flyrotary@lancaironline.net Mailing List Archive

I'm replying to a couple posts here so if I'm a bit disjointed bear with me. First, for Charlie. I have been working with Steve, at the location of the dyno frequently. Yes I obviously have heard the muffler first hand. It works great. I am glad there isn't a huge HP penalty! For Bobby, Mark's work was super he spoke to Steve and I on several occasions. His passing is very sad. With regard to the welded p-port. You can do it if you want but I won't fly behind it. Just too risky without post-weld heat treatment. A crack with any water pressure behind it will put water directly into the combustion chamber.

Bill Jepson

On Oct 20, 2016 8:37 AM, "Bobby J. Hughes" <flyrotary@lancaironline.net> wrote:

I intended to say the “guy’s” down under referring to Neil and Christian. I’m really happy to see the renewed development efforts for PSRU options and P-Port housings. Also enjoying the increased flyrotary list activity.

Bobby

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, October 20, 2016 9:05 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: [Flyrotary] Re: Just a bit of a update

Bill,
If no sealant is used then I’m assuming the coolant passages are not totally blocked. Mark Steitle’s P-Port has about 150 hours with the inserts welded to the liner. Mark was an excellent welding and I’m sure he back purged to minimize crystallization. But who knows how long they will last and the failure mode. Small coolant leak, large coolant leak or apex seal failure. At least with the 20B an apex seal failure is not likely to stress the gearbox and should allow for a safe landing with a reasonable smooth engine. Not so with 2 rotors.

Any chance you guys will offer the p-port housing service to folks on this list? I’ve got another FWF renesis under slow development in the garage. Getting close to finishing up the plugs up oil pan and block off plate. The exhaust headers and turbo are next and then the intake manifold. On the fence about the p-port but I’m encouraged by all the effort and seemingly positive results from your efforts and they guy down under. I’m running 7000 rpm / 38” MP for takeoff with the super charger and cruise at 4800 – 5200 rpm / 28-32” MP. P-Porting would probably allow for lower MP for takeoff and still normalize for cruise.

Bobby
RV10 \ Super Charged Renesis
About 400 hobbs / 310 flight hours
bhughes@qnsi.net

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, October 17, 2016 5:59 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Just a bit of a update

Charlie,
Pardon my haste in the original reply. The butterflies are very similar to the original, with the exception that we have devised a new way to make them that doesn't require drilling through the housings. Can't say more right now other than we do NOT use epoxy in the housings and NO sealing problems. Don't expect any. Also we DO NOT weld to the liner as sometimes pushed by others. I do not believe you can weld to the liner without catastrophic failure later. I believe you will either fail your apex seals or crack the weld due to crystallization of the steel. The muffler is a MAJOR win. It is quieter than a unmuffled Lyc, and successfully kills the annoying hi frequencies. It is more restrictive than some but only costs us a few HP. It also fits in an RV-3! I am experimenting with a larger version in hopes of repeating the success with a bit less restriction on cowls that aren't as tight as the RV-3
Bill

On Mon, Oct 17, 2016 at 3:15 PM, Charlie England <flyrotary@lancaironline.net> wrote:
Hi Bill,

Thanks for the link. I've been following it on the Homebuilt Airplanes forum; are you 'billsrv4' over there?

I've been trying to find a throttle mechanism in the video, but don't see one. Are they using the custom 'in the housing' butterflies, like the original Powersport engine?

Have you heard it run in person? If so, does the muffler work as well as it seems to in the video? (Hard to know how much the audio is clipped in level on a recording.)

Thanks,

Charlie

On Mon, Oct 17, 2016 at 4:52 PM, William Jepson <flyrotary@lancaironline.net> wrote:
Since it has been so quiet thought I would make some noise.
Try this package on for size.
https://www.youtube.com/watch?v=EfreUJt-Fsk.
Think you will find it interesting.
Bill