ASW 27 Flight Testing Video Clip

On Wednesday, October 23, 2019 at 12:38:32 PM UTC-5, wrote:
Hi Chris,

Interesting modifications, congratulations to your achievement! Are the gelcoat-discolorations on the tail caused by the heat of the exhaust, or is this a result of fuel contamination? I remember that in some turbine powered gliders, the engines are slightly angled against the fuselage centerline in order to keep the heat away from the tail. If I am not mistaken, this was the case with the LS4 jet retrofit offered by M&D (https://md-flugzeugbau..de/en/areas-...rieb-mdtj-42/).

Christoph

The discoloration is a build up from a number of takeoffs and heat is not a problem. The diesel fuel is mixed with turbine oil for bearing lubrication which soils the tail. A wax/grease remover is needed for removal.

Nice. I am familiar with RC jet engines and the Jet Cat engines.

Thanks for the video and innovation. Continued good luck on your project.

On Wednesday, October 23, 2019 at 9:02:30 AM UTC-6, wrote:
On Tuesday, October 22, 2019 at 7:26:06 PM UTC-5, Mike N. wrote:
How do you manage turbine cool down requirements prior to retraction?

What is the fuel consumption rate for both take off power and cruise?

What is the service life of the turbines?

This is cool, I am asking because I find this very interesting.

Turbine cool down - All of the turbine engine data is monitored in the cockpit including the temperatures. After shutdown they stay extended until I see the temps drop to below 30C, then they are retracted. This will take about a minute.

The fuel consumption is really high. During takeoff I will burn a gallon every two minutes. An average 3k climb will burn just under 3 gallons. My cruise configuration will be using one turbine for sustainer at full power using 1 gallon every 4 minutes. One engine gives me a 300 fpm climb rate if needed or a fast cruise.

The service life is 25 hours. At that interval the manufacture will inspect and rebuild the engines to bring them back to new overhaul condition. The turbines are RC engines primarily intended for large RC aircraft. The engines are Jetcat P300 RX which have been replaced with the latest P300 Pro versions.

Very interesting. Thanks for posting this. 25hr service life seems really low. But I'm not familiar with jet engines that much, so I speak out of ignorance.

At 21:58 22 October 2019, wrote:
For the last month I have been flight testing the rebuilt ASW 27. The
progr=
am is going well and I am nearing completion of the required phase 1
testin=
g. I still have max gross weight, final spin testing and a tow test for
com=
pletion. So far I have only been able to self-launch since no towing is
ava=
ilable this late in the season. The twin turbines are working well and
prov=
ide a solid 600 fpm climb rate at these cooler fall temperatures. The
steer=
able tailwheel is also working well and provided good directional control
d=
uring takeoff and landing.=20

Here is a link to a compilation of short clips from the flight test
program=
..=20

https://www.youtube.com/watch?v=3DS_rFhN_abrQ

Chris

Damn, the video link no longer works. Any chance of a new link, please?

On Tuesday, October 22, 2019 at 4:58:19 PM UTC-5, wrote:
For the last month I have been flight testing the rebuilt ASW 27. The program is going well and I am nearing completion of the required phase 1 testing. I still have max gross weight, final spin testing and a tow test for completion. So far I have only been able to self-launch since no towing is available this late in the season. The twin turbines are working well and provide a solid 600 fpm climb rate at these cooler fall temperatures. The steerable tailwheel is also working well and provided good directional control during takeoff and landing.

Here is a link to a compilation of short clips from the flight test program.

https://www.youtube.com/watch?v=S_rFhN_abrQ

Chris
https://www.youtube.com/watch?v=S_rFhN_abrQ

At 13:46 24 October 2019, wrote:
On Tuesday, October 22, 2019 at 4:58:19 PM UTC-5,
wrote:
For the last month I have been flight testing the rebuilt ASW 27. The
pro=
gram is going well and I am nearing completion of the required phase 1
test=
ing. I still have max gross weight, final spin testing and a tow test for
c=
ompletion. So far I have only been able to self-launch since no towing is
a=
vailable this late in the season. The twin turbines are working well and
pr=
ovide a solid 600 fpm climb rate at these cooler fall temperatures. The
ste=
erable tailwheel is also working well and provided good directional
control=
during takeoff and landing.=20
=20
Here is a link to a compilation of short clips from the flight test
progr=
am.=20
=20
https://www.youtube.com/watch?v=3DS_rFhN_abrQ
=20
Chris
https://www.youtube.com/watch?v=3DS_rFhN_abrQ

Says "video unavailable".

Chris, maybe a link to your youtube channel instead?

Nice video. Welcome to the jet club. BTW, your canopy needs cleaning. Also, Bob Carlton and I have found that Windex easily removes the residue from jet exhaust on the tail. Use REAL Windex. Some of the off-brand blue glass cleaners won't do it.

At 14:36 24 October 2019, Never Again 2 wrote:
At 13:46 24 October 2019, wrote:
On Tuesday, October 22, 2019 at 4:58:19 PM UTC-5,
wrote:
For the last month I have been flight testing the rebuilt ASW 27. The
pro=
gram is going well and I am nearing completion of the required phase 1
test=
ing. I still have max gross weight, final spin testing and a tow test
for
c=
ompletion. So far I have only been able to self-launch since no towing
is
a=
vailable this late in the season. The twin turbines are working well and
pr=
ovide a solid 600 fpm climb rate at these cooler fall temperatures. The
ste=
erable tailwheel is also working well and provided good directional
control=
during takeoff and landing.=20
=20
Here is a link to a compilation of short clips from the flight test
progr=
am.=20
=20
https://www.youtube.com/watch?v=3DS_rFhN_abrQ
=20
Chris
https://www.youtube.com/watch?v=3DS_rFhN_abrQ

Says "video unavailable".


gliderpilot.net mangles urls. Take out the "3D", should be
"v=S_rFhN_abrQ".

gliderpilot.net mangles urls. Take out the "3D", should b
"v=S_rFhN_abrQ".

That worked, thank you.