Official FlightLine 1600mm B-25J Mitchell PNP Thread

[CAPTNG]

Whoa, just saw this. So sorry, Sir. Hope you rebuild. Best, LB

Fortunately for me, it's not me in the video! I don't speak French, but I'd probably give it a good try if this was mine! Merde!

[tab28682]

Quick update - As of yesterday evening (Friday Sept 8th) the B-25 shipment was second in line to be inspected. We expect the customs inspection to take place next week and expect to receive the container the week after. If I had to guess, I would say the container will arrive 10-12 days……

Again, I apologize for the SUPER SLOW delivery.

No apology required, Tom. NOT the fault of MRC in any way.

We do really appreciate the timely updates on the situation. I have never seen a vendor do a better job in keeping the customers updated on a delivery delay.

[Fast N Light]

I think I am following. You want to add the 2nd row of exhaust ducts which are forward and circumstantially offset from the ones on the FL model?
Certainly this could be solved.

Challenges
1) Modeling the duct. I haven't modeled this type of geometry before, so would need to invest some time in learning.
2) Matching the existing ducts. I would likely cover or remove the existing ones to get the set to look same & scale.
3) Attachment to the nacelle. Would be helpful to see what is behind this exposed surface to create the attachment features for the duct.
4) Design for print-ability. Depends on 1 to 3.

If I had the B-25 model in hand so I could get all the needed data, estimate I would take 15 to 30 hours to develop this duct (eg design, print trials & initial installation).

There may be others who can knock this out more quickly - please be my guest!



The modeling challenge is very similar to the gunship nose so I will start exploring with that challenge in the next 2 or 3 weeks.

It's moving along more quickly than I expected. Not quite minimum viable product but a decent 1st draft.

If someone wants to share the HxWxL for the ones on the model, I could refine it. My guess was 4.4x6.8x13mm

Also interested in the nacelle diameter for the curvature of the duct mounting surface. My guess is 70mm...


The .STL file is available on Thingiverse

[MikeT]

Fortunately for me, it's not me in the video! I don't speak French, but I'd probably give it a good try if this was mine! Merde!

Never watch the parachutes,,,,, fly the airplane.

Mike

[Jdcrow]

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.

[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).

[Jdcrow]

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

no. throttle is live

[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

[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.

[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.

[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

[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?

[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

[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.

[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.

[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.

[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?

[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]

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]

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

[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?