Menu Sign In Contact FAQ
Banner
Welcome to our forums

Diamond DA50

I get 150-155kt TAS at FL100 at 10.5 USG/hr.

Or 138kt IAS at 2000ft at 11.7 USG/hr.

Administrator
Shoreham EGKA, United Kingdom

Peter wrote:

get 150-155kt TAS at FL100 at 10.5 USG/hr..

Maybe slight thread drift here, but Peter your TB20 seams to perform better than book values – at least if your under simmilar conditions like in the POH. Weight/ISA? And POH values is based on an aircraft even without antennas and lights which makes is unlikely for real world aircraft to achieve. Modifications? Nanocoating wax

THY
EKRK, Denmark

They are real values. My ASI is calibrated (and was checked 3 weeks ago professionally). The Socata POH is weird. Lots of previous discussions in TB threads; they don’t seem to be running at peak EGT, but nobody is quite sure. The POH is dated from the 1980s.

The DA50 is a diesel engine, which has a much higher CR, and the SFC of a piston engine is proportional to sqrt(CR) so if you e.g. increase the CR by 20% you get 10% more HP for the same flow (of the same fuel – that’s another story). Diesels are a lot more efficient; the DA42 does the same IAS as me for the same total fuel flow. And the SR22 and C400/TTX also do 138kt IAS at 11.7 USG/hr.

Administrator
Shoreham EGKA, United Kingdom

THY wrote:

And POH values is based on an aircraft even without antennas and lights which makes is unlikely for real world aircraft to achieve.

In my experience, POHs are more realistic than people give them credit for. In a recent flight with a 1979 Archer II loaded to max gross and with 10 antennas of various kinds, I observed a TAS 2-3 kt below book value. The POH says that without wheel fairings you lose 8 kt. The aircraft had main wheel fairings, but not nose wheel fairings, so losing 2-3 kt seems to be about what you could expect.

ESKC (Uppsala/Sundbro), Sweden

The only aircraft I’ve really tried to compare to the POH power and speed tables was the club Bonanza in Houston (an S-35). It was absolutely bang on the money, despite being old with slightly scruffy paint.

Andreas IOM



They are trying to sell the story to the people in the US that it is a more than sufficiently powered aircraft. I think they say it four times how „powerful“ the engine is. Which of course it is not, in the context of the very heavy airframe. Let‘s see how long it will take for that market to realize this.

Last Edited by boscomantico at 27 Jul 12:40
Mainz (EDFZ), Germany

boscomantico wrote:

They are trying to sell the story to the people in the US that it is a more than sufficiently powered aircraft. I think they say it four times how „powerful“ the engine is. Which of course it is not, in the context of the very heavy airframe

Diamon Aircraft have a huge market base of US fans, so I am sure lot won’t realize or just don’t want to…

Also with 3km runways in flat land, the heavy airframes & less powerful engines is “still acceptable” as long as one sits on high KTAS cruises & low GPH burns? SR20/DA40 had lot of sucess in US while in Europe some are found in 600 runway hedge during the summer…

Last Edited by Ibra at 27 Jul 13:12
Paris/Essex, United Kingdom
Sign in to add your message

Threads possibly related to this one

Back to Top