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1. 09:58 AM - Re: static rpm (ron hansen)
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Best of luck with everything.
Ron
On Wed, Oct 24, 2018 at 8:14 PM nail13zg <nail13zg@centurytel.net> wrote:
> Ron, thanks for the response. Lot of good information. You have certainly
> had your hands full.
>
> As to my prop, It's a 3-blade Warp Drive, 72 inch diameter, set to 11
> degrees pitch which is what the company recommends. Still have to teach t
he
> blades to see what rpm they are turning at the 5000 engine rpm. That's a
> project for next week.
>
> Trey
>
>
> Sent from my Galaxy Tab=C2=AE A
>
> -------- Original message --------
> From: ron hansen <ronhansen123@gmail.com>
> Date: 10/24/18 10:20 AM (GMT-07:00)
> To: stratus-list@matronics.com
> Subject: Re: Stratus-List: static rpm
>
> Trey,
>
> Here are some dyno results I had done back in 2011. The lower HP one is
> how my Stratus-built EA81 worked from Stratus and how I flew off my initi
al
> 40 hours. That flying was done before the dyno and although I had far le
ss
> than 100HP available, I was able to achieve decent results in testing on
my
> Zenair 601HDS at max gross weight of 1320#. Not stunning, but okay. The
> engine ran like a top. I had some cooling issues that took many flights
to
> work out.....or so I thought.
>
> I had a valve failure on the ground and sent the engine to Ram Performanc
e
> in South Carolina. He said I had very uneven fuel distribution due to th
e
> Stratus carb design. He fixed the engine and put in spacers between the
> carbs and the heads that he had worked to develop. After that work is wh
at
> the second dyno chart represent. He said he re-timed the engine and that
> Stratus's timing specs are wonky and that's the main reason for the HP
> increase.
>
> Once the engine came back with more HP, I gradually increased the prop
> pitch and operated 100+ hours using about 4800 RPM for take off. It stil
l
> exceeded the performance from before the repair and the lower RPM was sti
ll
> giving me almost 100HP on takeoff. The higher prop pitch increased
> cruise. In cruise at full throttle, the RPM sometimes went to about 5000
.
> Still well below Stratus redline. I also liked the "non-screaming" aspec
t
> of the lower RPM.
>
> But the saga continues. About a year ago I was ground testing the Stratu
s
> secondary electronic ignition and it malfunctioned. It started firing
> completely out of sequence. As it bucked to a violent stop it cracked tw
o
> engine mounts, so here we go again. I sent it back to Ram and he said th
e
> engine was not damaged by the ignition event, but that I had excessive we
ar
> on the front cylinders due to "fuel washing" from, again, uneven fuel flo
w
> from the Stratus carb setup. Ram (Ron Carr) no longer messes with carbs
> due to this and he convinced me to have him install fuel injection and
> electronic ignition. I just got the engine back and have many hours of
> work to finish the installation. He ran a dyno test on the new setup and
> it maxes out around 108HP. I haven't scanned that result yet to attach.
>
> All this aside, the key thing to achieve before attempting flight is to
> ensure you have a prop within all design specs (e.g. pitch and diameter)
> turning within design RPM specs.
>
> Good luck with your project.
>
> Ron Hansen
> Los Angeles
>
>
> [image: image.jpeg]
>
> On Mon, Oct 22, 2018 at 10:14 PM Trey Moran <nail13zg@centurytel.net>
> wrote:
>
>> Ran my EA-81 for the first time at full power with the highest rpm I
>> could get at 5000. With the max being 5400, is 5000 what I should expect
>> for static at 3000 ft and about 15 deg above standard temp?
>>
>> Has anyone developed a performance chart for various altitudes and temps
?
>>
>>
>>
>> Trey Moran
>>
>> N13ZG
>>
>
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