]

Ripped off could you send me an email at benrod2@yahoo.com?
I'd like to ask some questions about your motor which looks awesome!

[Greg Berlocher]

I have some questions about the prop and tiller mount. Could you please e-mail be at bigredfish@aol.com. I sure would appreciate the help. Thanks. Greg

[Jimbo1490]

I want to make one of these myself. For the benfit of all looking at doing this, you should check into using an RC boat prop. Most are for super go-fast boats, but not all. There are RC tugs and the like as well. Here's a few item #'s I dug up on ebay that might work OK:

6015534980
150002787430
150028259797

You could email that seller and tell him what you are up to and he could probably make a recommendation. Weedwhacker type engine conversions are common in the RC boat world, FYI.

The pricing is very reasonable given the precision of these props. Octura makes a bewildering variety of props, so they probably make one that should work well.

Jimbo

[DUCKSHOT]

Hello where is evryone at? Did someone get a reply from ripped off or caveman and not sharein?
I've noticed that these 2 cats have looged on but not replyin.
Anyone get some good ideas?
The split here in Louisiana is gunna start in about 2 weeks and I'd like to start my motor before the split stops and starts again.

[DaveH1]

Great thread, let's keep it rolling.

I am converting a sit-on-top kayak to a lay-on-my-back duck hunting scull boat, had thought about cutting the shaft on my trolling motor.

This would essentially create an ultra-short-shaft (like 7-10") electric outboard mounted on a fabricated transom.

Now y'all have got me thinking about going with a mud-motor orientation similar to Ripped Off's rig. Fewer design challenges with steering, plus the rig could be more easily moved to one of my canoes if I wanted to.

Ripped Off, is your transom mount pivotable side-to-side, or just up and down? It looks fantastic!

thanks,

dave

[sledhead]

i was just talking to a friend of mine about doing this. alot of lakes up here do nott allow gas engines because of the oil into the water factor. this will work great cause they can't say a whole lot when no oil is floating behing the boat. we are getting too old to paddeling the boat back after the battery has died from trolling.

[wblakewsx]

forget the 90 degree turn, do it like they do in Thailand

[DaveH1]

Is it time to think about adding a removable Kort nozzle to this rig to improve efficiency when traversing deeper water?

A nozzle would probably impede progress in muddy conditions, so making the nozzle in a manner that loosening a clamp would allow it to be slid up the shaft, then reclamped once it is above waterline might be best.

If it were detachable from the shaft, it would be one more thing to get lost/misplaced...

thoughts?

dave

[sledhead]

got the thing all set up. had a lot of trouble finding a prop to fit the shaft ont the weedeat, then the shaft turns the wrong direction. so i flipped the prop and it works. granted won't be as effective due to the prop working ing reverse.

now i'm making my own version of a Go-Devil. have a 5hp briggs i'm rebuilding with a little extra umph. gonna run a shaft out about 5 foot and mount the prop. should work just as good as the go devil but cheaper.

[gonzo]

Flipping a propeller around doesn't change the way it turns.

[zero gravity]

has anyone done a twin weedeater setup?

reason I ask is I got a 15' gheenoe 110 lbs fiberglass hull and I'm looking to push it between 10 to 15 mph

I got two weedeaters not sure on the cc's ,got all the way through this thread saw that "ripped off" got his up to 5mph

so I guess my question would be would twin weedeaters get me up to at least 10 mph? thanks in advance for any help or advice

ohh this is my first post by the way
great thread and site
have you guys seen the weedeater outboards on smalloutbardmotors.com

[gonzo]

You need four times the power for twice the speed. However, because you are also adding weight and drag with a second motor, it is probable closer to five times.

[sledhead]

making both engines run the same speed may be a problem also.

[zero gravity]

thanks for the input guys

I was thinking of connecting both trigger accelerator cables to a single trigger

the setup would have both engines mounted on a single horizontal bracket with a pivot point x axis single shaft on both fabricated from aluminum tubing with some sort of skeg on both. Guess I would need to place a stabalizer bar or tube between the two output shafts to keep them from flexing when turning. Fab up a tiller handle with trigger and engine stop button wired to both engines and make some exhust tubbing so it runs down towards the props

I'm a rookie when it involes twin anything but would one weedeater have to right rotation and the other left or would I get away with both being right?

went out to look at the weed eaters I got there both 31cc guess that might not work for the speed I want 10 to 14 mph mayby two 55cc's might get it there. The boat a "gheenoe"wieghs 110lb I come in at 250lbs. Hull has had a 4hp 2 stoke on it that pushed it 12mph on a plane on a good day with the wind at my back and it has had a 15hp which was like riding a jet ski topped out at 24mph
so my main concern would be to get it up on a plane at a low speed mayby a mod to the output shaft with a hydrofoil copy made out of sheet metal might help with getting up on a plane for this low hp setup

gonna make up some drawing tonight not on cad or anything like that just a simple sketch

agin thanks for all the input

[donochud]

if you just take the spool off the end of the weed eater and replace it with a prop from a trolling motor. you can mount the weed eater on a 360' swivel caster just below the throttle handle. it will push two grown men in a canoe at
5 mph