Hi Bruce, A few years ago, I tried modeling the existing LS1 and only changing the shape of the elevator to try to eliminate the strong asymmetric pressure on the trailing edge (which is the

Bruce, There would be no sparrow strainers on a Roncz canard, and the Roncz airfoil is thick enough (20.5%) vs. the GU thickness (21%) that the standard GU canard construction method could be used

I see no Sparrow Strainer! We've been "punked"! Shoulda, Coulda Woulda! B Please note: message attached From: "Jay Scheevel" <jay@...> To: <main@Q-List.groups.io> Subject: Re: [Q-List] Sparrow

Jay, The UIUC airfoil database has two files: AMSOIL1.DAT is the canard airfoil, AMSOIL2.DAT is the wing airfoil. They’re similar, but the canard airfoil has more camber. I’ve done zero

Here’s another one:

Hi David, This is what I got off the University of Illinois airfoil database. There are two airfoils there listed under Rutan Amsoil racer. They look to be very similar. I wonder if they used

Jay, I think you’ve got the wrong airfoil there. The topic of discussion is canard airfoil, you’re showing the Amsoil Racer *wing* airfoil. That said, what airfoil software are you

Jim, My C150 was leaving a trail when I’d land and taxi, I thought the seal on the vacuum pump shaft was leaking, so I replaced it several times before I dug a bit deeper and tightened the bottom

To date, has there been a Q with the Roncz airfoil built and flown?

Since it was built as a pylon racer, the mission was quite different than fast cruise. Not sure, but I think Roncz designed the Amsoil airfoils also. Take a look at the area behind the 50% chord, you

Looks almost symmetrical! Would perhaps need a bit of up incidence for cruise. But then you're not looking for just cruise when racing! Bruce Please note: message attached From: "Jay Scheevel"

Nothing on the threads. The thread locker goes in the silk thread around the through bolt. My mid engine through bolt has been dry for years. The left two through bolts have not. Today I hope to

I am not sure you wouldn’t (double negative?) get a similar positive seal on those threads if you were to just dress them with Hylomar without the silk thread trick. But I’m listening. Phil

I think it looked more like this.

Did they use the Roncz canard on the Amzoil Racer? Didn't Burt design that bird? Bruce

I think that the Roncz airfoil would probably have been the way to go, but unfortunately, as David said, Burt Rutan did not win that argument. I think, if that airfoil had been used, there would have

I am sorry I did not explain myself good enough! None of the thread or locker is to go under the cylinder base bolts or cylinder skirt for the through bolt Jim is talking about! It is to go inside

Thanks for the input Bruce and Sam. I will ask on continental engine site. Not sure how installing silk thread could change the torque characteristics. Looks like Bruce will be providing an update

Jim, also try posting on the https://smallcontinentalengines.groups.io/g/main Silk thread under the through bolts? I dunno. That sounds like the kind of thing that could cause an issue with

I like this picture. I wasn't smart 'nough to understand the others you sent Jay. I am noticing the aft end of the airfoils look different. It looks like there is negative camber on the aft end of