Official FlightLine 1600mm B-25J Mitchell PNP Thread

[Tom]

B-25 UPDATE - The customs inspection has FINALLY been completed. There were no issues with the inspection as expected. I have all hands on deck trying everything possible to get this container to Motion RC as quickly as possible. I'm cautiously optimistic we may receive this late next week but I'm not ready to bet on that just yet. I'm not sure if we can get this moving at this point on a Friday.

[Fast N Light]

FNL - Been trying to upload an image with some measurements, but HS is simply not taking it. If you are looking for a total swap of the "glass" , it's a bit more than HxWxL, but basically at the back the height I get is 65mm. From the bottom of the "glass" to the gun port is 62mm and from the gun port to the back is 142mm. The width I get at the back is 92mm and tapers at the front to about 75mm. Along the side from the back to the edge of the "lower glass section" is 105mm.

At least those were the measurements I got. They are NOT exact simply because my caliper is too small to make all of the point measurements, but MAYBE, just MAYBE this will help you get in the ball park. The image would make more sense, but I have tried numerous times to get one to load. It won't.

Good luck and hope the info is useful.

I probably should been a little more clear in my description. The design has moved forward quite a bit since then, so I can make some images.

At present H80xW60xL75mm


For the cutout

At present H1 28xL1 57mm


I realize these will be approximate dimensions but those will help quite a lot. Thanks!

[Larry D]

FNL - Been trying to upload an image with some measurements, but HS is simply not taking it. If you are looking for a total swap of the "glass" , it's a bit more than HxWxL, but basically at the back the height I get is 65mm. From the bottom of the "glass" to the gun port is 62mm and from the gun port to the back is 142mm. The width I get at the back is 92mm and tapers at the front to about 75mm. Along the side from the back to the edge of the "lower glass section" is 105mm.

At least those were the measurements I got. They are NOT exact simply because my caliper is too small to make all of the point measurements, but MAYBE, just MAYBE this will help you get in the ball park. The image would make more sense, but I have tried numerous times to get one to load. It won't.

FINALLY got it to load.

Good luck and hope the info is useful.

[Fast N Light]

Would someone please measure the HxWxL for the nose glass/canopy?

Planning to use the perimeter for the attachment of the gunship nose. My guess was H80xW60xL75mm

[Larry D]

Odd that the Replace Parts list both escs as 50A, but image shows one is 50 Amp opto and one is 60 amp 5v 7amp ubec.

Still cant get them to go into calibration mode. Both are operating, just dont believe im getting full throttle out of them.

Curious JD if maybe you have tried ESC calibration one at a time. Have you tried unplugging the 6S adapter (EC5 to XT60) and use a 4S with XT60 to see if you can get each (or either) side to calibrate?

[Elbee]

If that is the case then I'd say you're very close in shape. Now it's about actual dimensions. Nice work.

[Fast N Light]

Fast N Light Am I correct to presume the cross section you are showing is 'upper right' looking nose on? Best, LB

Yes that's probably the best perspective explanation for the pair of photos. However, the nose of the B-25 shown seems to have symmetry top/bottom, left/right, so it could be any quadrant...

[Elbee]

Fast N Light Am I correct to presume the cross section you are showing is 'upper right' looking nose on? Best, LB

[Fast N Light]

Started working on the gunship nose and having some success with lofting to generate geometry in the CAD tool. 1st time for me 😃.

Using this approach i generated 3 curve sets which control the geometry (blue lines in the 1/4 section view shown). Each curve is composed of 3 tangent arcs. By trial and error with these 18 variables, I could use this to generate something representative with the model in hand. However, that will take some time and won't be scale.

Wondering if any of you would help me locate the scale geometry for the nose?

[Jdcrow]

FreeWing made by HobbyWing. Note it’s opto, no BEC.

https://www.motionrc.com/products/fl...-1179593751520

Odd that the Replace Parts list both escs as 50A, but image shows one is 50 Amp opto and one is 60 amp 5v 7amp ubec.

Still cant get them to go into calibration mode. Both are operating, just dont believe im getting full throttle out of them.

[LucB]

FreeWing made by HobbyWing. Note it’s opto, no BEC.

https://www.motionrc.com/products/fl...-1179593751520

Thanks Evan.
Must be this one that took fire, because the remaining one is the ESC with BEC. Despite the manual says "ESC 50A Brushless x2 7A UBEC", I assume only one is with the UBEC.

Now wondering for the motor, because flames went trough it, and it is darkened and smells horrible.

[LucB]

Can you strip off the burnt shrinkwrap and read any identifying markings on the ESC to possibly determine its mfg?

Unfortunately, nothing to read anymore.

[Evan D]

FreeWing made by HobbyWing. Note it’s opto, no BEC.

https://www.motionrc.com/products/flightline-50a-esc-096d002002#mz-expanded-view-1179593751520

[ridgerunner]

... I connected the battery, I got a huge electric spark at the battery connector and immediately a "pof" (sounded like a capacitor explosion) and flames coming out of the (right) nacelle. ...

Yipes!!! (and bummer! )

Can you strip off the burnt shrinkwrap and read any identifying markings on the ESC to possibly determine its mfg?

[Elbee]

Thanks LB

The current design is based on what looks right from those photos and my expectation of the aircraft size. Run what you brung approach...
Since its a nonfunctional scale detail, severity of the 'failure' modes seems very very low.

we share similar design methodologies.

My thought was Motion didn't add the additional ducts due to proximity, i.e., could these mold properly being so close to one another.

Best,LB

[Fast N Light]

FnL, Looking good, Sir. Your design work is top notch.

If your scaled dimensions for the part are good, the size can be adjusted in both CAD and slicer programs.

Thank you sharing your STL Files.

Best, LB

Thanks LB

The current design is based on what looks right from those photos and my expectation of the aircraft size. Run what you brung approach...
Since its a nonfunctional scale detail, severity of the 'failure' modes seems very very low.

[LucB]

I have a similar ESC calibration problem now after the loss of one ESC (fire). I connect the second ESC (with UBEC) directly to the receiver, plug the 6S lipo and it is only beeping (about one beep per second) and no way to get out of this mode. Cut-off disabled. I can't find on MRC the ESC manual. Is the second ESC dead too?


About the ESC on fire (posted on FB group) I had 7 flights of 5 minutes with an Admiral 5000, no issue, plane flights great, maybe a bit fast to be fully scale, and still have 48-50% of capacity available, flying at 50-60% of throttle. But climbing to the sky when flaps are down.
I wanted to program the elevator compensation for the flaps last weekend at home, when I connected the battery, I got a huge electric spark at the battery connector and immediately a "pof" (sounded like a capacitor explosion) and flames coming out of the (right) nacelle. It was impossible to unplug the battery (electric soldered). No other choice than pulling everything that could come with it (the power cable of this ESC came with it). The inside of the nacelle is a bit melted, as well the engine plastic cover and the yellow cover, and 2 holes in the nacelles where the ESC is located. I could avoid a total loss by unassembling as fast as possible the wing and the nacelle while still black smoke was coming from that nacelle.

I raised a ticket on MRC site on Sunday evening but still no return to date.

[Elbee]

...moving along more quickly than I expected...a decent 1st draft.

FnL, Looking good, Sir. Your design work is top notch.

If your scaled dimensions for the part are good, the size can be adjusted in both CAD and slicer programs.

Thank you sharing your STL Files.

Best, LB

[Jdcrow]

Do you have throttle cut on? Calibrate with throttle cut off (motor live).

no. throttle is live

[CAPTNG]

Is there a "Special Callibration" process for the ESCs? I cant get them to go into calibration mode. Just keep getting the constant beeping that indicates throttle is above no throttle position.

i have throttle function on both banks. Just dont feel like im getting full throttle. Waived off the maiden attempts yesterday as it didnt feel like the aircraft was rolling out with any speed on take off.

This is the First Freewing or Flightline model Ive had it not work. including B-24, F-14, Me262.

Do you have throttle cut on? Calibrate with throttle cut off (motor live).