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Jerry,
I would be happy to help with your single development as I'm kinda stalled at the moment - to many other things on the go. I'm sure Richard would help as well.
If you don't want to clog up the discussion group, contact me directly as I don't have this info on a web site - lendich@optusnet.com.au
There are on a couple of difficult things in developing a single, one is a single crank shaft, I'm still trying to get them made cost effectively locally. I have all the drawings and tolerances to hand.
Another is the dampening issue of the PSRU and I believe that Richard's system is in line with my gut feeling on the issue.
I am using the high compression RX8 rotor (with 12A end housings)with fly-cut 3mm apex seal slots, why- two reasons? their half the price of the RX7 rotors and the flycutting costs about $40. Why use 3mm? cutting a new slot has to be less precise as even cutting with a wire will leave a small bump from old slot to the extension in a 2mm apex seal slot. This bump is consider a possible hang up position of the apex seal and is therefore considered unsafe.
The second reason is that the higher compression will provide higher horse power.
Of course precise balancing is needed but is a good thing to get done for any rebuild with mixed components. This is not overly expensive, but there are a few tricks to it.
Of course PP is the better way to go IMHO.
Having said these things there are a number of ways to do a single - all
successful. My way is only my opinion and is in no way against other opinion. For instance Richard will/may look at things differently.
George (down under)
George do you have a web site with single rotor info? I am just getting interested myself. I have the raw materials for two p ported engines not including the e shafts. I am going to contact Richard Sohn also. I have not done an archive search yet, so that will be first. Jerry
On Dec 8, 2006, at 5:11 PM, George Lendich wrote:
Jerry,
Tell him to consider a single rotor- with PSRU.
George (down under)
Perry are you still using direct drive? What max RPM are you or were you using, what prop, etc. A friend who is building a Buttercup (Steve Whitman design) that only needs 100/125 hp. 13B with redrive is too heavy but without a drive it is a possibility. Jerry
On Dec 8, 2006, at 1:43 PM, Perry Mick wrote:
I just installed a CDI system on the leading coil in my RX-7, testing it out before possibly putting it in the airplane.
I don't have an issue with carbon plug fouling, only the dreaded lead. Is the lead fouling an insulation effect (a lead compound) on the electrode? If so, then I could see where a CDI system would help punch through. However, if the plugs are fouling because the lead puts a conductive film on the ceramic insulator, causing the electrode to be shorted to ground, then maybe a CDI system can't help with that?
Interesting stat: I have never ever in hundreds of hours flooded the rotary engine on my Long-EZ. It always starts on the first crank.
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