Today's Message Index:
----------------------
1. 04:16 AM - Re: Can the 912ULS be hand started? (Mike M)
2. 04:56 AM - Re: Re: Can the 912ULS be hand started? (rparigor@suffolk.lib.ny.us)
3. 11:05 AM - Re: Re: Can the 912ULS be hand started? (Craig Payne)
4. 04:42 PM - Re: Can the 912ULS be hand started? (FLYaDIVE)
5. 04:55 PM - Re: Can the 912ULS be hand started? (Gale Derosier)
Message 1
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| Subject: | Re: Can the 912ULS be hand started? |
Thanks for the good info on hand starting issues for the 912S...high compression,
potential kick back, and thin prop blades and achieving sufficient RPM to for
the ignition system to spark.
I can foresee a situation where a battery dies or starter system fails at a remote
landing site, which would result in a long walk out of 10- 20 miles. In this
case I would be like to have the option to attempt a hand start. It would
be good to know that it is at least possible to hand start the 912S based on the
knowledge that someone out there in the ROTAX world has successfully done it.
--------
Mike Marker
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=426417#426417
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| Subject: | Re: Can the 912ULS be hand started? |
Hi Group
FWIW I took a bike ride by the model flying field a few weeks ago and
took a look at a 3 cell 1300mA Lithium Polymer pack.
It was a Thunder something or other (Thunder Power?). Anyway it was about
a third the size of a pack of cigarettes and said it could output
80C!
The guy said folks have gotten stuck with their cars and used them to get
going again.
If you are not charging and discharging a battery in flight I think the
chance of a battery getting all hot and bothered are pretty remote.
That's not the case after you just started your plane with it though,
so careful monitoring for a few minutes is prudent.
I believe the self discharge rate is not too bad on LiPos. We know you
are going to get a substantial voltage drop, so it would be worth someone
considering this option to try a 3 cell pack, perhaps even a 4 cell
pack.
I have a NiMh total loss pack for my 914. It can a fuel pump, in an
emergency can probably get me started too:
http://www.europaowners.org/main.php?g2_itemId=87439
Ron Parigoris
Message 3
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| Subject: | Re: Can the 912ULS be hand started? |
There are now lithium ion packs that are smaller than a paperback that can
start your car. Here is a link to a review of three of them:
http://www.cnet.com/news/pocket-sized-jump-starters/
-- Craig
On Thu, Jul 10, 2014 at 4:56 AM, <rparigor@suffolk.lib.ny.us> wrote:
> Hi Group
>
> FWIW I took a bike ride by the model flying field a few weeks ago and took
> a look at a 3 cell 1300mA Lithium Polymer pack.
>
> It was a Thunder something or other (Thunder Power?). Anyway it was about
> a third the size of a pack of cigarettes and said it could output 80C!
>
> The guy said folks have gotten stuck with their cars and used them to get
> going again.
>
> If you are not charging and discharging a battery in flight I think the
> chance of a battery getting all hot and bothered are pretty remote. That's
> not the case after you just started your plane with it though, so careful
> monitoring for a few minutes is prudent.
>
> I believe the self discharge rate is not too bad on LiPos. We know you are
> going to get a substantial voltage drop, so it would be worth someone
> considering this option to try a 3 cell pack, perhaps even a 4 cell pack.
>
> I have a NiMh total loss pack for my 914. It can a fuel pump, in an
> emergency can probably get me started too:
>
> http://www.europaowners.org/main.php?g2_itemId=87439
>
> Ron Parigoris
>
> *
>
>
> *
>
>
Message 4
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| Subject: | Re: Can the 912ULS be hand started? |
Good question Mike!
Let's see...
Which prop do you have?
Two blade or Three blade?
With a three blade your chances of getting hit with the following blade are
66.6% higher than with a two blade.
The gearbox is a reduction in RPM from the engine to the prop. So,
reversing the gear reduction the engine should turn Faster than the prop
increasing your chances of starting... As long as you have the strength to
swing the prop.
What kind of ignition system do you have? Things like vacuum advancing
decrease your chances of hand propping because a higher Engine RPM is
required for starting.
If you have a RANS Pusher, I would think you would be in deep yogurt!
If a tractor, yea, you do stand a better chance. Not great, but better.
Anyone out ther with success in this area. Anyone that is still in one
piece?
Barry
On Wednesday, July 9, 2014, Mike M <mjwings@msn.com> wrote:
> <javascript:;>>
>
> I recently landed at a remote dry lake in my RV-4 with a Lycoming engine.
> When I attempted to start, my starter would not engage. Luckily I was
> able to hand prop the engine to get it started. If a similar situation
> occurred with my ROTAX 912 ULS powered RANS, would I be able to hand prop
> to get the engine started?
>
> --------
> Mike Marker
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=426401#426401
>
>
--
Sent from Gmail Mobile
Message 5
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| Subject: | Re: Can the 912ULS be hand started? |
I think typically you have to have the engine turning at 300 rpm or greater
for the engine to even start. That's why when you try and start on a dead
battery or a low battery may result in no start.
On Jul 10, 2014 6:46 PM, "FLYaDIVE" <flyadive@gmail.com> wrote:
> Good question Mike!
>
> Let's see...
> Which prop do you have?
> Two blade or Three blade?
> With a three blade your chances of getting hit with the following blade
> are 66.6% higher than with a two blade.
> The gearbox is a reduction in RPM from the engine to the prop. So,
> reversing the gear reduction the engine should turn Faster than the prop
> increasing your chances of starting... As long as you have the strength to
> swing the prop.
> What kind of ignition system do you have? Things like vacuum advancing
> decrease your chances of hand propping because a higher Engine RPM is
> required for starting.
> If you have a RANS Pusher, I would think you would be in deep yogurt!
> If a tractor, yea, you do stand a better chance. Not great, but better.
>
> Anyone out ther with success in this area. Anyone that is still in one
> piece?
>
> Barry
>
>
> On Wednesday, July 9, 2014, Mike M <mjwings@msn.com> wrote:
>
>>
>> I recently landed at a remote dry lake in my RV-4 with a Lycoming engine.
>> When I attempted to start, my starter would not engage. Luckily I was
>> able to hand prop the engine to get it started. If a similar situation
>> occurred with my ROTAX 912 ULS powered RANS, would I be able to hand prop
>> to get the engine started?
>>
>> --------
>> Mike Marker
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=426401#426401
>>
>>
>>
>>
>>
>>
>>
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>> ==========
>> le, List Admin.
>> ="_blank">http://www.matronics.com/contribution
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>>
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>>
>>
>
> --
> Sent from Gmail Mobile
>
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>
>
> *
>
>
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