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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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 Posted: Mon Apr 06, 2015 6:00 am Post subject: Engine start button |
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Hi Guys
I'm thinking of using this 'engine start' button (only the button, from the panel shown) on the RV9 - it looks more than a simple 'push to close' wiring, am I still good to go with this item
Best regards
John
[quote][b]
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peter(at)sportingaero.com
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| Posted: Mon Apr 06, 2015 11:04 am Post subject: Engine start button |
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John,
I've been using one of these for the last 3 years, with the illuminated bit used as a starter warning light.
http://www.carbuildersolutions.com/uk/push-button-engine-start-switch
Although I think I got it cheaper from somewhere else. The one you chose looked a bit complex.
See also this.
Regards, Peter
On 06/04/2015 14:58, John Tipton wrote:
[quote] Hi Guys
I'm thinking of using this 'engine start' button (only the button, from the panel shown) on the RV9 - it looks more than a simple 'push to close' wiring, am I still good to go with this item
Best regards
John
[b]
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nuckolls.bob(at)aeroelect
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| Posted: Mon Apr 06, 2015 11:33 am Post subject: Engine start button |
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At 08:58 2015-04-06, you wrote:
Hi Guys
I'm thinking of using this 'engine start' button (only the button,
from the panel shown) on the RV9 - it looks more than a simple 'push
to close' wiring, am I still good to go with this item
Best regards
John'
It appears that this kit comes with a relay
for boosting the current handling ability
of the rather Lilliputian switch. The same
relay would be recommended for the switch
that Peter has cited. Neither device would
stand up robustly to switching loads imposed
by intermittent duty starter contactors.
Bob . . .
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peter(at)sportingaero.com
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| Posted: Mon Apr 06, 2015 11:52 am Post subject: Engine start button |
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Sorry not to make that clear - this switch is used to engage a regular starter relay.
P
On 06/04/2015 20:02, Peter Pengilly wrote:
[quote] John,
I've been using one of these for the last 3 years, with the illuminated bit used as a starter warning light.
http://www.carbuildersolutions.com/uk/push-button-engine-start-switch
Although I think I got it cheaper from somewhere else. The one you chose looked a bit complex.
See also this.
Regards, Peter
On 06/04/2015 14:58, John Tipton wrote:
| Quote: | Hi Guys
I'm thinking of using this 'engine start' button (only the button, from the panel shown) on the RV9 - it looks more than a simple 'push to close' wiring, am I still good to go with this item
Best regards
John
|
[b]
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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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| Posted: Mon Apr 06, 2015 11:09 pm Post subject: Engine start button |
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But why wouldn't it, if the light weight (Lilliputian) switch has it's own relay, should that not be enough for the circuit (Z11 etc: 20awg 7amps) to a starter contactor, as Peter cited he has used similar for a few years now.
John
Sent from my iPad
----x--O--x----
| Quote: | On 6 Apr 2015, at 08:32 pm, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
At 08:58 2015-04-06, you wrote:
Hi Guys
I'm thinking of using this 'engine start' button (only the button, from the panel shown) on the RV9 - it looks more than a simple 'push to close' wiring, am I still good to go with this item
Best regards
John'
It appears that this kit comes with a relay
for boosting the current handling ability
of the rather Lilliputian switch. The same
relay would be recommended for the switch
that Peter has cited. Neither device would
stand up robustly to switching loads imposed
by intermittent duty starter contactors.
Bob . . .
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user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
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| Posted: Tue Apr 07, 2015 5:15 am Post subject: Re: Engine start button |
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My RV-12 starter contactor-coil circuit is protected by a 2 amp fuse.
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nuckolls.bob(at)aeroelect
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| Posted: Tue Apr 07, 2015 5:28 am Post subject: Engine start button |
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At 02:07 2015-04-07, you wrote:
--> AeroElectric-List message posted by: John Tipton <jmtipton(at)btopenworld.com>
But why wouldn't it, if the light weight (Lilliputian) switch has it's own relay, should that not be enough for the circuit (Z11 etc: 20awg 7amps) to a starter contactor, as Peter cited he has used similar for a few years now.
The kit cited had a plastic cube relay with fast-ons.
I assumed it was intended to be used to buffer the
starter contactor/solenoid current thus limiting
the push-button's stresses to the 150 mA or so
drawn by the relay coil.
Peter spoke to a 'regular starter relay' which does
not paint a lucid image in my peanut butter . . .but
let's assume it's a generic intermittent-duty contactor
with a coil current on the order of 5A and capable of
significant inductive reaction. If such a contactor
is fitted with coil suppression, then it is quite possible
that a switch of this genre' would stand up to the
task for hundreds of cycles, i.e. years in an airplane
flow on average 100 hours a year.
Without having specific ratings for Peter's switch,
I have to go with the 'feel' conjured up by the
image which suggests a switch probably rated at
1A or so for tens of thousands of cycles . . .
and indeed capable of the service that Peter
cited.
[img]cid:.0[/img]
The other switch has a curious back side
with screw-clamps. This suggests more robustness
than the switch above . . . but again . . .
no data . . . no foundation for prediction.
[img]cid:.1[/img]
Without having one of those kits in hand, we
don't know how the relay is to be used. I would
not expect it to be required in the ignition system
but who knows?
So understand that my assertions arose more
from rules of thumb and gut feelings with roots
in my design-for-lifetime-of-airplane in a
TC world than from any assessment of hard data.
Either switch may well produce satisfactory
service as control of a coil-suppressed starter
contactor.
Bob . . .
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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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| Posted: Tue Apr 07, 2015 5:41 am Post subject: Engine start button |
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Bob
Thank you
John
Sent from my iPad
----x--O--x----
[quote] On 7 Apr 2015, at 02:26 pm, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
At 02:07 2015-04-07, you wrote:
But why wouldn't it, if the light weight (Lilliputian) switch has it's own relay, should that not be enough for the circuit (Z11 etc: 20awg 7amps) to a starter contactor, as Peter cited he has used similar for a few years now
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dennis.glaeser(at)gm.com
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| Posted: Tue Apr 07, 2015 7:02 am Post subject: Engine start button |
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I have a large red “Engine Start” button from a sports car (Mazda I think, but not sure anymore). The switch itself is a low load device, so it activates a Bosch (cube) relay which actually powers the solenoid on the starter. My engine is a Subaru, so all the automotive components are right at home!
This system has been operating flawlessly for 7 years and 400 hours now.
I’ve attached a picture (during construction), not sure if it will come through…
Dennis Glaeser
RV7A
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peter(at)sportingaero.com
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| Posted: Tue Apr 07, 2015 1:43 pm Post subject: Engine start button |
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