Flap motor - current draw

[kai]

Hi,

I?m just planning a complete rewiring and modification of the electrical and avionics system of our used RV-9A.
For that I have to do a load analysis for the electrical system.
Can anyone tell me the current draw of the flap motor?

Thanks!

 

[Rick_A]

Offhand, I can't tell you the current draw but I use a 7.5A breaker for my flaps and it's worked fine for 3+ years. I'm sure I researched the correct breaker before I installed it.

 

[Wayne Gillispie]

I think 3.5 Amps is what I came up with during a test with simulated air load. I have a 5A ATO fuse on it with 22.4 hours problem free.

 

[FlyingArcher]

You can search the forums to find some interesting threads about flap motor current draw.

This one was quite interesting and might help you.

Happy New Year

 

[rjcthree]

Planned for 7.5a

While 5a seems to work for most, I also simulated, and would get 3.5-3.8a running loaded (depending on temp) but would occasionally see 4.5a on startup loaded (one down position to next downward position). I went 7.5a and wired accordingly. I'm using the direct acting switch supplied with the kit.

Other threads noted have discussions re: issues at 5a long-term.

Remember, a CB is a shunt(thermally triggered), a shunt is essentially a resistor in series with your circuit. If you can size up, voltage drop across the CB at the same amperage is nominally less. If it matters, I dunno, but good practice and all of that.

Rick 90432

 

[kai]

Thanks to all for the infos, that helps!

I think 5A is too small. Normally you should limit a CB at 80%. So that you should calculate with 4A max. When the amps go to 4.5 during motor start and then down to 3.5 to 3.8 it is a little bit too small. I will take a 7.5A CB and a AWG16 wire. That should be ok.
We have enough power in our RV. We will remove the 35A Alternator and install a 60A.

Happy new year from germany,

Kai.

 

[islandmonkey]

Thanks to all for the infos, that helps!

I think 5A is too small. Normally you should limit a CB at 80%. So that you should calculate with 4A max. When the amps go to 4.5 during motor start and then down to 3.5 to 3.8 it is a little bit too small. I will take a 7.5A CB and a AWG16 wire. That should be ok.
We have enough power in our RV. We will remove the 35A Alternator and install a 60A.

Happy new year from germany,

Kai.

Welcome to VAF Kai. I have just noticed this is your second post on the Forum.

Frohes Neues Jahr aus der Schweiz!

 

[AltonD]

Several threads out there where the 5 amp breakers occasionally tripped. Replaced with the 7.5 amp and problem solved. 180 hours and no issues with the 7.5 amp breaker.

 

[kai]

@Anthony

Thank you very much. Yes, I?m new to the forum, we just bought a used RV-9A in the US and we will start to modify it. I?m sure i will post a lot more...

Und dir auch ein fr?hliches neues Jahr!