---------------------------------------------------------- Stratus-List Digest Archive --- Total Messages Posted Thu 10/25/18: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:58 AM - Re: static rpm (ron hansen) ________________________________ Message 1 _____________________________________ Time: 09:58:50 AM PST US From: ron hansen Subject: Re: Stratus-List: static rpm Best of luck with everything. Ron On Wed, Oct 24, 2018 at 8:14 PM nail13zg 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 > 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 > 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 >> > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message stratus-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Stratus-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/stratus-list Browse Digests http://www.matronics.com/digest/stratus-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.