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Thread: Another lonely boat followed me home...

  1. #61
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    First mockup of the exhaust, being a 4 stroke it doesnt need an expansion chamber, all piping is the same ID as the exhaust port, and muffler is a glasspack for 1/5 scale buggy tuned pipe stingers...so rated for 25-30cc motors... i am thinkimg of extending the pipe so the tip of the can is roughly even with or slightly protruding from the back of the boat, to keep any oil drips off the boat...

  2. #62
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    Rudder looks like a good distance and aligned well front to back.
    Brass or even aluminum breakaway screws would be good. If you can get the top screw tight enough, plastic will work. Even a short piece of brass tubing with a zip tie to hold it.
    Creative build, nice job!
    "Look good doin' it"
    See the fleet

  3. #63
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    Thanks! In all my reading it seemed that parralel or slightly behind center of the prop was roughly the best all around placement for the rudder so i made it just a hair past centered...i ended up just going the shear bolt route, i currently have an m4 in it because its what i had...LOL the top pivot is a solid steel pin, not too worried about that... i may back off to the brass idea eventually, but for now its steel... i try to avoid anything big enough to cause issues...LOL

  4. #64
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    Sounds of victory.... fun fact, a Stihl 4mix engine with an 8" black pipe exhaust with a glasspack is actually quieter than a stock 4mix....LOL

    https://youtu.be/tJW9bCFHmys

    https://youtu.be/TNoZRh1VjLo

  5. #65
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    Jun 2018
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    ny
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    Win of the day.... fuel system-sorted. Flex shaft-cut. Stuffing tube-cut and bent. Driveline-success.

    https://youtu.be/OoCY6XKsnsI

  6. #66
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    Just got the rudder mounted as well...

  7. #67
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    First of several black basecoats on.... gonna lay up maybe 3 coats, color sand, 3 more, then lay flake over it.... bottom will be traditional white/cream color...

  8. #68
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    Jun 2018
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    so, havent gotten the flake done yet... but.... progress.....hehehe

    the good... she seems pretty well set up with my eyeballed settings.

    the bad... i didnt get the stuffing tube sealed perfectly.

    the ugly... right after i got this clip i lost the engine died... i had a fishing pole, but that promptly got snagged on everything but the boat... waited it out and it drifted with the wind/current to wheere i could tie a half full pepsi bottle on the end of the line and throw it since my luer was not working too well.... all is well, just need to figure out the stalling..... it fired right back up...

  9. #69
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    Mar 2011
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    BC
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    Ok what was the fuel/oil mix? The engine will shut down due to heat from being lean.

  10. #70
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    fuel mix was 50:1, premium non ethanol fuel and stihl hp ultra mix. same mix i run in everything 2 stroke, including my 94cc chain saw.... and the carb was tuned to the rich side of things.... i wanted to try and get a temp reading on the head but it took 45 min to recover the boat, due to me not wanting to drown in 45°f water... next time i run it will possibly be at a friends pond.l with a jon boat at the ready....

  11. #71
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    also of note, the ebgine is a stihl 4-mix engine, so a 4 stroke that has no oil resevior, and is oiled thru the fuel mix. it did not exibit any sort of sigbs of having gotten to a soft sieze situation, it just acted like it got starved of fuel.

    also of note, the engine is potentially tired....LOL it was floating around the small engine shop that i work at for a year before it came into my possession. (i am a Stihl Certified tech also fyi...LOL)

  12. #72
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    I had stated as my pal got some ‘pre-mix’ fuel from hardware store at 50:1 and it did same thing. I’ve been told 25-30:1 for gas boats

  13. #73
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    good to know, i will try again with more oil....LOL i just kinda figured if stihl says you can run a 94cc saw and work it hard that 50:1 would be fine for a boat....LOL maybe i was way off....LOL

  14. #74
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    so, after a long summer of not running the boat due to house stuff( bunch of projects that needed done) i finally got to get it wet again. i did previously trace the running issue back to the carb being bad, as it wasnt priming up quite right, replaced it and got to run yesterday, ran 7/8 of a tank thru it with no stalling issues.... had a few other issues crop up though...

    i swapped the 1.6p 78mm 2 blade out for a 72mm 1.4p 3 blade since i thought the motor was loaded a bit too much originally, but that could have been due to the carb.... with the 72mm 3 blade, the thing had really bad cavitation though.... if i went over half throttle out of the hole, it would blow out and not go anywhere... fun fact, stihl 4 mix engines run really crappy at half throttle....LOL once on plane it was good, but out of the hole sucked... the original 78mm 2 blade popped out of the hole fine.... would it not having been sharpened cause really bad cavitation?

    also, at the very end of the tank, the flex let loose, got it home and found the Loctite bond had failed in the flex coupler at the prop shaft. would i be better off running silver solder on the flex coupler?

  15. #75
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    I’ve had a slew of loctite shafts come loose lately, so yes silver solder (done right, with thorough cleaning) should be better.
    "Look good doin' it"
    See the fleet

  16. #76
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    well, we shall see when i get the boat out again, i got the shaft soldered, grabbed a wrench on the square drive end and twisted as hard as i could, and it does not spin (for now....LOL) so we shall see if my first attempt at soldering goes better than the first attempt loctiting.... LOL

  17. #77
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    Sneak peak of paint....hehehe finally....

    20200201_120200.jpg

  18. #78
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    A few more... was having difficulty attaching last nite...LOL phone issues

    20200201_114727.jpg20200201_114459.jpg

  19. #79
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    Jun 2018
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    well, last coat of flake went on last saturday, and thanks to user 30nitro, i get to play with more power this year... he had engine parts i was looking for, and i had chainsaw parts he was looking for... long story short, initial parts mockup has begun for an all new powerplant, a B.H.Hanson ported G230pum watercooled 23cc motor! big thanks to 30nitro for that piece of the puzzle... still need a few parts (crank, ignition stuff etc) but we are getting somewhere now... hehe still need to coat the underside white (pearl creme white, hehe) and a few more coats of clearcoat and a good wetsand to level the finish, but man where it has come from when i got it to now... what a difference...

    Attachment 162823

    20200309_110653.jpg
    Last edited by bogieboy; 03-10-2020 at 02:57 PM.

  20. #80
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    Feb 2018
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    PA
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    Great lookin mono...!! Glad i was able to help with the engine parts for the project !!!

  21. #81
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    it certainly came a long way from the original hull that i purchased...and again, i cant thank you enough Don...LOL

  22. #82
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    Hey...my Pleasure...nice to help another RC boater..... lookin forward to some runnin vids........

  23. #83
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    ny
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    So many thanks to Don for the majority of the motor, and a huge shout-out to Al at B.H. Hanson for patiently helping me (23 emails back and forth worth of patience) figure out the rest of the stuff i needed to get it mounted and running. it made smoke (not the bad kind you electric guys LOL) for the first time this morning!!!!!! runs like an absolute champ, and its not even broken in or tuned yet.... now gotta get the water cooling set up, and get my new t-bar mounted and figure out the CG and balance it out, and its ready to go...

    motor.jpg

  24. #84
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    Jun 2018
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    ny
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    finally got the lower part of the hull sprayed, now on to mounting it all up and getting it wet....

    boat.jpg

  25. #85
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    Jun 2018
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    ny
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    getting closer, upon consulting with the guys over at Jims rc boat dock, they told me the wrap to center header would be useless for the mod motor that i have, as the tuned length wouldnt be anywhere near what i would want it... needed to be quite a bit shorter to make the motor sing where it was meant to, so i picked up a different header, and just need to get everything mounted up and get it wet....

    pipenew.jpg

  26. #86
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    Jun 2018
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    ny
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    good/bad news on the build... got it wet last night! sucker books out real good, initial pipe length of 13" to belly is good, but.... didnt get to play very long, as i didnt factor cable windup into the setup when i made the switch to round collet from a square drive clutch on the weedeater motor... the flex lasted about 60 sec before it pulled itself right out of the ferrule on the propshaft... already emailed Al at B.H. Hanson and he is shipping me out a square drive ferrule for the prop shaft...

    as a side note, a prather 270 stainless is very peppy out of the hole on this setup so far, will have to do some more testing....

  27. #87
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    Feb 2018
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    PA
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    Hey...30 nitro here....are you runnin the engine you got from me ?? Sounds like it goes pretty good....not sure on the square drive on that set up..... I've always used collets......

  28. #88
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    ny
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    Yeah, it will still use a round collet on the motor, just a square drive at the prop shaft instead of solder/locktute connection.

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