Here's an exercise. Look at the Duo's L/D curve for the value at a useful
speed like 100kts then divide that into the flying weight. That will be the
thrust required to maintain level flight at that speed.

Maybe replacing that balky IC engine & prop with one or two of Bob Carlsons
dinky microjets that burn the Jet-A ballast might work.

Here's how it worked out with the Nimbus 2C. L/D at 100 Kts at 1433 lbs. GW
is 37:1. 1433/37 = 39Lbs thrust. One AMT microjet produces 54 pounds of
thrust at 100 Kats - probably up to the flight levels. That's good cruise
plus a little extra. It gets even better as the fuel weight burns off.

Bill Daniels


"BTIZ" wrote in message
news:kdPhf.4918$pF.3815@fed1read04...
ok... I have received two lashes with the noodle that the Duo T is a
"sustainer" and not self launch...

but by the same token... of the Duo T can only "sustain" 6500MSL DA... it
is
nothing more than a glider out here... I'll admit... I did use that word
"take off" in regards to "sustainer" operations

The POINT is that Density Altitude during standard summer operations will
make the use of the "sustainer engine" worthless. 6500DA is below GROUND
LEVEL in our peak flying season, maybe it will only extend the glide back
to
something landable.. but I would not want to count on it to "maintain
altitude".

But then again.. with temps such as these.. we don't need no stinking
engine.

BT

"BTIZ" wrote in message
news:swNhf.4913$pF.4792@fed1read04...
Now that is an interesting data point... I'd be interested in others
also..

If that DuoT can't climb above 6500ft MSL at better than 150fpm, then I
would not even attempt a takeoff out here in the summer time. Airport
Elev, 2833MSL, Baro 30.00, Temp 100F, puts the DA at 6000ft. Granted
there
can be found a thermal right on the runway to assist, but there is also
strong down near strong up.

Another favorite launch site, at 5500MSL, Baro 30.00 and 90F puts the DA
at 8500, even if the temp is still only 80F, the DA is 7940.

I've noticed a DG500M on the market that flies regularly out of
Colorado,
would the seller care to offer some data points?

Maybe the DG808B?

BT
"Gary Emerson" wrote in message
news
Greetings,

Looking for some real world data on what the max altitude that a Duo T
can sustain level flight. Would also be nice to know what sort of
climb
performance people have seen at lower altitudes. I know it'll climb to
6500ft MSL and average around 150 FPM, but hoping to get more data
points.

Gary