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E-flite P-47 Thunderbolt Crash Today .. bad. Repair or parts?

#22
If you use a better servo than the Eflite one, like an HT 45 or HT 65 with ball bearing shaft and karbonite gears you can have fast response and light weight with lower current draw.
I had not considered brown out, another reason to bench test all the components together.
What would be the difference between the 45 and 65?
 

FDS

Elite member
#23
Look at the spec sheets, 45 is smaller. You want to buy a slightly better version of what was in it to begin with, not something twice the size. I have no idea what the original servos are like in your plane. Those were examples of faster acting, more durable servos without the current draw of a fully digital metal gear 9g.
 

makattack

Winter is coming
Moderator
Mentor
#24
Here's a RC Groups chat about brownouts and servos overloading BEC.
https://www.rcgroups.com/forums/sho...-and-Amperage-Draw-Overdrawn-Current-Brownout

You have a SAFE receiver right? Unless you turn off AS3X, all those servos can be commanded by the flight controller to be running to stabilize the plane. Aileron (2), elevator (1), rudder (1). Add in flaps in an extended position, and you could have (assuming 2 flaps servos) 6 servos drawing from your poor BEC all at once.

They of course link to a flitetest video that discusses all this (good discussion on digital servos as well):
 
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#25
Yes it has SAFE and it was on. My flaps weren't deployed, I don't like taking off with them but I believe I might have hit the gear retract switch which are probably a heavy draw more than a regular servo.... That might have been when I lost control. I can't remember for certain but I had just taken off and my usual action is to retract the landing gear.

Damn this is all stuff I didn't know, I wish it hadn't been such a costly lesson lol.

Jim
 
#26
Well I have learnt something from your crash. Watch your Bec amps maybe not the reason in this case but a good thing to look out for either way
 
#27
Wow that video is excellent at explaining brown out... That's scary I had no idea. I'll have to look at the draw for the metal vs the original ones and see what the difference is. This has been really informative than you everyone.

Jim
 

Brett_N

Well-known member
#28
DO NOT DO MAJOR REPAIRS WITH CA.

I REPEAT

DO NOT USE CA!!!


It is too brittle for long crack fixes like your fuze. But, that is a totally fixable airframe.

BBQ Skewers, packing tape, and SHOE GOO or original (yellow) Gorilla Glue.

If you use GG - wet both sides of the joint, spread in the GG, press togethor, and cover the OUTSIDE with tape. This keeps the foaming action under control.

My jug looked even worst than that after losing a servo

Check your servo's - I'll betcha you didn't lose signal, rather one of the aileron servo's crapped out.
 

Hai-Lee

Old and Bold RC PILOT
#30
Ok I've used GG before on my apprentice.

My servos are fine I tested everything after the crash. That was their first flight.

Jim
If the servos checked out and still are OK and the Rx passed its range check you are really only left with a couple of possible issues, (if you exclude some random intermittency), and they are either there was a massive interference, (DoS), event across the entire radio band/channel your radio was using, the ESC/BEC overheated and shutdown the Rx voltage supply, or there was an antenna induced LoS event.

Have fun!