Xfly Models B1B Bomber 70mm

[J42day]

The throttle channel is not working on that AR8020 went in another direction using AR8360 and by passing stock gyro thanks for the help..

[kallend]

Just put my B1B together today it will went well except ESC's won't arm just goes "beep-beep" everything else work fine tried everything I know check wires tried another receiver checked all connectors to no avail any help appreciated.

Did you try an ESC calibration?

[Evan D]

Sort of. They beep because the ESC doesn't sense that the TX is at low throttle. It's not a trim thing (though that may bandaide it) it's a throttle calibration thing.

[RRHandy]

Just put my B1B together today it will went well except ESC's won't arm just goes "beep-beep" everything else work fine tried everything I know check wires tried another receiver checked all connectors to no avail any help appreciated.

Did you put the trim on the radio all the way down on throttle? That is why most of the time the esc's beep.

[J42day]

Saw on RC Groups that The Bone doesn't AR8020 Receivers put an Admiral 10 channel in with Sat. done the trick ESC Initialized straight away😁

[J42day]

Just put my B1B together today it will went well except ESC's won't arm just goes "beep-beep" everything else work fine tried everything I know check wires tried another receiver checked all connectors to no avail any help appreciated.

[Aros]

Dougcarr73 I am sorry about your crash man. I too think the second theory is the likeliest explanation.

Elbee of all the people I can think of that can make the appropriate mods to make her safe and true it is you. I am just saying don't let that one flaw necessarily persuade you from the model. My humble advice would be to take the intel in, make the changes needed and build that gorgeous model I know you can. Who knows if or when X-Fly will ever come out with a new version/upgrade. And the plain fact of the matter is, she is a beauty and an ideal canvas for your expertise.

[Mattman2023]

Thanks Doug,,, wow,,,, very sorry
Pictures,,,Thanks!!

Brownout seems like a reasonable reason but is that what happened.
I would think with a brownout it would effect both servos.....
To bad there's no telemetry......
Looking at your pictures it's obvious that the right servo stopped halve way.
I wonder did that right wing jam somehow causing the servo to stop due to a current overload.
I've had gear do that many times......
I don't know maybe a flap didn't come up all the way or the wing jammed for some other reason.....


That left wing is missing the flap.. Crash damage?
And that right wing the flap is not neutral it's down.
Looks like down enough to jam the wing........

[Evan D]

My view is that I have a preconceived notion of brown out, receiver not getting the minimum voltage to receive and process the signal, which is not how it's used in this case. I could see that the power was loaded to the point one high draw item, wing servo could draw down power where it stopped working. I know many retract servos have over current protection and the wing sweep servo is nothing more than a repurposed retract.

Thank you for the investigative reporting Doug, sorry it happened...

[nuts-n-volts]

Doug, Thanks for the detailed post crash report. The pictures help greatly. I think I'm also leaning to your second as the actual cause with yours. While I tend to think, like Kallend, that they should have failed together, it's entirely possible, because of possible differing drag on the units and the associated amp draws, that one side (left) failed first. I haven't gotten to mine yet, but I assume these units work the same way a retract does, in that, they simply stop when over-loaded?

[Dougcarr73]

First sorry this happened to you.......
Talking about the ball arm,,, your fail doesn't sound like the arm broke if it had the wing should have just been pushed all the way aft.
Brownout,,, possible..... would think it would effect both.....
Post crash checking your B1 did you try seeing if the sweep servos were working,,, with a servo tester?

Post crash, I tested each individual servo with a servo tester and they both operated flawlessly. The left servo had so much power that it began to straighten out the bend in the metal bar when it tried to full extend. The right servo moved freely and with hand pressure it moved what was left of the plane... very strong

1. Binding; however there was nothing to cause it to bind and flaps were retracted for the wing sweep.
2. Brown out from near full power and wing sweep simultaneously; this has happened with the landing gear on other aircraft where one gear would stay down, but once you pull the power back and cycle, all the gear would go up.
3. Right wing sweep servo arm severed in flight; I'm not sure how this could have happened, but it makes sense that the right wing servo arm severed causing the right wing to close faster than the left.

I'm leaning toward number two s the reason and number three as a close second. Post crash analysis showed one army fully retracted and the other halfway, which would indicate a loss of power somewhere. Plus, the servos operate individually just like landing gear servos. On my older FW F-18 I had the problem of one gear staying down at full power. I haven't had that problem in years.

[Elbee]

I sold mine and made sure he knew to reinforce that arm. Maybe down the road I might pick up another one, especially if they update to better hardware.

Aros, I know, right? Wanted this one to be a "special" model. even had a livery picked out.

I watched our KsANG B-1s for years buzzing around East Wichita. Even had the opportunity to log a couple hours in the Sim.

I was simply waiting for some more motivation and open time to do the B-One up right. Now I'm just a bit tainted.

Another day, maybe, I'll be watching.

Best, LB

[Aros]

I sold mine and made sure he knew to reinforce that arm. Maybe down the road I might pick up another one, especially if they update to better hardware.

[Mattman2023]

I crashed, or shall I say my B1 malfunctioned. I’ve had about 6 good flights over the past month. During wing sweep today only the right wing retracted and the left stopped retracting midway. A spinning dive ensued to obliteration.

Any suggestions on what it could be?

- The post flight analysis ruled out binding.
- The other thought is it was a brown out. I was at about 90% throttle and the amp draw may have caused it to fail.

Has anyone added a bec to avoid this, or is it even needed? It seems like one is needed after this flight. XFLY, or banana hobby should have accounted for this in the design.

First sorry this happened to you.......
Talking about the ball arm,,, your fail doesn't sound like the arm broke if it had the wing should have just been pushed all the way aft.
Brownout,,, possible..... would think it would effect both.....
Post crash checking your B1 did you try seeing if the sweep servos were working,,, with a servo tester?

[kallend]

I would recommend that everyone with one of these B-1Bs should reinforce the sweep control arms on the wings, given the reports we've seen of these breaking.

I'm not sure I really like the thin aluminum reinforcement BH is selling, unless you bond it to the wing/arm with epoxy in addition to using those screws into the thin plastic.

I reinforced mine with glass cloth epoxied to the part.

[Dougcarr73]

Surely a brown-out would have affected both wings equally.

Had you reinforced the "arms" on the wing where the sweep mechanism pushrods are attached? There have been a number of reports of these breaking, which if it happened on the left wing would account for the wing's failure to sweep.

The European distributor sent out reinforcements for free, but BH has said nothing but will SELL you the reinforcement of you want them.

I did not reinforce the arms. One was bent and the other severed, which I assumed was from the crash, but that could be the reason. With that new info, I'll double check which side when I get back to the house this evening.

[kallend]

I crashed, or shall I say my B1 malfunctioned. I’ve had about 6 good flights over the past month. During wing sweep today only the right wing retracted and the left stopped retracting midway. A spinning dive ensued to obliteration.

Any suggestions on what it could be?

- The post flight analysis ruled out binding.
- The other thought is it was a brown out. I was at about 90% throttle and the amp draw may have caused it to fail.

Has anyone added a bec to avoid this, or is it even needed? It seems like one is needed after this flight. XFLY, or banana hobby should have accounted for this in the design.

Additional: See post 232 and 244 in this thread, and https://www.rcgroups.com/forums/show...postcount=1778

[kallend]

I crashed, or shall I say my B1 malfunctioned. I’ve had about 6 good flights over the past month. During wing sweep today only the right wing retracted and the left stopped retracting midway. A spinning dive ensued to obliteration.

Any suggestions on what it could be?

- The post flight analysis ruled out binding.
- The other thought is it was a brown out. I was at about 90% throttle and the amp draw may have caused it to fail.

Has anyone added a bec to avoid this, or is it even needed? It seems like one is needed after this flight. XFLY, or banana hobby should have accounted for this in the design.

Surely a brown-out would have affected both wings equally.

Had you reinforced the "arms" on the wing where the sweep mechanism pushrods are attached? There have been a number of reports of these breaking, which if it happened on the left wing would account for the wing's failure to sweep.

The European distributor sent out reinforcements for free, but BH has said nothing but will SELL you the reinforcement of you want them.

[Dougcarr73]

I crashed, or shall I say my B1 malfunctioned. I’ve had about 6 good flights over the past month. During wing sweep today only the right wing retracted and the left stopped retracting midway. A spinning dive ensued to obliteration.

Any suggestions on what it could be?

- The post flight analysis ruled out binding.
- The other thought is it was a brown out. I was at about 90% throttle and the amp draw may have caused it to fail.

Has anyone added a bec to avoid this, or is it even needed? It seems like one is needed after this flight. XFLY, or banana hobby should have accounted for this in the design.

[kallend]

Here's a video of my friend Gianni doing the maiden flight of his Xfly B-1

Very nice.

Needs afterburners.

https://www.youtube.com/watch?v=htWoFn1n58o

And the real thing:

https://youtu.be/Sn90w57ctKg?t=174