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Messages - Wragie

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1
Hangar Flying / VariEze 3 View
« on: June 23, 2006, 02:00:38 PM »
Just wondering if someone could help me out with a hi res 3 view
of a VariEze?

Just looking for that not plans (unless they are a real deal  :D )

Dave

2
Hangar Flying / Prop spacers + exhaust
« on: November 08, 2005, 09:01:35 PM »
Actually that is what Lopresti found when he went over the Mooney's
cowling. Remember when they went from the big pie plate opening next
to the spinner and then they were two tiny 4" dia hole as far away from
the spinner and center as possible. And after that everyone had that style
f they were going fast or just pretending to.

The prop does drag air with it as it rotates and does stuff it back into the
cowl. Lopresti found the cooling improved as well. If I recall right he thought
it was due to how much of the time the holes were covered by the blades
and stuffing the air in and dragging it back out as the blade passes. The
closer to the prop hub the worse it does this.


Thats actually kind of interesting Walter, I wouldn't have thought you
would see that on a trailing edge cowl. Guess it shows just how strong
that wave really is.

Dave

Quote from: "Waiter"


My theory is that the bow wave from the prop would actually push air back into the rear opening. Maybe someone with more insight could add to this!

Waiter

3
Hangar Flying / Prop spacers + exhaust
« on: November 08, 2005, 10:21:58 AM »
This is sort of a weird question and I'm asking to see if real world is what
my theory tells me is right.

What I would like to know is basically what if any changes were noticed
when you changed from or to a prop hub extension. Anything is helpful
here so if all you noticed was more exhaust on the blades or quieter or
faster and so on thats what I'd like to know.

I am curious if there is a optimal separation distance from the trailing edge
of the cowling to the prop. If it doesn't seem to matter then I'm fine,
if it needs an extension then I need to replace my crank as I have
the thin flanged lycosaur crank which is unfriendly towards these.

And now for something completely different. Almost.

I'm also wondering if anyone has tried to modify the exhaust  so that it
exits outside of the prop arc. I know that would take a bit of doing but
I'd be willing to bet someone somewhere has done it.  Again wondering
if the improvements were that measurable.

I now return you to your regularly scheduled reality....

Dave

4
Hangar Flying / VariEze engines
« on: August 15, 2005, 02:46:50 PM »
Now that you mention the 0-320 that vaugely rings a bell. Seem to recall
more about Rutan having a cow about it than anything else.

Do you know what it performed like? seems like it would be a real rocket
to me.

Dave

5
Hangar Flying / VariEze engines
« on: August 15, 2005, 06:11:39 AM »
Hi

I know the 0-200 is the biggest engine normally found in a Vari but
I was talking to a friend and he swears up and down someone built
one with a Lyc 0-290 a few years back. I could see being able to  do it with extra nose ballast and of course new cowling etc. Does thing ring
a bell with anyone?

Dave

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