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Thread: Proboat Zelos G 48" Cat Gas Powered!

  1. #91
    Join Date
    Jun 2011
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    ct
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    Default zelos

    Quote Originally Posted by Scratcher405 View Post
    I have two of these Zelos 48G's and two members of our club each have one.

    They all run about 44mph bone stock and are a blast. A 1.4 pitch prop will get you to 45-46 mph and fixes any clutch issue. We all had to fiddle with them and run 2 or 3 tanks of gas to get them running well.

    I'm sure we'll have these boats running 47-49mph as we learn to dial them in.

    But even at 44-45 mph running these boats all together is such a blast. I'd like to get another so I can join my two sons and have 5 of these all running together.

    Spray WD40 in the clutch housing and get needle clamps for the carb, also run the NGK CMR7H.

    My one son has flipped his 3 or 4 times and it always lands prop side down and keeps running. I think these are the most fun boats on race day.

    any hull cracks? what prop are you running? glad someone experienced took a chance. think I'm going to buy one. thanks
    Last edited by urbs00007; 09-07-2018 at 08:51 PM.

  2. #92
    Join Date
    Jul 2018
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    OH
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    No hull cracks.

    We're finding the stock (B&S) prop get's us best speeds so far, 46 mph. Still tuning, next weekend we hope to reach 47 mph, still 100% stock.

    We did start running with out the canopy, seems to help. W/O the canopy we've added a 1.5" windshield at 45 deg. and wind deflector at the back of the canopy opening to prevent the parachute effect. I'll try to post pictures.

  3. #93
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    Aug 2009
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    NJ
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    Quote Originally Posted by Scratcher405 View Post
    No hull cracks.

    We're finding the stock (B&S) prop get's us best speeds so far, 46 mph. Still tuning, next weekend we hope to reach 47 mph, still 100% stock.

    We did start running with out the canopy, seems to help. W/O the canopy we've added a 1.5" windshield at 45 deg. and wind deflector at the back of the canopy opening to prevent the parachute effect. I'll try to post pictures.
    Have you guys tried running a 257 full mod carb on any of them? It may get u some more power. You can also run a copper head gasket for more compression and pick up some power there. Gas boats was my thing for years. I'm currently resurrecting my full mod express craft thunderbolt.

  4. #94
    Join Date
    Jun 2011
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    ct
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    Quote Originally Posted by Scratcher405 View Post
    I have two of these Zelos 48G's and two members of our club each have one.

    They all run about 44mph bone stock and are a blast. A 1.4 pitch prop will get you to 45-46 mph and fixes any clutch issue. We all had to fiddle with them and run 2 or 3 tanks of gas to get them running well.

    I'm sure we'll have these boats running 47-49mph as we learn to dial them in.

    But even at 44-45 mph running these boats all together is such a blast. I'd like to get another so I can join my two sons and have 5 of these all running together.

    Spray WD40 in the clutch housing and get needle clamps for the carb, also run the NGK CMR7H.

    My one son has flipped his 3 or 4 times and it always lands prop side down and keeps running. I think these are the most fun boats on race day.
    can you say where you set the strut to run best? needle valve settings? just bought one. going to try stock prop and prather 270. how often should I spray wd 40 into clutch housing? thanks

  5. #95
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    Jul 2018
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    OH
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    Low Speed needle 1 1/4
    Hi Speed needle 1 3/8
    Be sure to get a needle clamp, or needles moved at WOT.
    Haven't even moved the strut yet, it's flush to the bracket at the top I believe.
    WD40 clutch about very full tank of gas or when you lube the flex shaft. Or every time you flip the boat.
    We're running 46 mph w/o the canopy on.
    Sunday we'll be testing with and with out the velocity stack.

  6. #96
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    Jul 2018
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    OH
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    Oh yeah, NGK spark plug in the "7" heat range (I forget the full NGK number)
    Also running VP110 fuel with Yamalube 2R

  7. #97
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    Jul 2018
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    OH
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    Ngk cmr7h

  8. #98
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    Jun 2011
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    ct
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    Default zelos

    Quote Originally Posted by Scratcher405 View Post
    Low Speed needle 1 1/4
    Hi Speed needle 1 3/8
    Be sure to get a needle clamp, or needles moved at WOT.
    Haven't even moved the strut yet, it's flush to the bracket at the top I believe.
    WD40 clutch about very full tank of gas or when you lube the flex shaft. Or every time you flip the boat.
    We're running 46 mph w/o the canopy on.
    Sunday we'll be testing with and with out the velocity stack.
    just read the instructions for cable greasing. seems like alot of work. anyone come up with an easier way? appreciate your help setting this boat up. seems well made overall. one thing I don't like, though, is nylon thrust washers at the strut between drive dog and strut. have you seen significant wear of the washers? going to run sunday. have a couple props to try. also going to try larger 2 blade props with the strut set even with bottom of rear sponsons. more like a surface drive if you will. I have a zelos 48 electric, hull only which I ran with a 10s motor. torque roll was too much until i raised the strut. will let you know how I make out. thanks again.

  9. #99
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    Jul 2018
    Location
    OH
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    Zippkits has a bearing to replace the nylon thrust washer between the drive dog and strut. It's actually acetal, not nylon. Just ordered a few to try out.

  10. #100
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    Jul 2018
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    OH
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    We got up to 48 mph today with the Zelos 48g, 100% stock.
    We put the velocity stack back on and angled the prop strut about 5 degrees to raise the bow. (It used to be level with the top of the strut mount)

    50 mph is within reach for sure, just need to spend time fine tuning the carb needles and prop strut.

  11. #101
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    Jun 2011
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    ct
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    ran the boat for about an hour. stock prop worked well. impressed with handling. one problem however, the steering servo won't center. my friend has the boat and haven't looked into it. is it waterproof? some water got in, not much, though.

  12. #102
    Join Date
    Dec 2018
    Location
    FL
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    Been out of the RC business for a long time but my wife is getting me a new Zelos 48G for Xmas. I've been a good boy I guess! So might have a few new questions. First one I can think of is if the boat will run about 45 minutes how long will the receiver battery last in the boat?

  13. #103
    Join Date
    Dec 2010
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    NY
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    Quote Originally Posted by h2oskidude View Post
    Been out of the RC business for a long time but my wife is getting me a new Zelos 48G for Xmas. I've been a good boy I guess! So might have a few new questions. First one I can think of is if the boat will run about 45 minutes how long will the receiver battery last in the boat?
    you should start your own post for a better response

  14. #104
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    Oct 2008
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    ca
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    lol
    "Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
    --Albert Einstein

  15. #105
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    ca
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    Quote Originally Posted by h2oskidude View Post
    Been out of the RC business for a long time but my wife is getting me a new Zelos 48G for Xmas. I've been a good boy I guess! So might have a few new questions. First one I can think of is if the boat will run about 45 minutes how long will the receiver battery last in the boat?
    If I had a 48” gasser I would definitely run a large receiver pack with a castle BEC to compliment its larger fuel tank that I would install, probably tap into the existing fuel tank with a MSR fuel bottle
    "Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
    --Albert Einstein

  16. #106
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    Jun 2011
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    CA
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    Problem: engine cuts out at 1/2 tank. Checked for air leaks and adjusted carb, still cuts out. Any tips? TIA

  17. #107
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    Jun 2018
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    ny
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    any deterioration of the fuel line? sound to me like a crack in the pickup line in the fuel tank. when the tank is full, no problems... once it gets to the level of the cracked line, sucks air. OOOORRRRRR.......LOL is there a check valve in the tank to allow the tank to release vaccuum form the tank? tank might be pulling vaccuum, and starving carb...

  18. #108
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    Jan 2012
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    al
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    I just picked up one of these for cheap because people don't understand gas boats. It's in great shape only ran twice. I brought it home striped out the stock motor, clutch, and driveline. Installed a new zenoah g300pum that was modified by Mike Ross, used a speedmaster collet in place of the clutch, installed a speedmaster drive shaft, and a prop works 7016/3-400-LL. I took it out to break in the motor today and I like this boat a lot. At a minimum through the clutch in the trash change out the driveline and prop, you will have an reliable boat that you can enjoy.

  19. #109
    Join Date
    Aug 2020
    Location
    NY
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    I have recently picked up a Zelos 48, and felt like I needed to respond to this thread ( although it is quite old). When I ran my boat for the first time out of the box, I had the same symptom reported here ( stab the throttle and nothing but revving to the moon). I debated whether or not this was clutch slip or cavitation, and remembered the debate in this thread. I dropped the strut 1/8" from the factory location, and the boat drove entirely different. The prop now digs hard, and the boat is decently quick ( 37mph or so) running very wet and with some power left on the table carb tuning wise. I expect this boat to be in the low 40s without too much work, and it should hit 50 with a well worked prop and finished tune.

    The good:
    The boat seems well built. Finish is great looking, all parts look decent hardware wise. Engine is strong running and has been consistent and responsive to tuning out of the box.

    The not so good:
    The cooling system is not the best. The line for the cylinder head needs to be bored out for sure, and I am contemplating a dual inlet head and dual inlet rudder.
    Rudder deflection with the stock radio is pretty bad ( and no end point adjustment).
    Forget about turning left. This boat has serious right side percentage, and loves to rip turns to the right. Turn left under power in any capacity and things get dicey. This could be counterbalanced with weight, but its not that serious.

    Some video from today:

    https://youtu.be/--83-WsC09Y

  20. #110
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    Jun 2011
    Location
    ct
    Posts
    826

    Default 48 cat

    Quote Originally Posted by Ricoswave View Post
    I have recently picked up a Zelos 48, and felt like I needed to respond to this thread ( although it is quite old). When I ran my boat for the first time out of the box, I had the same symptom reported here ( stab the throttle and nothing but revving to the moon). I debated whether or not this was clutch slip or cavitation, and remembered the debate in this thread. I dropped the strut 1/8" from the factory location, and the boat drove entirely different. The prop now digs hard, and the boat is decently quick ( 37mph or so) running very wet and with some power left on the table carb tuning wise. I expect this boat to be in the low 40s without too much work, and it should hit 50 with a well worked prop and finished tune.

    The good:
    The boat seems well built. Finish is great looking, all parts look decent hardware wise. Engine is strong running and has been consistent and responsive to tuning out of the box.

    The not so good:
    The cooling system is not the best. The line for the cylinder head needs to be bored out for sure, and I am contemplating a dual inlet head and dual inlet rudder.
    Rudder deflection with the stock radio is pretty bad ( and no end point adjustment).
    Forget about turning left. This boat has serious right side percentage, and loves to rip turns to the right. Turn left under power in any capacity and things get dicey. This could be counterbalanced with weight, but its not that serious.

    Some video from today:

    https://youtu.be/--83-WsC09Y
    clock wise is normal course for rc boats. the props turn counter-clockwise and the prop acts as a paddle wheel, pulling the transom to the left. this has a tendency to pull the boat to the right and turning the rudder adds to this pulling right. going left is going against this . that's why it doesn't like to go left. by the way, what is rudder deflection??

  21. #111
    Join Date
    Aug 2020
    Location
    NY
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    Quote Originally Posted by urbs00007 View Post
    clock wise is normal course for rc boats. the props turn counter-clockwise and the prop acts as a paddle wheel, pulling the transom to the left. this has a tendency to pull the boat to the right and turning the rudder adds to this pulling right. going left is going against this . that's why it doesn't like to go left. by the way, what is rudder deflection??

    I get whats going on with the forces back there, just being spoiled not being able to rip the boat both directions hahaha. Rudder deflection is pretty much throw, on a middle or high end radio you can just mess with the EPA ( end point adjustment) and make it so the servo throws further in one or both directions for sharper turns. Based on what I have seen from this boat, I would probly leave the throw alone for the left turns, and maybe crank in some more throw for right turns making the boat a touch more aggressive. Just my .02

    That said I'm resisting the urge to just shop for more prop for this thing and cheat my way to 50mph, however I want to try to do it the "hard" way first truly box stock.

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