Tow plane types/mods for high density altitude glider towing

On Wed, 14 Aug 2019 09:34:59 -0700, Craig Funston wrote:

On Wednesday, August 14, 2019 at 7:33:57 AM UTC-7, Dan Marotta wrote:
That is super!

Was there any difficulty with your CAA or was the GFA authorized to
make those mods?

On 8/13/2019 2:08 PM, JS wrote:
Regarding mods, the eTug deserves mention.
A Pawnee with a 350 cubic inch Chevy LS1 running on Mogas. Early
experiments provided too steep a climb angle, so the original 4-blade
prop was adjusted to decrease the climb rate. Now it has a different
prop.
I've hooked many gliders up to eTug, yet to tow behind it.

https://www.glidingclub.org.au/membe...aircraft/etug/

These days a crate LS3 engine can be purchased for about $8000 and
produces 430HP on Mogas. Car engines require a PSRU (speed
reduction).

https://www.gmperformancemotor.com/parts/19370416.html?
gclid=Cj0KCQjwv8nqBRDGARIsAHfR9wC30A7wF3SFSrhYOBoL dkinr_7MGZMpHxignUEhA1qfW5iBSSEbHwAaAhPlEALw_wcB

Not much concern about shock cooling or leaded Avgas going away.
Jim

--
Dan, 5J

Akaflieg Stuttgart just flew their concept of an optimized towplane.
Congratulations to all the students and their mentors.

https://akaflieg.hg.stuvus.uni-stutt...erstflug-fs35-
harpyie/?
fbclid=IwAR1rgq8zp1xdRFvQTqvAQGbklVeiF76CE0bKvKbdx jlFvEvgsGCyBGeZLCI

I remember a couple of specialist tow planes appearing a few years ago,
apparently to disappear without trace a bit later. One came from an
Akaflieg and was dual purpose: two seat aerobatic aircraft and tow-plane.
The other was from the Finnish Akaflieg equivalent - the PIK-27.

Are either in use as tow-planes now?

Has more than the prototype of either type been built?


--
Martin | martin at
Gregorie | gregorie dot org