Official FlightLine 1600mm B-25J Mitchell PNP Thread

[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).

[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.

[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

[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

[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.

[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!

[Elbee]

While we are all (patiently?) waiting here's a little video to pass some time with a reminder to always fly the plane. Low altitude tip stalls are a bummer! (see 16:00 of maiden)

https://youtu.be/5AeKV1wPMZk?si=mDRaJWkIuIMjo77r

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

[CAPTNG]

I wonder if the FlightLine designers decided to drop the 2nd row of exhaust ducts in the service of streamlined looks v accuracy. I'll probably not do this mod.

[Red Flyer]

FYI, The cowling exhausts and prop blade proximity to the cockpit windows caused B-25 pilots and co-pilots to lose hearing. Pilots left ear hearing deficit; co-pilots right ear. True!

Truth. I once (and only once) removed my headset while flying C-GCWM Hot Gen!

I thought my head would explode.

Red Flyer

[rlcamden]

Thanks for the update, Tom.

[Jdcrow]

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.

The SQUADRON/SIGNAL Publications are a great resource for us Scale Nerds. Especially the Walk Around Series. Lots of good information. For example the B25 Walkaround shows lots of pics of the Exhaust Stacks, and also notes many times they were modified or had those covers removed for ease of servicing when stacks broke loose. Many can still be found. and on Amazon I picked up one as soon as i preordered the aircraft. B-25 Mitchell - Walk Around No. 12: Lou Drendel, Don Greer: 9780897473798: Amazon.com: Books

[desertdrifter7]

Tom,, thank you for the update and thank you for updating the product page. It is a terrible position to be in. We eventually will get ur planes.

[Fast N Light]

The exhaust routing for the engines was changed for the B-25 with the C/D versions.
instead of exiting out the rear of the engine cowlings with multiple cylinders collecting together. The individual exhausts from then on were routed thru the sides of the cowlings making a marked change in the appearance of the cowlings.

I definitely think a 3D printing would be a much better solution.
SpadDriver

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.

[CAPTNG]

FYI, The cowling exhausts and prop blade proximity to the cockpit windows caused B-25 pilots and co-pilots to lose hearing. Pilots left ear hearing deficit; co-pilots right ear. True!

[Spad Driver]

See!.
who else would give us updates on a weekend!.
That's why I buy from MRC.👍
mic drop.