Roban - World Class Scale Helicopters

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500 Size AH-64A Apache build

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  • Originally posted by Gravythe clown View Post

    Yeah I have a 450 MD500e and MD530. Easiest tear-down and rebuild for maintenance ever. I'm currently in the maintenance stage of my MD500e, Had to order and replace the 5 bladed head.

    I'm really looking forward to the 600 MD500 G-Jive build. I have the Roban 5 blade head already. I have ordered some blades to use just to get it all set up, but when the scale blades come back in stock I will order a set as well.

    Speaking of blades I need to comb through the thread here to see if F106DeltaDart posted where he got those nice scale blades for the Apache. I'm going to need a set of them.

    Gravy
    Congrats on taking on this guy as your next project! It’s not been easy, but it definitely is a great looking kit. My best advise is keep it light. This would minimize your stress on the main gear, which is the critical component that my heavy machine tends to over stress. The belt drive tail should help in that department.

    The swept tip blades are available here: http://www.ehirobo.com/copterx-multi...ain-rotor.html

    Lots of great 3D printed upgrades available here as well: https://www.fine-scalemodela.com/ah-64-apache1.html

    For power system, 1700 rpm should be a good target. That’s around a 1400 KV motor with a 14T pinion. Do not use less than a 13T pinion as it puts a lot of stress on the gear. The old RC Aerodyne manual actually had a warning against this printed in it.

    If you have any questions on the build, feel free to send me a PM or post here. I think over the past few years, I’ve managed to find just about every random issue that it could throw at me.

    Comment


    • Thanks, I actually went back in the thread and found your post on the blades. Already ordered. I don't know why I didn't think of that my self though as I'm using the Ehirobo blades on my 450 MD500 and MD530.
      Just got my shipping notice from Motion. It will be here next Thursday, but as I said, I don't even have the mechanical 500 set yet. I won't even buy one until summer time.

      Thanks also for the 3D print link, I'll most likely add all the bits to make it look cool. Printed in 50/50 Flex and regular resin make for good parts that wont easily break.

      Gravy

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      • So I’m looking at using a scorpion 3026-1000kv with a 15t pinion. That should give me a head speed of 1600rpm with 25% headroom using 4s.
        should be a good head speed.
        I have the the motor and a CC talon 90 coming.
        still need to get the 500 mechanics. I’m on the prowl.

        gravy

        P.S. cobra is in the repair shop so to say. The guy thinks three to four weeks and I’ll be ready to repaint.

        Comment


        • Originally posted by Gravythe clown View Post
          So I’m looking at using a scorpion 3026-1000kv with a 15t pinion. That should give me a head speed of 1600rpm with 25% headroom using 4s.
          should be a good head speed.
          I have the the motor and a CC talon 90 coming.
          still need to get the 500 mechanics. I’m on the prowl.

          gravy

          P.S. cobra is in the repair shop so to say. The guy thinks three to four weeks and I’ll be ready to repaint.
          I would personally go a bit higher on headspeed. The thinner chord blades require a bit more than your average blades, and the tail fin has some strange blockage effects on the tail rotor. I had to go up to 1900 rpm on mine just to get enough tail rotor authority to keep it from blowing out. Hopefully, you won’t have this issue at lower weight, but I’d personally leave enough headroom to get the 1800rpm,and target around 1700 for initial testing/tuning.

          Comment


          • I originally ordered a 1400kv which would have put me at 1700 with a 12t pinion. However I was told Informed today by the shop that they were out of stock. What I really wanted was a 1200kv. I was unable to find what I needed but did find the 1000kv. So I ran the numbers and they matched up with my 700 Apache at 1600 rpms. So I picked it up. I would really not like increasing my pinion any more than 15T. So I’ll give it a try and go from there.
            On another note, how difficult is it to install and or remove the mechanics from the fuse?

            Gravy

            Comment


            • Originally posted by Gravythe clown View Post
              I originally ordered a 1400kv which would have put me at 1700 with a 12t pinion. However I was told Informed today by the shop that they were out of stock. What I really wanted was a 1200kv. I was unable to find what I needed but did find the 1000kv. So I ran the numbers and they matched up with my 700 Apache at 1600 rpms. So I picked it up. I would really not like increasing my pinion any more than 15T. So I’ll give it a try and go from there.
              On another note, how difficult is it to install and or remove the mechanics from the fuse?

              Gravy
              It's a bit of pain to remove them with the raised tail and all. It's also a very thin fuselage, so there is some twisting and careful work involved in their removal.

              Comment


              • So just like the cobra. I figured that but was preying for better. The cobra was a PITA. I actually had to do fuselage boom repair after final insertion. My cobra had no clearance at all for the tail riser transition that had to stay on the boom while inserting it. Really pissed me off.

                I’ll get the curse book out and ready.

                Gravy

                Comment


                • Hey F106, did your kit come with decals? Mine didn’t. Not sure if supposed to be included or not.

                  Gravy

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