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Thread: Outboard Motors

  1. #1

    Default Outboard Motors

    Has anyone use the Outboards ,,, Sprint F3 Outboard ,,, HobbyKing H2O Style 650EP Outboard

    What one would you pick to put on a 24" - 28" Mono


  2. #2


    That's a cool little motor, cables are the week spot it breaks and you lose prop and dog every time.

  3. #3

    Default F1 CNC Outboard

    I ran two of my Dragon Hobby F1 boats last summer and lost one prop and dog because I was in deep water. Started running in two feet of water on a sand bar in the upper Niagara. Broke a couple dozen flex shafts but found all the parts. Another member here has suggested trying to use a stainless steel needle bolted in the tower housing exhaust port that extends down to block the prop shaft from coming out of the gear case housing. He has sent me a few samples to try. I'll fabricate one soon and post a photo. Also going to look into the possibility of using 0.130" cable a 0.010" increase in diameter. I have already discarded the Teflon "bushing" for 0.1875" brass tubing. I will share my results. Almost finished painting and decorating a plain white boat to look like my friend Wyatt's boat. Minor detail work ahead. Need some warm water too!
    Last edited by Jeff39; 01-15-2019 at 04:14 PM. Reason: picture didn't load

  4. #4

  5. #5


    get the sprint motors and upgrade the motor

    that H2O cnc'd mercury wont push a 28 hull well at all you will just break every shaft trying to push that weight

    I ran twins on a Pursuit, but had to upgrade the shafts using OSE bulk its a bit bigger & better quality I almost stopped breaking shafts unless I get real aggressive and keep in mind thats running twins taking a lot of the stress off each flexie..... the HK H20 motors shaft radius is too tight to work, shame its a great looking motor

    then I switched to a pair of the Sprint motors that I already like and never break shafts! I am even lazy about lubing these motors I trust them so much
    Im getting 42mph but still am in setup stage so there is a little more
    Last edited by MadProps; 01-16-2019 at 01:35 PM.

  6. #6


    I am impressed. Very nice work that you do. I'm sure you are probably right. I'm not ready to give up on these CNC Merc's yet however. The only reason I got back into this hobby was because of the scale appearance of the lower units on these motors. I'm not in it for speed as much as scale appearance. I will take a closer look at the Sprint motors though. Today I went to Field's Hobby Shop in Cheektowaga, NY and bought some larger diameter flex cable. I hope I can get that to work. I would love to see more of your work, Madprops, that twin outboard job looks great. I love outboards, my first real boat was powered by a 1922 2 1/2 Johnson. My first A/B Runabout had a Mark 20 Merc with a Quicksilver lower unit. Eventually I raced a Cotton Craft B Stock Runabout with a Merc 20H. That was long ago. I love F1 Tunnel Hull Racing and helped out in the Pits with a real full scale team not long ago. I look forward to more advice and suggestions from you experience R/C guys. Thanks, Jeff
    ChampBoat.jpgWyatt going in h2o.jpgDSC01409.jpg

  7. #7


    here is a video of the Sprint motors running I think I can find a video of the twin EP 650s
    but they weren't as responsive both in performance and handling, the extra lower unit of the sprint in the water increases handling but slows it down and the leopard motor upgrades over came that, I still need to install the counter rotation prop and shaft to see how much more I can get and over come the high speed oscillation the hull goes thru

  8. #8


    Very cool! Thanks for sharing.

  9. #9


    What motor did you use to upgrade the sprint...?? I put an 1800kv Heli motor on one but have not tried yet....

  10. #10


    I too tried the heli motors but decided to upgrade again with the leo's they are leopard 2860's, I think the longer shaft gives a bit more torque, the 2845's will also work well

    I also upgraded the EP650 motors with 2845 2960Kv 3y and the 2830 water jackets. I run them on 2 4s 5000mah one for each motor and long run time

    I dont care for the cowls of the sprint motor so I am making my own cowls from a couple cowl sets from the HK EP650 motors
    Last edited by MadProps; 01-17-2019 at 01:36 AM.

  11. #11


    Nice....well mabe i'll try the leopard 2845....I have one mounted on a Miss Geico 24......I'm not a fan of the cowls either....I'm interested in what you come up with....

  12. #12


    You can buy the EP650 cowls separate, so I have already taken a dremel to 1 set to get a proof of concept

    you can see I just need to do a bit of glass work at the gap between the 2 halves

    Last edited by MadProps; 01-16-2019 at 11:34 PM.

  13. #13


    Oh boy...can't see the pics...

  14. #14


    can you see this one



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