olnico

Here is a video of my modified Phoenix and M90 ( Thrust to weight ratio: 1,1 to 1 )
I must give my congratulations to the cameraman who had a hard time to follow the plane's evolutions. Thanks Reno...
Enjoy the music ( sorry for that, but I had to please the video editor... )

http://www.geohei.lu/olin/videos/Hob...enixM90web.wmv


The M90/JC Rabbit is an absolutely amazing engine that have transformed this plane. Given the possibilities offered by this combination, I took the opportunity to optimize the airframe for high alfa/ 3D flight. Note that the plane on the video has no controllable tailpipe.
I had to adapt my flying style to the new combination and design. I am still discovering new aerobatic possibilities with this setup...

Note that AD will produce a dedicated version of the Phoenix to my specifications to match this engine.

Also note that a complete M90 review will publish in the March/April RCJI magazine. It will be of the same layout as the P-160SX review: Tom will provide all the technical data and measurements [8D]

Gaspar

Thanks for sharing.

For us is really motivating that, after many month of hard work and tests, our customers are pleased by the results.

Jets Munt team.

acw

My Feedback: (1)

Great video (and music )

Is the M90 the same as JC Rabbit? I have just installed a Rabbit in a SM Gripen. Can't wait to try it.

Arnaud

niteman

Hi Oliver,

Video is great !! I'm building the same red Phoenix as you have and have not decided on a turbine yet, but leaning toward a potential rocket with a P-120sx - however the M90 and JC Rabbit have both caught my attention.

Could you kindly tell me if you upgraded the fuel cell from the stock 2 liter tank or added another tank as well ??

How long are your flight times with the new M90 ??

Spool-up time and throttle response of the M-90 ??

Can you tell me where your C.G. is ??

Size of batteries on board and where you put them ??

Thank you in advance for any help.

Dan

Robrow

I have an M90/Bobcat combo and flying a mixed variety of throttle settings I get 10mins + on the standard 2x 33 fl.oz wing tanks without cutting into the 3rd tank, though I don't maybe use the throttle as a switch as much as some Nailing it to the floor from start to finish you'll get around 6.5mins from your 2 litres, at that my engine is giving out just shy of 22 lbs.

Rob.

olnico

Thanks to you Gaspar for designing this fantastic engine.
This weight to thrust ratio opens new possibilities. Having a lightly loaded aircraft like the Phoenix powered with a 1,1/1 ratio gives fantastic prospect.
What you see in this video is just a beginning. I've just discovered a new plane that does virtually not stall...

olnico

Yes, almost. It shares the same internals.
The tailpipe is different as well as the plug and mounting bracket.
The software is also a bit different.

The Rabbit comes with a lifetime warranty, whereas the M90 is covered for a 3 years period if I am correct.

olnico

Thanks Dan,

The secret is to keep it light and simple. You'll have problems with the engine cut that is too narrow for the 120sx.
The M90 is much lighter and gives almost the same levels of thrust.
I have seen a P-120 SE powered Phoenix a while ago and the M90 I have here delivers virtually the same level of performance on this aircraft.
Altogether, the power to weight ratio will be the same with a 120sx since you'll have to increase the tank capacity and modify the fuselage. You'll loose the extra 10N of thrust benefit from an increase of weight of probably 1 kg.
The standard 6.2 l fuel cell is enough for 9 minutes of flight with a 2 go-arounds margin.
I usually fly for 9 minutes ( timer setting )
Spool up time: 5,4 seconds on all the 3 engines I have seen ( and tested for 2 of them )

CG 160 mm from the boom leading edge. The plane shall almost fall on the tail when the tank is empty ( no crosswind taxi with an empty tank )

Batteries: 2 x A123 1000 mAh for the receiver ( enough for 5 flights ) location: just behind the tank holder frame.
1x 2000 2S1P lipo for the Merlin. It is a very light TP battery I've used to save weight ( 80 gr saved from the stock Merlin Lipo ) location: strapped on the nose gear plate.

The nose is totally empty. Everything is moved as far to the back as possible.
All travels increased to 130%.
The rudders surface is increased by 30%, the elevator surface is increased by 40% with turbulators.

One important thing is to achieve a slop free servo setup, which is a bit tricky with the plastic mounts/hatch provided. But it's possible ( I used hot glue to fix the servo additionally to the plastic strap fastening ).

Also check the rear spar gluing from the back of the flight controls opening. Some planes had a problem here.

niteman

Thank you very much Oliver for all of your advice and support !



BTW: Got any Pic's you can share of your setup ??



Best, Dan

olnico

Installation of the M90 in the Phoenix:



Extremely standard. No modification required on the Phoenix. The fuselage hard mount reinforcements are suitable for the M90.

Flight picture:



This one shows the very high flap deflection for landing ( 50° at least )
This deflection is necessary to increase the drag to a maximum for landing. The Phoenix airfoil is so clean that it needs this.
Also it reduces the aircraft's tendency to bounce on landing.

Three engine powered version:

niteman

Thanks for the pictures Oliver

BaldEagel

Oli

The link to the vidio seems not to work, is there an alternative or new link?

Mike

highhorse

My Feedback: (2)

Ditto. the link is inop.

BaldEagel

Bump.

olnico

Here is a link to the video. I am uploading it again at the moment:
http://www.geohei.lu/olin/videos/Hob...enixM90web.wmv