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Official FlightLine 1600mm B-25J Mitchell PNP Thread

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  • Originally posted by Jdcrow View Post

    i printed with ASA from Bamboo Labs. Parts printed excellent

    i think i might have measured the axle diameter a little off, or either the ASA filament shrunk. Most Likely the measurement was off a millimeter on the front and main axle size

    mains width at axle fits perfect with the factory supplied spacer.

    nose wheel width at axle is tight. Maybe a millimeter on each face of the wheel removed where the axle head and strut side meet.

    i also noticed the factory B-25 wheel has brass bushings inserted.
    Thanks for the feedback.

    I typically chase precision holes in 3D parts with a drill. For the front the sequence was 3.9, 4.0 and 4.1mm. Used the axle from my Vulcan to test this setup. Small steps minimizes the tendency to drift in a non fixtured setup. Freezing the bits gives me the impression they cut better rather than smearing the polymer.

    I think I can trim up the width on the front axle about 0.75mm per side and still get the cap to work. Do you think that 1mm on the inner hub won't cause the tire to rub on the gear strut? It will be nearly aligned with the rim OD and the tires are wider.

    On the filament - I recently got a roll of Bambu ASA and the jury is still out on it. Have had several 1st layer and spaghetti failures using it, including these rims! More issues than I have had with any other filament. I think the Polymaker ASA and Bambu Generic ASA settings provides a better result overall. Hopefully Bambu will evolve their slicer settings and/or filament composition to improve it's performance.

    After I can complete a check print for the front mods, I will update the .STL files with a reduced width.

    9PM PST - Updates completed
    Scale wheel rims for the FlightLine 1.6m B-25J for use with Robart tires (3.5" Main, 2.25" Front). These rims and tires have been fitted and optimized to fit the B-25. Link https://robart.com/collections/wheels-scale-wheels-2-4Motion RC https://www.motionrc.com/collections/main-wheels?filters%5Bbrand%5D%5B0%5D=RobartThe OEM main tires measure OD 3.33" and the Robart 3.5" measure OD ~3.53". The increased diameter decreases the clearances to the gear strut and doors. Moving the wheel inboard seems to balance these clearances. Removing the OEM 1.75mm aluminum spacer will create space for the outboard gear door to close. A single washer may replace the spacer.The 3.5" Robart mains looks great on the B-25. The fit to the gear strut and outer door is a bit closer than the OEM tire. The Robart tires have ~2mm clearance and do not interfere on my setup.If you want to support my contributions here, please consider leaving a tip https://www.paypal.com/paypalme/ShowmethedenaroMain Wheels Options1) Robart 3.5" Tires on 3.5" printed rims.2) B-25 OEM Main Tires on 3.5" printed rims. Destructively remove the wheel spokes from 1 side of the OEM rim. Remove tire and trim its ID to approximate the printed rim OD. Posted on HobbySquawk https://www.hobbysquawk.com/forum/rc-airplanes/rc-propeller-airplanes/380695-official-flightline-1600mm-b-25j-mitchell-pnp-thread?p=388746#post3887463) Robart 3.25" Main Tires on 3.25" printed rims - This rim appears much smaller and spoils the scale appearance IMHO. It should offer greater clearance when retracted. I don't have this tire so it was not fitted to the rim or plane, but I think it should work. Side by side photo of 3.25", 3.5" and OEM is included in the image set.Robart rim measurements 3.5" OD 47mm, W 23mm. 3.25" OD 41mm, W 21mm.Front Wheel Options1) Robart 2.25" Tire on 2.25" printed G16 rim (G16.2 provides a better grip on the tire)2) TPU Tire on 2.25" printed G17 rim, printed G1 tire - my 1st TPU part design. Pretty basic3) B-25 OEM Front Tire on 2.25" printed G18 rimBuild StepsThe rims are joined with a tapered hex key and are intended to snap together. Recommend securing the rim halves to each other with glue prior to flight. I am planning to use Clear Gorilla Glue (non-foaming) on the OD of the hex pins and along the rim split line inside of the tire ID. Tool Set P04.STL is provided to facilitate clamp fixtures of the Main and Front rims while adhesive is curing.CAUTION: Radial loads on the rims from taxi, take-off or landing may introduce a force which could separate the rim halves. Use your judgement & appropriate countermeasures to ensure this doesn't result in a wheel lockup or wheel separation from the landing gear. This includes blue thread lock on the axle grub screws.Post Print StepsFinish drill the axle holes before installing the tires. Press the hex pin into one half of the rim. Use a fine felt tip pen to accent the timing marks on the OD of the rims and the hex pin peak. Press the second rim half onto the hex pin. The center-line gap between halves should be very small. Step drill the axle holes 3.9, 4.0, 4.1 mm and 4.9, 5.0, and 5.1 mm. Verify the wheels roll smoothly on the axles.Rims are ready for painting if desired.For tire assembly, align the timing marks on the rim ODs and press/snap the hex key into place. Minor cleaning of the rubber flash on the ID of the tires can reduce interference at the rim split line. Hand stretching the tire while squeezing the rim is an effective way to close the gap between rim halves. A bit of strength and a good amount of persistence is helpful. Use a light to verify the split line gaps are same as when axle drilling was performed.I used a single thin metal washer between the rims and the struts both main and front.The front wheel cap is also snap on/off. Removal is best accomplished by using the mushroom head of the installed OEM B-25 axle to apply force from the inside of the cap.

    Comment


    • Originally posted by Fast N Light View Post

      Thanks for the feedback.

      I typically chase precision holes in 3D parts with a drill. For the front the sequence was 3.9, 4.0 and 4.1mm. Used the axle from my Vulcan to test this setup. Small steps minimizes the tendency to drift in a non fixtured setup. Freezing the bits gives me the impression they cut better rather than smearing the polymer.

      I think I can trim up the width on the front axle about 0.75mm per side and still get the cap to work. Do you think that 1mm on the inner hub won't cause the tire to rub on the gear strut? It will be nearly aligned with the rim OD and the tires are wider.

      On the filament - I recently got a roll of Bambu ASA and the jury is still out on it. Have had several 1st layer and spaghetti failures using it, including these rims! More issues than I have had with any other filament. I think the Polymaker ASA and Bambu Generic ASA settings provides a better result overall. Hopefully Bambu will evolve their slicer settings and/or filament composition to improve it's performance.

      After I can complete a check print for the front mods, I will update the .STL files with a reduced width.
      i think you’ve nailed it as is

      Upon further review, and some shifting of the nose wheel axle, i think 7mm exposed axle is same amount for kit and scale front wheel. grub screw marked the axle just at edge of flat spot.

      also noticed the 4 post on the wheel spokes are where they affixed the nose wheel mud/dust cover

      I’m waiting for spare tires to be available from motion before i remove the ones from the kit wheels i have.
      Attached Files

      Comment


      • Originally posted by Jdcrow View Post

        i think you’ve nailed it as is

        Upon further review, and some shifting of the nose wheel axle, i think 7mm exposed axle is same amount for kit and scale front wheel. grub screw marked the axle just at edge of flat spot.

        also noticed the 4 post on the wheel spokes are where they affixed the nose wheel mud/dust cover

        I’m waiting for spare tires to be available from motion before i remove the ones from the kit wheels i have.
        Not knowing their purpose, I left those posts off the front rim. But since you took the effort to educate me, I'll see if they can be arranged cosmetically

        Printed in Polymaker ASA and Bambu ASA with same slicer settings. Quality is comparable, but the Bambu required glue stick to remain adhered to the plate.

        Thingiverse has been updated with this version.
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        • Originally posted by Fighterpilot View Post
          you guys need to read with a little more comprehension. I pay off my credit card every month, so I don't have to pay interest charges. You missed the point all together, that If I were to charge Motion RC the same rate as credit card interest for having my money for two months, they would owe me +/- $100.00. I hope you understand that. I don't normally allow people to charge my credit card and not deliver the product for two months. I understand this is out of the control of Motion RC; however, the situation could be remedied if your payment method was debited upon shipment, not upon order. Simple fix. Hope you guys that commented on my previous now understand and I hope the government gets their act together and releases this shipment.
          By the way Evan D, 20% interest would be about $100.00. I don't understand how you get 114%.
          Now you claim to pay if off every month , so what's your beef? You knew that they would charge your CC when you hit the buy button. You had a choice and you made it. End of story.

          Mike
          \"When Inverted Down Is Up And Up Is Expensive\"

          Comment


          • Just worth a thought,, they all do preorders even here in ozz,, without the preorder money, none of us may hav these awsome aircraft to fly or lookat if u thaat concerned about intrest ,,,, cut the plastic card,, customs r customs,, cant change it

            Comment


            • It's Motions choice to charge upon order. They have said many times that it's their system and no way to change it. I assume that means they would have to purchase a new order management system to make the change. My feeling is that if it's that important then don't preorder or order from a vendor that doesn't charge your card until shipment. For this plane that would be Raymond at RC Castle or Paradise RC but then he's paying more for shipping.

              FighterPilot is just saying he doesn't like the practice, in an exaggerated alternate reality way, but that's all...

              Comment


              • Originally posted by Evan D View Post
                It's Motions choice to charge upon order. They have said many times that it's their system and no way to change it. I assume that means they would have to purchase a new order management system to make the change. My feeling is that if it's that important then don't preorder or order from a vendor that doesn't charge your card until shipment. For this plane that would be Raymond at RC Castle or Paradise RC but then he's paying more for shipping.

                FighterPilot is just saying he doesn't like the practice, in an exaggerated alternate reality way, but that's all...
                I get that but it's just the way it is and it's been that way since day 1. If you don't like the policy, than don't order and just wait till it's in stock. It's a choice.

                Mike
                \"When Inverted Down Is Up And Up Is Expensive\"

                Comment


                • That's what I said too...

                  Comment


                  • Originally posted by Fighterpilot View Post
                    you guys need to read with a little more comprehension...
                    FP, I'd say that goes for each of us.

                    No one, and I mean no one, could have foreseen US Customs choosing this particular container for a complete 100% inspection.

                    This has little to do with any single administration.

                    This is SOP and, frankly, in this day and age it is necessary, IMHO.

                    We all know the 'rules' when it comes to "Pre Orders" and if not, you had an opportunity to ask before dropping your hard earned cash/credit.

                    Motion RC does the pre-orders better than most. We pay our money while rolling the dice, you're either in or you're not. No whining.

                    Respectfully, LB

                    I solemnly swear to "over-celebrate" the smallest of victories.
                    ~Lucky B*st*rd~

                    I don't do this because it is easy; I do this because I thought it would be easy.
                    ~LB~

                    AMA#116446

                    Comment


                    • Tom, any updates?

                      Comment


                      • Originally posted by Fast N Light View Post

                        Not knowing their purpose, I left those posts off the front rim. But since you took the effort to educate me, I'll see if they can be arranged cosmetically

                        Printed in Polymaker ASA and Bambu ASA with same slicer settings. Quality is comparable, but the Bambu required glue stick to remain adhered to the plate.

                        Thingiverse has been updated with this version.
                        Click image for larger version Name:	Screenshot 2023-09-05 222328.png Views:	0 Size:	181.8 KB ID:	385861 Click image for larger version

Name:	IMG_3987.jpg
Views:	666
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ID:	385940

                        now I’m tempted to print out tires. Ha
                        Attached Files

                        Comment


                        • I think they need to update the product page. It still says the planes will be in at Motion RC in early September. Unless they arrive tomorrow the earliest will be mid-September.

                          Comment


                          • No, that would be early-mid-September.

                            If you want early, mid and late you need to divide in thirds or approximately 10 days each, so early is through the 10th. But some may not consider a mid and only do early and late in which case it would be early through the 15th.

                            But I do expect an update soon. Motion has been much better than other companies for keeping us posted.

                            Comment


                            • I took the liberty to update the ETA on the product page to late September just to play it safe(r). If Tom learns of any change he will update accordingly. I'm waiting for mine too!
                              My YouTube RC videos:
                              https://www.youtube.com/@toddbreda

                              Comment


                              • Originally posted by Jdcrow View Post
                                now I’m tempted to print out tires. Ha
                                Hah, great minds think alike. Best, LB
                                I solemnly swear to "over-celebrate" the smallest of victories.
                                ~Lucky B*st*rd~

                                I don't do this because it is easy; I do this because I thought it would be easy.
                                ~LB~

                                AMA#116446

                                Comment


                                • We have not had an "official" update since Aug 30. Do we have any idea as to when this shipment is going to be released? I see the Motion RC website is still telling prospective customers that the shipment is due in Motion RC by early September.

                                  Comment


                                  • "The first shipment of the B-25s will now arrive at Motion RC in early Sept, 2023." Maybe they are still expecting it in early September?

                                    And you are aware that the second shipment arrived first and people have been flying planes from that shipment for a couple of weeks. And you are also aware that the third shipment is due in at Motion any day and may arrive before the delayed first shipment.

                                    Other than that if you want info maybe calling Motion or PM'ing Tom may get you more info.

                                    Comment


                                    • Are we there yet... are we there yet....
                                      ya'll sound like a bunch of whiny brats!.
                                      Aros and the rest of the motion staff are just as pissed as we are about the situation.
                                      ​​MRC has been absolutely up front with everything they know about the delivery date and will continue to do so. So riding their ass isn't winning any friends or influencing the situation one bit.

                                      So stow the heat on our favorite radio control company and cut them some slack.
                                      and let's get back to being friends and enjoying this forum.
                                      We have B-25's to talk about.

                                      Comment


                                      • Wow, you guys are some sensitive people. Didn't think my comment was that out of line. Now the question is, how long is a reasonable wait time? I understand this is through no fault of Motion RC, but sometimes you don't need to play the blame game, you just need results, no matter whose fault it is. I have been more than pleased with Motion RC and their customer service, and I'd venture to say that I've spent more money than most of you at Motion RC over the last 4 months. I simply disagree with the policy of charging people for a product and not shipping for over two months. This is not going to be the last airplane I order from Motion RC, but it will be the last airplane that I preorder.
                                        And for those of you that are still confused about my credit card comment, let me clear this up by saying I never have to pay interest on my credit card because I do pay off whatever balance I have monthly. No, I'm not out of pocket interest on this preordered B-25. Just out of pocket for the cost of the model....for two months now. Trust me, this will not cause me to miss a meal. So, to the few of you guys that were offended, take a deep breath and relax, this too shall pass. It is truly amazing how ugly some people can get when hiding behind a computer screen.
                                        FMS P-51B 1400 mm
                                        Durafly T-28
                                        1875 mm B-17 (lost in midair with FW-190 at Bomber Field)
                                        Flyzone DE Havilland Beaver
                                        Durafly 1200 mm F4U Corsair

                                        Comment


                                        • It is so hard to be patient!
                                          Love the wheels Fast N Light! Click image for larger version

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                                          Attached Files

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