I’m not sure the point of this is to be economical.
I don’t see one flying in the UK under LAA permit any time soon though.
from the manufacturers website
Normal cruise 0.901 lb/HP/hr
180HP X .901lb = 162.18lbs – 162lbs of Jet A is 93 litres of fuel an hour – VFR minimums you have best 2 hours of flight
To get to 60 litres of fuel an hour you would have to throttle back to 116HP – at that point just install a turbo rotax –
https://www.pbsaerospace.com/aerospace-products/engines/turboprop-engines/ts-100-turboshaft-engine
Could this turbine be used with other aircraft as a convertion?
IO390 wrote:
hat turboprop version must be incredibly good fun. Looks like a miniature PC-21.
Yes, I was looking at the videos of it the other day. It’s fabulous looking. I expect it would be €300-400K?? If the regular one with a few options is £200k plus 20% vat, surely the turbine one is at least 40% more…
That turboprop version must be incredibly good fun. Looks like a miniature PC-21.
I’d really like to fly the Stream, I’ve done a few hours in a TL Sting S3 which is great fun to fly. Very nice handling (except the full flap stall…) and lands easier than a C150. Being fully carbon it does feel more substantial than fibreglass equivalents.
https://www.tl-ultralight.cz/en/ultralight-aircraft/stream-turbo
Looks like they’ve come up with a beefed-up version. No speeds listed, but will be way over 200 KTAS no? Empty weight 450 kg, MTOM 800 kg. So it’s not an ULM, and I wonder what the plan is here. CS23 certification? Or just for the military?
Apart from the tandem seater, they also introduced a side-by-side ULM Stream, called the Sparker. An attractive design.
aart wrote:
But if one believes in simulation (a pretty poweful tool nowadays) it looks like the Blackshape would be OK to recover from a developed spin too:
Small differences even between different aircraft of the same type can mean a lot for spin characteristics. Are the models good enough for spins?
An incipient spin was done on the Blackshape apparently
But if one believes in simulation (a pretty poweful tool nowadays) it looks like the Blackshape would be OK to recover from a developed spin too:
https://www.politesi.polimi.it/bitstream/10589/141092/1/2018_04_Esposito.PDF
And if one does not believe in the power of simulation, one pulls the chute right after the first rotation 
[ local copy ]
Did they test spinning these aircraft?
I managed to fly the Stream and the Blackshape one after the other one day last week so could compare, in particular on things that are important to me..
Cockpit
I measure 1.91 cm and in the BS I barely fit up front and do not fit in the back. The Stream was fine. But it all depends on ‘head-to-butt’ length of course. Now with age we all shrink so fitting in is just a matter of time. 
The visibility is outstanding for both aircraft. Slight advantage for the Blackshape with its smaller wings.
Avionics, controls: I prefer the Stream’s Garmin 3X over the Blackshape’s Dynon. Sharper display to start with. Nice, separate A/P controls too. I like the side stick controls of the Stream better than the centre stick of the BS, if only because you can put stuff on your lap. Besides, the centre stick of the BS is rather low which I found a little awkward.
Flying
I am anal about sound levels. The Stream wins, but I suppose this is only because of the 3-blade prop vs the 2-bladed prop on the BS. My Bristell is rather quiet, but the Stream beats it! With the Bose A20 and a engine RPM of 5000 is was impressively quiet. I suppose it has to do with composites vs metal and maybe the smaller cross section of the fuselage, i.e. less surface of a vibrating bulkhead?
The in-flight handling is similar. Both are very stable in normal flight. Steep turns are like on rails. The Stream’s control are noticeably heavier though, probably because of the short arm to the first pivot point. A matter of personal taste. It definitively feels like flying a bigger aircraft. The electric trim on the Stream is too slow for my taste, repeatedly creating a PIO. But these things are just a matter of getting used to.
I did not do any stalls in the BS, pilot in the back told me it can easily drop a wing. Pilot in the back of the Stream told me the Stream does that too, so he asked me to make sure to keep the ball nicely centred. Stalls were consistent at 59 KIAS flaps up, plenty of buffet and rather mild.
Landing both planes is not a big deal. The slotted flaps on the Stream are very effective, but the smaller ailerons make larger inputs necessary to keep level at low speeds which became apparent after encountering some gusts on short final.
Speed is not a priority for me. I saw a slight advantage for the Blackshape but this may not be representative (different payload, and possible different accuracies of ASIs).BS 130 KIAS at 65%, Stream 125.
Some general observations
Both are nice machines and seem very well built. Although data is sketchy, the empty weight of the BS is higher, close to 400kg for a fully equipped one while the Stream is around 325 kg. Both aircraft are non-aerobatic but the BS is clearly capable of light-aero, positive G of course. Ask me how I know and I will tell you to get on YouTube, ahem The pilot who flew with me on the Stream categorically denied any aero capabilities..
As to track record, the BS is ahead as they have probably built around 50, while TL built less than 10 Streams. AFAIUI they are in the phase of a limited airworthiness regime that applies to a pre-production series of 10 exemplars. So know I can walk around the village here telling everyone I’m a certified test pilot. Going off buying a Buck Danny jacket tomorrow..
Tandem vs side-by-side. Obviously these planes are more pilot-oriented than ‘couple’ oriented. I’m not sure I’m going to score a lot of points with my loved one when I have to ask her to put the raft on her lap when we go to Catalonia.
Still I’m tempted to subtract 220 k from my kids’ inheritance, in spite of the stock markets of the last 3 days..
