Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Page 1 of 4 123 ... LastLast
Results 1 to 25 of 94

  1. #1

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Brushless Balaenoptera Musculus

    Hey fellow modders :-)
    I have gone and purchased another toy boat to mod
    I really like building these boats; it gives me no end of pleasure.
    It’s relaxing to sit at home with a beer, some music and modify these boats, then take them out and see how much better they run. Bring back home, repair something or modify the boat further, just to squeeze a bit more out of it, I love it :-)
    Damfurst on this forum started an awesome build with dual brushless motors, using the original drive train. I’m wanting a single motor, I think it’ll be easier to maintain and build (plus that’s what I’d want anyway)
    The plan is to run a 3/16inch flex shaft setup to a strudder (stinger with a rudder behind it)
    I’ve heard people say lots of confusing things about the flex setup, and because this is my first ever prop boat, I’m probably not understanding the advice.
    The general thing I understood were the parts involved, but sizes seems a bit odd.. With some shops only selling certain bits?!? Anyways, I found this listing, and that’s what I believe I’ll be going with
    The kit contains everything I need, so I can learn all the bits and how they work together
    Motor wise for this thing, I’m thinking something in between 2860 and 3660… It just depends what sort of Kv rated motors I can get… 2500Kv on 3S and 3300Kv on 2S seems to be the goal
    I’ve gutted the boat, and sanded it down. I’m going to put some putty in all the little cast holes
    I really want a 100% smooth bottom surface, as I’d like to hit 50+ km/h with this thing
    Cheers
    Martin
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Ay73953.jpg 
Views:	50 
Size:	79.2 KB 
ID:	1817925   Click image for larger version. 

Name:	Bw72547.jpg 
Views:	49 
Size:	189.6 KB 
ID:	1817926   Click image for larger version. 

Name:	Pu51293.jpg 
Views:	58 
Size:	40.4 KB 
ID:	1817927   Click image for larger version. 

Name:	Oi15342.jpg 
Views:	42 
Size:	31.7 KB 
ID:	1817928  

  2. #2

    Join Date
    Oct 2010
    Location
    sydney, AUSTRALIA
    Posts
    66
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    Yeeooow "The Blue Whale" only to be used in water!..

    Looks the goods mate, i'm watching what your doing as i don't have a clue on prop boats....lol

    50+k's should be sweet. looks as tho you've been busy, man i hate sanding!
    Inside hull pics would be good once you get the chance also.
    SCX10 Truggyx2, Wraith
    Ota R31, 16FM, D3.

  3. #3

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  4. #4

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    Mikeup you are a f..in legend!!!  That information is GOLD! In fact, I've copied it in case it went away due to a crash!!

    I am totally keen for offset rudder now that you mention maintenance (as I am not hesitant to run my gear in salt water)
    When looking for rudders, I must ask, what do I need to look for? Does it have to be further back than the prop?

    e.g. if I went with a stinger, say 70mm or so long, would the rudder HAVE to be behind the prop on the stinger? (checking to find out how long it needs to extend back)

    Thanks again for parting with your knowledge, I really appreciate it

    Cheers
    Martin

  5. #5

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  6. #6

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    Mike, you are a wealth of information!!! Thanks so much for parting with it
    I will do some research and post up some new rudder/drive train combos

    Thanks
    Martin

  7. #7

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    Hi Mike,

    I went to Hobbyking to see what stuff they might have, and I'd like your oppinion please





    The transom on the boat is bowed, so I'd need to make a small mounting pod for the stinger, which should push it out the few extra mm if required

    What do you guys think?

    Cheers
    Martin

  8. #8

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I also found a potential motor


    and a bit more information


    Cheers
    Martin

  9. #9

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  10. #10

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    LOL Mike, your message cracked me up Thanks for your research and time

    If I followed Mike right, using the Hobbyking stringer and rudder I suggested above, should do the trick
    By adding a small pod for the stinger, I can' move the exit of it, back 9mm or so, in line with the leading edge on the rudder.

    I'll get those parts and the motor shipped over this week, then I'll figure out this flex shaft assembly, which is still somewhat fuzzy for me... 
    (When I get the stringer drive it'll be clearer, as that's the part I don't get, if they are made for a specific sized tube, or you space that out with sleeving the inside...)

    Someone please clear it up for me is it stRinger or stinger? I've seen both...

    Cheers
    Martin

  11. #11

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  12. #12

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm looking at buying hardware today

    What is a 6 pitch prop?

  13. #13

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    OK, the list is nearly complete... Boat is intended for 3S

    Motor: 
    XK3665-B-2500KV Brushless Inrunner
    36 Size Adjustable Motor Mount with Water Cooling
    Water Cooling Jacket for 36mm Brushless Motor

    ESC:
    Not sure, will update

    Running Gear:
    all 4mm gear
    Flex cable with end (approx 300mm long)
    Outer tube (Use with teflon liner, 300mm long, 6mm x 0.2mm thick)
    Drive dog
    Threaded prop nut
    Teflon thrust washer (to use between drive dog and strut end)
    Teflon liner (Suits 4mm cables, 300mm long, 4.5mm id x 5.5mm od)

    This is paired up to a 70mm long 4mm adjustable Stinger

    Rudder:
    130mm X 32mm wide Rudder dual pickup version (130mm deep X 75mm offset rudder with dual pickups, Uses kick back funtion for safety, mounting bolts included)

    Servo arm, piano wire or what ever
    Servo arm boot
    Metal Gear Digital Servo - MG995 - 15kg thrust

    Props:
    ???? 33mm - 36mm at what pitch? 1.4? I want to buy a small selection of props, preferably plastic, that I can then test out, and buy the better cnc prop after that...

    What do you guys reckon?

    Cheers
    Martin

  14. #14

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  15. #15

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    Hi Mike,
    I found those on OSE, and then I thought to myself, I really aught to do myself a favour and figure out what 6 pitch is... I got it (http://www.modelpowerboat.com/conten...136-propellers)
    Using your graupner as an exampleiameter 36mm, Pitch 57mm. This is nearly the same as: 36 x 1.6 x 4mm prop
    Now to find some over this side of the pond, coz at $21 shipping, they are a bit too expensive...
    Could I go a larger sized diameter with a 1.4 pitch, or does that put too much strain on the motor?
    Or should I go the smaller diameter, but with a bigger pitch?
    Cheers
    Martin

  16. #16

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    also, I know from my ski boat, more blades gives a better hole-shot, e.g. faster acceleration and better turning... I doubt it's desired in an R/C boat, but what are the pros/cons?

  17. #17

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    here's one... maybe? gotta drill out to 4mm hole size, but that'd be OK

    35mm 2 Blade EP CNC Boat Prop (P1.7 D1/8x2)

    Light weight and precision CNC machined.

    Shaft: 3.25mm
    Weight: 1.6gram

    $18.08

  18. #18

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  19. #19

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    maybe I'll get it later, just placed an order for the lot!!!!
    Thanks again for your explanations... I ended up gettting a 37mm 1.4 pitch prop... Had to have something LOL (I'll research for other shops here in Oz)
    ~$300 all up, with postage... It's a little more than I wanted to spend, but I wanted it... So what can you do?
    MOTOR:
    XK3665-B-2500KV Brushless Inrunner - $39.13 (HK)
    Shaft Adapter - 5mm motor shaft to 4mm Flexi Shaft - $4.96
    36 Size Adjustable Motor Mount with Water Cooling - $14.99 (ebay)
    Water Cooling Jacket for 36mm Brushless Motor - $16.69 (ebay)
    ESC:
    Turnigy Aquastar 120A Watercooled ESC $69.56 (HK)
    Water Outlet Barb - $2.99 (ebay)
    Servo:
    Metal Gear Digital MG995 - 15kg - $7.83 (ebay)
    Flex-Rod Boots - $1.14 (HK)
    Servo Con-Rod for Boat Rudder $2.47 (HK)
    Running gear:
    All from RC Boat Bitz, South Australia
    4mm drive dog $3.00
    4mm outer tube $4.00
    4mm threaded prop nut $3.00
    4mm flex cable with end $15.00
    4mm teflon liner $4.00
    130mm Rudder dual pickup version $38.50
    Stinger 70mm long 4mm adjustable $25.00
    4mm teflon thrust washer $1.00
    37 x 1.4 x 4mm prop $15.00

  20. #20

    Join Date
    Oct 2010
    Location
    sydney, AUSTRALIA
    Posts
    66
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    Good to see the project moving ahead Martin. I've realised that i need a lot of schooling on prop boats thats for sure.
    SCX10 Truggyx2, Wraith
    Ota R31, 16FM, D3.

  21. #21

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    LOL, Mike's your man!!
    In all fairness, once you figure out how to read the different prop numbers, it's a bit simpler...
    The site I quoted above, has that part down pat!
    Understanding diameter of the prop and pitch (which is the distance the prop travels forward on 1 revolution, theoretically) and shape is pretty much all there was to it...
    To get the top speed, I believe Mike did the following calculation
    33mm diameter at 1.6 pitch (calculated pitch x diameter = distance travelled by one revolution) would yield
    re">
    re"> 33 x 1.6 = 52.8mm/ revolution
    re"> 2500KV motor @ 11.1 volt = 27750rpm at full throttle
    re"> 27750rpm x 52.8mm = 1465200 mm/minute
    Converting this to a bit easier figure = 87.912 km/h THEORETICALLY
    However, in reality, the prop slips in the water, and so you loose anywhere between 15% - 30%, so 67.6 km/h is possible...
    The shape of the prop, determines it's efficiency to a large degree
    Other factors play in at these speeds as well, coz now you have tremendous drag from the hull to think of, plus that massive fin, total weight, water conditions etc
    I'd really like to figure out what the heck the different diameter has an effect, I think it pushes more water, so you'd think higher speed. I think it comes at the cost of engine heat... anyone care to clarify?
    Cheers
    Martin

    PS. I'll bring my boat down to Brissy when I've built it, can show it all to you then I'm sure I've got a fair bit to learn yet

  22. #22

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    oooooooooohhhhh * SLAPS OWN FOREHEAD*
    ofcourse!!
    if you have a larger diameter prop, it will travel further per RPM at the same pitch compared to a smaller diameter prop
    e.g.
    33mm x 1.6p vs 37mm x 1.6p = 52.8mm vs 59.2mm per revolution

    The prop I purchased, 37mm x 1.4p = 51.8mm/revolution, which equates to a theoretical top speed of86.247 km/h, so still capable of ~50+ km/h
    Hoping the motor doesn't get too hot
    Thanks brain... it's Friday, I need a drink hahaha

  23. #23

    Join Date
    Jul 2010
    Location
    Aberdeen, UNITED KINGDOM
    Posts
    1,003
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    In RC planes the pitch determines top speed the diameter determines thrust.

    There is no point having a very high pitch (good top speed) if there is not enough thrust (diameter) to get you there.

    Pitch=speed
    Diameter= thrust/acceleration.
    Happy Landings

  24. #24

    Join Date
    Jan 2011
    Location
    Clive, IA
    Posts
    439
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    I'm done.

  25. #25

    Join Date
    Jan 2012
    Location
    Sunshine Coast, AUSTRALIA
    Posts
    288
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Brushless Balaenoptera Musculus

    cheers Mike I've got a hight quality 120amp ESC, which I've tried and tested before, it should muster whatever that 36mm motor can demand
    As for prop size, thanks for the clarification, I thought there would be more work for the motor with a larger prop... I'll get some more when they become available, I like experimenting anyway

    cheers
    Martin


Page 1 of 4 123 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 10:36 PM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.