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Subject: Re: [LML] Re: Gear Relays are not working
From: Bryan Wullner <vonjet@gmail.com>
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The Legacy plans show a 35 amp breaker instead of a 50amp.On a side note: I
fried the casing off a 22gauge wire about 13" long and its amazing how much
smoke it created. I would not have wanted to see that in flight.

Bryan

On Tue, May 26, 2009 at 1:22 PM, John Cooper <snopercod@citcom.net> wrote:

> Good comments so far by several responders. My personal additions:
>
> 1. A 50A circuit breaker specified in the plans will in no way protect your
> hydraulic pump from burning up should the rotor lock up, neither will it
> protect your #10 pump wiring from burning up in the event of a fault. This
> error by the factory dates back to the very first kit in 1986(?), and AFAIK,
> Lancair has never corrected it. The Oildyne pump draws maybe ~15 Amps when
> the gear are in motion, which spikes up to ~30 Amps just before the pressure
> switch stops the pump. A 50 Amp circuit breaker will take roughly 3 minutes
> to trip with 100 Amps flowing through it. Think about that.
>
> If you insist on using a circuit breaker, 30A would be better, but still
> won't protect you from smoke in the cockpit should your pump lock up. (A 30A
> or 40A Maxi-Fuse offers better protection.)
>
> 2. Yes, connect the control power circuit breaker downstream of the main
> circuit breaker for the hydraulic pump. That way, the relays can't stay
> energized when the main CB (or fuse) is open.
>
> 3.  I recommend high-reliability 75A Bosch Relays for the hydraulic pump,
> not the crap that the factory provided. (see details and part numbers posted
> here sometime during the last year).
>
> 4. Yes, use the back-to-back diodes to feed your "gear transition light".
> (See the schematic I posted here a few months ago). I used a red/green LED
> which shows red when the hydraulic pump is running in either direction, and
> green when the nose gear door is closed.
>
> 5. Lance was a true genius when it came to aerodynamics, aesthetics, and
> business, but he didn't know diddly about electricity.
>
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>

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The Legacy plans show a 35 amp breaker instead of a 50amp.<div>On a side no=
te: I fried the casing off a 22gauge wire about 13&quot; long and its amazi=
ng how much smoke it created. I would not have wanted to see that in flight=
.=A0</div>
<div><br></div><div>Bryan<br><br><div class=3D"gmail_quote">On Tue, May 26,=
 2009 at 1:22 PM, John Cooper <span dir=3D"ltr">&lt;<a href=3D"mailto:snope=
rcod@citcom.net">snopercod@citcom.net</a>&gt;</span> wrote:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex;">
Good comments so far by several responders. My personal additions:<br>
<br>
1. A 50A circuit breaker specified in the plans will in no way protect your=
 hydraulic pump from burning up should the rotor lock up, neither will it p=
rotect your #10 pump wiring from burning up in the event of a fault. This e=
rror by the factory dates back to the very first kit in 1986(?), and AFAIK,=
 Lancair has never corrected it. The Oildyne pump draws maybe ~15 Amps when=
 the gear are in motion, which spikes up to ~30 Amps just before the pressu=
re switch stops the pump. A 50 Amp circuit breaker will take roughly 3 minu=
tes to trip with 100 Amps flowing through it. Think about that.<br>

<br>
If you insist on using a circuit breaker, 30A would be better, but still wo=
n&#39;t protect you from smoke in the cockpit should your pump lock up. (A =
30A or 40A Maxi-Fuse offers better protection.)<br>
<br>
2. Yes, connect the control power circuit breaker downstream of the main ci=
rcuit breaker for the hydraulic pump. That way, the relays can&#39;t stay e=
nergized when the main CB (or fuse) is open.<br>
<br>
3. =A0I recommend high-reliability 75A Bosch Relays for the hydraulic pump,=
 not the crap that the factory provided. (see details and part numbers post=
ed here sometime during the last year).<br>
<br>
4. Yes, use the back-to-back diodes to feed your &quot;gear transition ligh=
t&quot;. (See the schematic I posted here a few months ago). I used a red/g=
reen LED which shows red when the hydraulic pump is running in either direc=
tion, and green when the nose gear door is closed.<br>

<br>
5. Lance was a true genius when it came to aerodynamics, aesthetics, and bu=
siness, but he didn&#39;t know diddly about electricity.<br><font color=3D"=
#888888">
<br>
--<br>
For archives and unsub <a href=3D"http://mail.lancaironline.net:81/lists/lm=
l/List.html" target=3D"_blank">http://mail.lancaironline.net:81/lists/lml/L=
ist.html</a><br>
</font></blockquote></div><br></div>

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