Re: EXT :Re: [Q-List] Q2 down

Mike Dwyer

Hi Richard.
The Q200 had early on the two piece venturi and later the single piece venturi.  Both worked well.
It had two layers of plastic screen over the cold air input as a rock filter but nothing else.
I always read the Q-List and comment when I've got some data!  Been working hard on a fancy upgraded Velocity (friends, not mine) so I can get back in the air soon!  Kinda thinking of getting a couple electric scooters and tossing them in the rear seats!  Always hated getting somewhere and then having to find ground transport.
Fly Safe.
Mike Dwyer

Q200 Website:

On Wed, Oct 19, 2022 at 11:18 AM Richard Thomson <richard@...> wrote:

Great Carb Mike, do you know what venturi were you using ? Also did you have a full filter on the carb intake / heat box ?

Rich T

On 19/10/2022 00:33, Mike Dwyer wrote:
I used to operate my Q200 at 12 to 14,500 feet, probably density altitudes at least 2000 feet higher than that with no issue seen.  Typically using no ethanol auto gas.  I had 500 fpm climb rate left at 14,000 ft.  MA3SPA carb.
Mike Dwyer xQ200

On Tue, Oct 18, 2022, 14:25 Kidd, Robert L [US] (IS) <robert.kidd@...> wrote:


I found your post to be very interesting. 

Sunday afternoon I was returning to Logan Utah from Halfway Oregon, in a Cessna 150.  Was cruising along at 9,500 MSL, leaned and throttled back slightly.  I attempted to climb higher to clear some terrain and at about 10k’ my engine stumbled and began to run rough.  I pulled the carb heat on and it cleaned up momentarily before it continued to run rough, so full rich mixture added kept it stumbling along.  I have experienced this before when running Mogas, and thought I had cured the problem with a replacement fuel line between my gascolator and the carb, and installing firesleeve over that fuel line.  I’ve been able to fly to 10,500 without issues, and this time I had a mix of Mogas and Avgas (about a 5:8 ratio), and was surprised to once again experience symptoms of vapor locking.  I was almost over Idaho City (U98) and debated landing but opted to turn south to lower terrain.  Full carb heat, full rich carb mix, and occasionally having to pump the throttle to keep it running, I descended to about 6700’, skirting the east corner of Boise’s airspace, before it started to run reasonably.  I was able to adjust the mixture, but still had to maintain the carb heat setting as I made my way to Gooding for a fuel stop.   As I closed in on Gooding, I was able to adjust the carb heat off.  After I landed at Gooding and fueled up, the rest of the flight home was uneventful, even when I climbed back up to 9,500’. 

I’ve never had an issue when I’ve run straight Avgas, and thought I had enough Avgas that I couldn’t have any issues with the mixture of Mogas I was running, but maybe somebody’s chemistry changed, or some other reason that I haven’t worked out yet.  I’ve wondered about installing a fuel pump somewhere in the system, to turn on when this event happens.  I don’t suppose most of the Cessna 150’s are operating at these altitudes.  Perhaps something similar happened to the Q2 that went down in Wyoming…

Thanks for sharing your insights.

Robert Kidd

Logan, UT


From: <> On Behalf Of Jay Scheevel
Sent: Tuesday, October 18, 2022 8:54 AM
Subject: EXT :Re: [Q-List] Q2 down


Not to get too far over my skis here, but when I did the comprehensive summary of Q accident statistics ( Type Aircraft Accident Analysis.pdf ), I found that the number one cause of engine failure was actually a failure in fuel delivery (Fuel starvation due to fuel delivery problem or fuel exhaustion). This is not unlike the statistics in  homebuilts in general, so is important even if not building a Q.


I have tested my fuel delivery system’s reliability from near sea level to 18,000 feet. I find that my system does behave differently depending on altitude. By this, I mean not just mixture and carburetion, but flow through fuel lines, pumps, induction air and regulator all behave differently.  If you have not tested your fuel system for robust reliability at all altitudes within your altitude envelope, then caution is warranted as you expand the envelope, because the fuel flow may suddenly become unreliable.


So indirectly, going to your original question, your engine-altitude performance may be a complicating issue, because in high terrain, you may not be able to maintain sufficient AGL to glide to a safe landing area if an engine problem develops.





From: <> On Behalf Of Edwin Medina
Sent: Tuesday, October 18, 2022 8:26 AM
Subject: Re: [Q-List] Q2 down


Jay I agree we are just curious what happens to learn from that! In my case I'm still rebuilding my Quickie and never flew one before and want to learn!



On Tue, Oct 18, 2022 at 10:21 AM Jay Scheevel <jay@...> wrote:

Looks like the engine was not running, so I don’t think it was a performance question.


What I am saying, since the airplane is based in Vancouver, so that the pilot would have a lot to handle, first with the engine out, next with the density altitude that was likely over 11,000’, then with wind and possibly gusty wind. Was a good landing, all of that considered.


My thought is that she went for the pavement, but probably broke the canard on the road and then veered off into the sage brush. Not a bad strategy, actually, given those conditions!


Also looks like new blacktop with a huge shoulder drop off.






From: <> On Behalf Of Fredd Baber
Sent: Tuesday, October 18, 2022 7:37 AM
Subject: Re: [Q-List] Q2 down


Jay- are saying it was maybe above it’s max ceiling at 10,000MSL?  And that may have caused the engine out?  What is the max ceiling for a VW engine powered Q2 or Dfly?




Fredd Baber


On Oct 17, 2022, at 10:40 PM, Jay Scheevel <jay@...> wrote:

Looks like it was a VW powered Q2, flying from British Columbia to Florida. Single pilot. Need at least 10,000 MSL to clear that pass. No prop damage, so probably an engine out,


I flew over this same place coming back from Kevin’s FOD a few weeks ago. Winds are commonly strong and gusty so can complicate things. May have been an issue for a “low lander” at high density altitude with no engine. 







On Oct 17, 2022, at 6:57 PM, Mike via <n7000t@...> wrote:

Anyone know about this?
looks like the “t tail” reflexor Links:

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