davegee , Dave, what is the axle diameter of the Flightline Corsair's MG? Best, Steve
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Official FlightLine F4U-1A Corsair 1600mm (63") Wingspan
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Originally posted by Elbee View Post
I will come up with something. The downside is keeping things light and sufficiently strong. I have been messing with printing CF filament, though it isn't as strong as you'd think. I will also try PET-G and nylon-based filament. We'll see, until then, more when there is more. Best, Steve
Dave
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Those wheels are Chinese so pretty sure they're 5mm which is a bit larger than 3/16. I have not measured.Fly low, fly fast, turn left
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Originally posted by nuts-n-volts View PostThose wheels are Chinese so pretty sure they're 5mm which is a bit larger than 3/16. I have not measured.
Cheers
Davegee
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I have not unpacked the wings from the shipping box, so any verification as to the actual axle diameter is greatly appreciated. Not certain whether to mod the Robart OEM hub or design something new. Again issues will be which print filament to use either way. I do think it was quite clever of Robart to design the wheel as to make it difficult to use anything other than their parts. Great vertical integration technique, but limits usage for us modelers.
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Ok... Corsair main axle is 5.03mm/.198". Wheel hole is 5.16mm/.202". Mind you that it's a bit more difficult to get a consistent measurement on a small hole like this, but I think I got it pretty close. Digital Caliper
Btw... the FMS F7F main axle that I showed you the wheel for is 4.92mm/.1935". A little smaller, but very close. Could be made to work. ...I know, that's probably my deal. Your hubs look great LB!Fly low, fly fast, turn left
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Originally posted by nuts-n-volts View PostOk... Corsair main axle is 5.03mm/.198". Wheel hole is 5.16mm/.202". Mind you that it's a bit more difficult to get a consistent measurement on a small hole like this, but I think I got it pretty close. Digital Caliper
Btw... the FMS F7F main axle that I showed you the wheel for is 4.92mm/.1935". A little smaller, but very close. Could be made to work. ...I know, that's probably my deal. Your hubs look great LB!
It's not perfect, that's why I was enthused on the possibility of printing some that fit better on the Corsair axle. If not, I plan on continuing flights using what I have set up on mine.
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davegee,
.25" OD K&S Brass Tube has an ID of .205-.215"+/- which is 5.2mm-5.45mm.
I don't know if that would be too sloppy a fit, but a bushing from that stock would be both inexpensive & easy.
Best, LB
I solemnly swear to "over-celebrate" the smallest of victories.~Lucky B*st*rd~
You'll never be good at something unless you're willing to suck at it first.~Anonymous~
AMA#116446
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But you have a point. I think I'll try some new tests with brass bushings again to see if I can come up with something better than I had with the last attempt. Robarts definitely improve ground tracking and cushion landings better than stock tires. I especially found this true with the E Flite 1.5m P-51D that made a world of difference for that plane.
Will report back any progress I have on the brass tubing for the Corsair. Oh, and I finally broke down and ordered a digital caliper. The analog one I've had forever must have some errors in it that the digital ones don't. Plus, it's easier to read on aging eyes!!
Cheers
Dave
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Originally posted by davegee View Post
Thanks, LB. That was one of the first avenues I went to to try and use the Robarts wheels. For some reason, I found they didn't work out so well, and then started routing out the Robarts bushings that I am still using on my Corsair.
But you have a point. I think I'll try some new tests with brass bushings again to see if I can come up with something better than I had with the last attempt. Robarts definitely improve ground tracking and cushion landings better than stock tires. I especially found this true with the E Flite 1.5m P-51D that made a world of difference for that plane.
Will report back any progress I have on the brass tubing for the Corsair. Oh, and I finally broke down and ordered a digital caliper. The analog one I've had forever must have some errors in it that the digital ones don't. Plus, it's easier to read on aging eyes!!
Cheers
DaveI solemnly swear to "over-celebrate" the smallest of victories.~Lucky B*st*rd~
You'll never be good at something unless you're willing to suck at it first.~Anonymous~
AMA#116446
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Originally posted by Elbee View Post
Hey Dave, I had an "Ah-ah" moment, does the Robart wheel use 'wheel collars' to attach to the Flightline axle or a "C" Clip? And if it is a "C" Clip, did you or Hugh Wiedman regroove the axle? Best, Steve
Dave
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Thanks, Dave, the reason i asked was I did not leave any tolerance between the 3DP hub insert and the back of the opposite Robart PEM wheel hub. I was concerned that the 3DP insert would interfere with the axle. Easy enough fix in the design by creating a space should that be the case. You might let me know when you reassemble your Robarts. Best, Steve
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Hi Steve: that sounds excellent! Although my plane works fine with the drilled out Robart axle bearings, I would be very interested at any time to test out anything that you might print up. This might also give you confidence that when you assemble the wings on your beautiful Corsair that you will be able to use the Robarts without unforeseen problems.
Please PM me sometime if you get a few completed for test. You can let me know the details like cost for the parts, shipping, etc., if you are amenable to that.
Cheers
Dave
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Originally posted by Hugh Wiedman View PostOK, Abwagner121 and John Wood, (clever Mod though) maybe adding gasoline to the fire and I'm sure I'm going to "ruffle some feathers", but if you learn to land consistently with power and ease it on the runway perfectly flat at around 28%-35% throttle (depending on flap deflection and wind) with the mains touching first, then reduce throttle and let it settle in, you shouldn't have a problem cracking the gear casing or bending the worm screw. I've probably got over 70 flights/landings with my current gear and they're still in one piece (probably just jinxed myself). As I've said before, I probably went through at least 6 main gear retracts in my first 15 flights trying to 3 point it in or just not landing correctly that way. After watching tons of videos and listening to pilots experienced at scale landing of warbirds, I changed my landing technique and it's been smooth sailing ever since. You can 3 point the Spitfire (but it too likes to land flat, with some speed, on the mains and sure looks more scale) with no gear issues due to the landing force not being taken on by the worm gear, but this Corsair will just not let you get away with that more than a few times, or even once. I used to call the Corsair retracts my "Independent and Unbiased Assessment Meter of my Landing Technique". I even set my timer to tell me when the throttle is at 40% (approach throttle setting) and 34% and 28% for landing speed. The throttle does not go below 28% until it's rolling on the runway, flat for about 10-15 feet.
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Originally posted by Elbee View Post
Hey Dave, I had an "Ah-ah" moment, does the Robart wheel use 'wheel collars' to attach to the Flightline axle or a "C" Clip? And if it is a "C" Clip, did you or Hugh Wiedman regroove the axle? Best, SteveHugh "Wildman" Wiedman
Hangar: FL/FW: Mig 29 "Cobra", A-10 Arctic, F18 Canadian & Tiger Meet, F16 Wild Weasel, F4 Phantom & Blue Angel, 1600 Corsair & Spitfire, Olive B-24, Stinger 90, Red Avanti. Extreme Flight-FW-190 Red Tulip, Slick 60, 60" Extra 300 V2, 62" MXS Heavy Metal, MXS Green, & Demonstrator. FMS-1700mm P-51, Red Bull Corsair. E-Flite-70mm twin SU-30, Beast Bi-Plane 60", P2 Bi-Plane, P-51.
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Originally posted by Abwagner121 View Post
Yes, that reply does "ruffle my feathers" a little bit! I'd like to tell me where the airfield exists that you don't have any wind issues of any kind. The club that I fly with has an airfield off of a lake so you can get wind gusts at ANY time. I've also had the retract servo crack with a perfect touchdown. Now, if you fly this bird off of grass, that makes it even more likely that you'll have issues. While your landing style may work for you, it may not work for everyone because all airfields are not the same & have different variables involved.Hugh "Wildman" Wiedman
Hangar: FL/FW: Mig 29 "Cobra", A-10 Arctic, F18 Canadian & Tiger Meet, F16 Wild Weasel, F4 Phantom & Blue Angel, 1600 Corsair & Spitfire, Olive B-24, Stinger 90, Red Avanti. Extreme Flight-FW-190 Red Tulip, Slick 60, 60" Extra 300 V2, 62" MXS Heavy Metal, MXS Green, & Demonstrator. FMS-1700mm P-51, Red Bull Corsair. E-Flite-70mm twin SU-30, Beast Bi-Plane 60", P2 Bi-Plane, P-51.
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Originally posted by Hugh Wiedman View Post
Elbee, for some reason I seem to remember that I used a collar with a set screw and some nylon washers to make it fit right, then just put the Robart wheel insert in. Wings are in bags now so next time out I'll drop the gear and check, but pretty sure I used a collar as I remember it was a little difficult getting the correct allen wrench in that was short enough to fit since the collar was recessed in.I solemnly swear to "over-celebrate" the smallest of victories.~Lucky B*st*rd~
You'll never be good at something unless you're willing to suck at it first.~Anonymous~
AMA#116446
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Maidened my Corsair this morning. Flew fantastic. Just a few clicks of up trim needed. I had mixed in a tiny bit of down elevator with the flaps but this caused it to nose down slightly so I removed it on the 2nd flight. Great companion for my Spitfire. The FW190 is another members. Best of WW2 together!!!
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