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  • 1945dave
    Senior Member
    • Mar 2012
    • 304

    #211
    Hey Battlefury, sorry to confirm what you have already found out. Carbon Fiber interferes with the GPS signal. They make for certain GPS units an external antennae that would be required for CF applications, otherwise think radar gun.

    Dave

    Comment

    • Chrisg81983
      Fast Electric Addict!
      • Jul 2011
      • 1556

      #212
      Originally posted by cugino
      I have never seen bended blade of CNC prop. When CNC prop fails it is usualy thrown blade like on prop on picture bellow. Thats my experience and exprerience of my colegues. [ATTACH=CONFIG]79703[/ATTACH][ATTACH=CONFIG]79704[/ATTACH]This prop threw its weakest blade under 24k rpm @ 4kW measured with ET in my MHZ Cougar boat.
      That is exactly what I mean now imagine what can happen at 40k. Many people I know are throwing blades NOT BENDING them. I have seen many of my friends Boats get damaged from this, and I am not about to put a hole in my Hpr just for a cnc'd prop. I will stick with octura props for now. Plus a lot of the cnc props that I saw in person still needed some work to get them 100 % so I really don't see a benefit on this one.
      my youtube videos http://www.youtube.com/user/chris81983?feature=mhee

      Comment

      • 1945dave
        Senior Member
        • Mar 2012
        • 304

        #213
        Thanks Chris, I have several CNC props and I have a ton of other brands as well. Mostly for Nitro power however. I don't think I ever approached 40,000 rpm's but have come close to 30,000. I have bent and twisted and even sheared various props. I believe I understand where you are coming from. To my way of trying to grasp what is happening I feel these props are failing much like they would if you hit them with a hammer and the blade breaks off. I also believe we are limiting the term CNC to mean aluminum machined props as opposed to Stainless Steel machined props. All of Octura's props are cast metal regardless of the metal composition.

        Dave

        Comment

        • nata2run
          customcfparts.com
          • Nov 2011
          • 1837

          #214
          Originally posted by battlefury
          I saw a hpr "bulletproof" 135 @ hydroworld forum for sale very tempting to pull the trigger hmmmm...
          Just pull the trigger LOL
          Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
          "Follow someone's footsteps and you will always be a step behind"

          Comment

          • nata2run
            customcfparts.com
            • Nov 2011
            • 1837

            #215
            Originally posted by cugino
            I have never seen bended blade of CNC prop. When CNC prop fails it is usualy thrown blade like on prop on picture bellow. Thats my experience and exprerience of my colegues.



            [ATTACH=CONFIG]79703[/ATTACH][ATTACH=CONFIG]79704[/ATTACH]

            This prop threw its weakest blade under 24k rpm @ 4kW measured with ET in my MHZ Cougar boat.
            There has to be a difference in quality on those. I have aluprops that I would question too. The one in the picture looks abit like it. My new CNCprops look way different than those and are made from 7575 aluminium. Not starting an argument here and if it turns out this one is for real and also made of 7575 then ok "they throw blades" I spin mine over 30k rpm and I'll try to spin them 40 as well. If they throw anything I won't use them again. Hopefully they don't blow a hole in my new cat. Look at my MHz 138 thread "last pages to see the props" they look way stronger.
            Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
            "Follow someone's footsteps and you will always be a step behind"

            Comment

            • drwayne
              Fast Electric Addict!
              • May 2008
              • 2981

              #216
              7575 Alu props are super hard, but super hard materials can be brittle under shock load.. titanium for eg.. you can hit it with a 'big' hammer and breaks/shatters !.
              Impact stress ... fractures without warning.
              I have used Alu on tests to choose SS/BeCu size before mods .....just because they're cheap.

              I understand the craze for these CNC Alu props.. "sharpened and balanced, ready to go".
              Ideal for the 'off the shelf' racer.

              Ive a local mate who ran cast BeCu props out of the bag .. now uses the Alu CNC gear. 'coz they're better'.. .. go figure !



              regs
              DocW
              Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
              @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

              Comment

              • srislash
                Not there yet
                • Mar 2011
                • 7673

                #217
                These props still need some work though guys as Chris said.I have found them out of balance and in need of sharpening.But that is me.A couple of guys I run with also think nothing of beaching the boat when bringing it in.Lord knows what a hit from that may do to a props future.

                Comment

                • nata2run
                  customcfparts.com
                  • Nov 2011
                  • 1837

                  #218
                  Ive been lucky, firstly I'll state that if I dont like something....you'll never hear the end of it! back to my CNC props, if I for some reason didnt like them I would jump on them. I always check for ballance on any prop, as I believe anything out of ballance can be dangerous, including people. After I checked for ballance I sit them on the ballancer, Inside a box, hold up a big sheet of thick acrylic to protect myself :) and spin the prop with compressed air. that way they spin atliest 5k rpm on the thin needle point. Now if they were out of ballance they would fly off from wobbleing.

                  @ Doc. yes there are a lot of "out of ballance ppl" out there too LOL, but ofcause the CNC props would be better than any out of the box prop. I woldnt get 2 blade CNC props though as I can S/B those, but making it a bit harder with the 3 blades. Reason why I got the 4818/3's
                  Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
                  "Follow someone's footsteps and you will always be a step behind"

                  Comment

                  • drwayne
                    Fast Electric Addict!
                    • May 2008
                    • 2981

                    #219
                    Kent, buddy.
                    You're a good mate..eager, enthusiastic, and sometimes intuitive .
                    How ever .. go read up on prop balancing... you guessed that wrong.
                    Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
                    @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

                    Comment

                    • nata2run
                      customcfparts.com
                      • Nov 2011
                      • 1837

                      #220
                      Originally posted by drwayne
                      Kent, buddy.
                      You're a good mate..eager, enthusiastic, and sometimes intuitive .
                      How ever .. go read up on prop balancing... you guessed that wrong.
                      What part exactly is guessed wrong??
                      Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
                      "Follow someone's footsteps and you will always be a step behind"

                      Comment

                      • drwayne
                        Fast Electric Addict!
                        • May 2008
                        • 2981

                        #221
                        Originally posted by drwayne
                        Kent, buddy.
                        You're a good mate..eager, enthusiastic, and sometimes intuitive .
                        How ever .. go read up on prop balancing... you guessed that wrong.
                        http://www.offshoreelectrics.com/inf...andbalance.php

                        Sorry for pirating the thread for a mo ..Srislash..
                        I do enjoy your improvements.. it's why I keep returning !
                        W
                        Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
                        @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

                        Comment

                        • nata2run
                          customcfparts.com
                          • Nov 2011
                          • 1837

                          #222
                          Have read all of that a few times, sorry where did I guess wrong??? or made the wrong statement??.....no piont making me read all over again. It would be like telling you to go back to school :)
                          Please point out to me where I'm wrong? instead of just teling me to go read up on ballancing, I think I made clear I cant ballance a 3 blade to well yet! so I make do with the CNC.
                          I have no problems ballancing a 2 blade and can do to the extend where it dont wobble spinning 5k rpm on the prop ballancer. (I do this after its in perfect ballance on the ballancer)

                          Sorry Shawn..... for the H.J.
                          Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
                          "Follow someone's footsteps and you will always be a step behind"

                          Comment

                          • drwayne
                            Fast Electric Addict!
                            • May 2008
                            • 2981

                            #223
                            Answer your telephone !

                            my comment re balancing .. fast spin wont show issues to the naked eye very well.
                            Last edited by drwayne; 06-26-2012, 09:14 PM.
                            Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
                            @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

                            Comment

                            • nata2run
                              customcfparts.com
                              • Nov 2011
                              • 1837

                              #224
                              My point was... fast spinning unballanced, or out of ballance props on the prop ballancer will wobble badly, or throw off the prop entirely. I'm asuming we are talking acceptable finished props here, not Andy B. or Jorn O. Be realistic, how many ppl here can look at the boat behavior and say.....ok, take off the prop, file a little here and there, bend a little here, then back in the pond for a 100% perfect setup. There probably are.! but I'm not one.

                              ...fast spin wont show issues to the naked eye very well. Agree!! 100%, but you will hear or feal the vibration if not in ballance.
                              Visit www.customcfparts.com | Custom Boat Building | Custom Carbon Fiber Parts | Custom Graphics | LMT Premium Dealer | MGM Premium Dealer | YouTube | Facebook
                              "Follow someone's footsteps and you will always be a step behind"

                              Comment

                              • Chrisg81983
                                Fast Electric Addict!
                                • Jul 2011
                                • 1556

                                #225
                                Try static balancing with some kind of strobe light that's if you want to take balancing to a new level
                                my youtube videos http://www.youtube.com/user/chris81983?feature=mhee

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