Today's Message Index:
----------------------
1. 03:34 AM - Re: IVO Prop Motor Current Limiter and Electronic CB (tomcostanza)
2. 04:07 AM - Re: Electric Boost Pump & Primer Switching (user9253)
3. 06:25 AM - Re: Re: IVO Prop Motor Current Limiter and Electronic CB (Robert L. Nuckolls, III)
4. 06:27 AM - Re: Re: IVO Prop Motor Current Limiter and Electron ic CB (Robert L. Nuckolls, III)
5. 12:47 PM - Busbar voltage from SD-8 (Peter Pengilly)
6. 03:48 PM - Re: Re: IVO Prop Motor Current Limiter and Electr on ic CB (n801bh@netzero.com)
7. 05:39 PM - Re: Busbar voltage from SD-8 (Robert L. Nuckolls, III)
8. 05:39 PM - Re: Re: IVO Prop Motor Current Limiter and Electr on ic CB (Robert L. Nuckolls, III)
9. 07:57 PM - Re: Re: IVO Prop Motor Current Limiter and Electr on ic CB (Bill Schertz)
10. 08:41 PM - Re: IVO Prop Motor Current Limiter and Electronic CB (Robert L. Nuckolls, III)
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| Subject: | Re: IVO Prop Motor Current Limiter and Electronic |
CB
>Thomas Edison is reported to have said after 8000 failures making a
>storage battery.
>"Well, at least we know 8000 things that don't work."
Charles Kettering's crew did over 10000 experiments searching
for the economical and effective anti-knock additive for
gasoline.
>So, IMHO, even a "flop" can be a success if it shows us what not to do.
Exactly. There's a new restaurant endeavor spinning up
in a small town near Medicine Lodge. The guy doing it
is a craftsman and probably a pretty good cook. His
efforts so far in getting his facility ready are
impressive (and expensive). But he's never run a
restaurant before nor built an efficient commercial
kitchen. I'm arranging for my son (14+ years in
a host of business and facilities) to meet him. Not
so much to tell him WHAT to do but to assist in
steering him around things that are proven no-nos.
A meeting of experienced minds with long histories
of both successes and failures is the shortest path
to new recipes for success. Everyone from the architect
to the folks who come to collect the trash have an
important role to play.
Bob . . .
Message 4
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| Subject: | Re: RE: IVO Prop Motor Current Limiter and Electron |
ic CB
At 09:11 PM 5/9/2010, you wrote:
>Thanks guys for experimenting in this area.... I have been through 1
>Ivo motor so far and the current one is showing its age now... I am
>pretty anal about taking care not to drive the motor to its stall
>limit by using my ammeter to show increased amp draw, but this is
>kinda hard to do with my 80 amp alt keeping up with the load and
>masking the higher draw when stalled, or at least approaching it.
>The 'extra' noise from the V-8 up front doesn't help either. <G>.
>
>Tailwinds all..............
Interesting! I wonder if there are others here
on the List who are experiencing less than
stellar motor life on IVO.
When the motor fails, what's gone south?
Brushes, bearings, wires, ?
Bob . . .
Message 5
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| Subject: | Busbar voltage from SD-8 |
Hi,
I wonder if I could pick your collective brains? I've just started
flying a One Design that has only an SD-8 to generate power, with a
PC-680 battery. The bus bar voltage is around 15.1 volts (verified on 2
independent instruments). I realise that this is at the top end of the
desirable range, but is it too high? There are very few electrical
services that I can switch on to provide a load to the system. I believe
there is an adjuster screw on the voltage regulator - but that takes a
couples hours of panels unscrewing to access.
So my question is 15.1volts too high for a steady state busbar voltage?
Do I need to do something about it right away or could it wait for 5 hours?
Regards, Peter
Message 6
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| Subject: | Re: RE: IVO Prop Motor Current Limiter and Electr |
on ic CB
My wires are fine... I usually upsize one gauge or so to be safe on all
my circuits. Brush wear was high in the beginning till the commutator g
ot coated with brush material.... First set of brushes lasted about 20 h
ours, second set went 80 or so. It is stabilized at around 150 hours for
a set now. The motor just failed at the 50 hour mark, I sent it back an
d Ron @ Ivo exchanged it for a new one, no charge, so I am guessing they
had a bad batch. I will contact them this week when I sent this one bac
k but I am pretty sure this next one will cost me some AMU's. <G> I wil
l remind them of the positive article Kitplanes mag did on my plane with
hopes they 'might' cut me some slack though . http://www.kitplanes.com
/issues/26_12/exploring/9026-1.phtml
About 18 minutes into my video is a shot of the brushes
=2Ehttp://video.google.com/videoplay?docid=-7272451917550730841&hl=e
n#
I am curious to hear if others have had motor failures though.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
---------- Original Message ----------
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: RE: IVO Prop Motor Current Limiter and
Electron ic CB
olls.bob@aeroelectric.com>
At 09:11 PM 5/9/2010, you wrote:
>Thanks guys for experimenting in this area.... I have been through 1
>Ivo motor so far and the current one is showing its age now... I am
>pretty anal about taking care not to drive the motor to its stall
>limit by using my ammeter to show increased amp draw, but this is
>kinda hard to do with my 80 amp alt keeping up with the load and
>masking the higher draw when stalled, or at least approaching it.
>The 'extra' noise from the V-8 up front doesn't help either. <G>.
>
>Tailwinds all..............
Interesting! I wonder if there are others here
on the List who are experiencing less than
stellar motor life on IVO.
When the motor fails, what's gone south?
Brushes, bearings, wires, ?
Bob . . .
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Message 7
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| Subject: | Re: Busbar voltage from SD-8 |
At 02:31 PM 5/10/2010, you wrote:
><peter@sportingaero.com>
>
>Hi,
>
>I wonder if I could pick your collective brains? I've just started
>flying a One Design that has only an SD-8 to generate power, with a
>PC-680 battery. The bus bar voltage is around 15.1 volts (verified
>on 2 independent instruments). I realise that this is at the top end
>of the desirable range, but is it too high? There are very few
>electrical services that I can switch on to provide a load to the
>system. I believe there is an adjuster screw on the voltage
>regulator - but that takes a couples hours of panels unscrewing to access.
>
>So my question is 15.1volts too high for a steady state busbar
>voltage? Do I need to do something about it right away or could it
>wait for 5 hours?
It's not a recipe for fast-destruction of the battery . . .
but we'd like to see it lower. 14.6 volts is a good target.
I'd make the adjustment.
Bob . . .
Message 8
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| Subject: | Re: RE: IVO Prop Motor Current Limiter and Electr |
on ic CB
At 05:38 PM 5/10/2010, you wrote:
>My wires are fine... I usually upsize one gauge or so to be safe on
>all my circuits.
I was wondering about wires inside the motor . . . i.e. windings
on the armature . . .
> Brush wear was high in the beginning till the commutator got
> coated with brush material.... First set of brushes lasted about 20
> hours, second set went 80 or so. It is stabilized at around 150
> hours for a set now. The motor just failed at the 50 hour mark, I
> sent it back and Ron @ Ivo exchanged it for a new one, no charge,
> so I am guessing they had a bad batch.
Hmmmm . . . I presume the times quoted are FLIGHT times. I
would guess that this motor runs less than 5% of flight
time. That doesn't speak well of brush wear rates.
Event the smallest brushed PM motors we used to build
at E-M had brush lives in the hundreds of hours which
would translate to thousands of flight hours.
The next time you talk with Ron, suggest to him that I'm willing
to offer what ever might be useful from my experience-base
in this technology to improve on his product's service
life.
Bob . . .
Message 9
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| Subject: | Re: RE: IVO Prop Motor Current Limiter and Electr |
on ic CB
I may be mistaken, but I thought the Ivo prop had brushes that were rubbing
all the time the prop was turning -- I.e. they transfer power from the
stationary part of the engine to the rotating prop, which has the motor
mounted on it, (which then rotates with the prop).
Bill Schertz
KIS Cruiser #4045
N343BS
Phase I testing
--------------------------------------------------
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Monday, May 10, 2010 7:35 PM
Subject: Re: AeroElectric-List: RE: IVO Prop Motor Current Limiter and
Electr on ic CB
> Hmmmm . . . I presume the times quoted are FLIGHT times. I
> would guess that this motor runs less than 5% of flight
> time. That doesn't speak well of brush wear rates.
>
> Event the smallest brushed PM motors we used to build
> at E-M had brush lives in the hundreds of hours which
> would translate to thousands of flight hours.
>
> The next time you talk with Ron, suggest to him that I'm willing
> to offer what ever might be useful from my experience-base
> in this technology to improve on his product's service
> life.
>
> Bob . . .
Message 10
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| Subject: | re: IVO Prop Motor Current Limiter and Electronic CB |
At 09:05 PM 5/10/2010, you wrote:
>
>I may be mistaken, but I thought the Ivo prop had brushes that were
>rubbing all the time the prop was turning -- I.e. they transfer
>power from the stationary part of the engine to the rotating prop,
>which has the motor mounted on it, (which then rotates with the prop).
Good questions. No doubt there are two sets of brushes.
One that conducts power from the stationary airframe and
rotating pitch motor assembly, a second set of brushes
run on the commutator within the permanent magnet motor.
So I need to expand my own question to ask which of
the two brush sets is demonstrating a service-life
issue.
Bob . . .
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