RE: MK Aurora 60 build - engine installation question
 

It'll have enough power even if it's spitting oil out the pipe, but it'll have less and less if run too lean over a period of time. I run engines rich when new, very smoky rich. Then flight after flight lean them to find a good clean run, over time and from the rich side.
I am still running my OS 61 FSR rich after 40 flights, and the pipe is still too long just to be conservative on piston and liner wear.

By the way, your Aurora looks beautiful.

Chris...

RE: MK Aurora 60 build - engine installation question
 

you can go down in pitch till the engine loosens up..12-8 will still haul the mail at pattern speed, less stress

RE: MK Aurora 60 build - engine installation question
 

12x8 will over rev the motor .. The Hanno is designed to run at around 9600rpms on a 12x12.. this motor because of the porting produces max power at that rpm.. If you over rev you could quiken the flacking of the liner these motors are known for or possibly break a rod. I would run rich on the needle a click or 3 and go no lower than a 12x11.


Gary

RE: MK Aurora 60 build - engine installation question
 

Thanks for your input about the Hanno redhead.

Currently it turns a 12x10, the original OS header was cut by only 1/2", reason was to get the red pipe into its place under the wing of the Aurora. It just fits now. I am aiming at around 10.500rpm on ground.
I think I just have to be little patient, run it as rich as it tolerates and do some gentle traffic pattern flights. The plane flies beautifully.

My std. RF61-P turns 12.200 with a 12x8 on ground.

RE: MK Aurora 60 build - engine installation question
 

Yes, please be very careful on these engines. The Hanno liner is really known to have many troubles with pealing especially with the new synth. fuels. You may want to add some caster in your fuel. I add 4 oz. per gal. to Power Master 20/20 fuel. OS had so much trouble with the liners that they also ran a small bunch of ringed versions of the Hanno. But I dont think the power was the same, as the ringed version did not have the exhaust "power boost" notches the ABN version have.
Awsome job Speed! That is the cleanest radio compartment I've seen in any plane!

DM

RE: MK Aurora 60 build - engine installation question
 

Thanks for the flowers...!
I have just seen so many really nice planes and RC compartments here on RCU that I tries to do similar on the Aurora (for the first time).

About the Hanno issue: I am expecting the conrod and crank back soon.

Has anyone heard of some kind of mechanical treatment to the OD of the cylinder liner? Goal is to reduce the ID at TDC area by minimal amount to acheive good compression again on a worn out liner/piston set. Thsi may be a hydraulic forge or??
Mainly this treatment seems to be done on the smaller RC car and buggy engines (.21 and .28 displacement).

RE: MK Aurora 60 build - engine installation question
 

most of the sleeve shrinkers use a vice with soft blocks to press sleeve into shrinker die, this is for brass sleeves, aluminum sleeves seem to not develop the bellmouth syndrome, FYI jett engineering use more than .007 clearance on the rod to journal clearance, it allows for more oil to accumulate in bearing area, i havent see a hanno break a rod from anything but a shaft run.

RE: MK Aurora 60 build - engine installation question
 

Er... That would be Joe's classic DB scheme, correcto?

Nice work on your Aurora!

David

RE: MK Aurora 60 build - engine installation question
 

Got the liner and piston of my Hanno Special back some weeks ago after that sleeve shrinkage process.
Now found the time to make test runs.

Wow, I have to say the test run did exceed my expectations - it just works! Engine runs as it would have never had any trouble. At least for my case this was the solution. There is no visible mark to the liner, it looks as before.

So, I just gladly accepted the engine is back in order, installed it into the Aurora and made some nice flights last sunday. Kept the belly pan off, this will receive some more slots to allow the hot air behind cylinder head to escape. Still have to do the CG shift to the back, since I need somewhat too much down elevator during inverted flight. Nice plane! Flaps help to slow down for landing, mixed with little down elevator.

Looking forward to accumulate more flights with this beauty of a plane.

RE: MK Aurora 60 build - engine installation question
 

Dominik,

Well done on sorting out your engine woes and getting her up in the air!

On second thought, your final scheme is also reminiscent of both the Arrow and the original Deception.

Happy landings!

David

RE: MK Aurora 60 build - engine installation question
 

Well,

I have to admit during the Aurora build I was lucky to get an old german book about Pattern flying which has a nice Phoenix 7 plane on its cover. :)
This book was always somewhere around in my hopbby room. It even shows on one of the engine installation pics. Sometimes a good inspiration is just very welcome!

Dominik

RE: MK Aurora 60 build - engine installation question
 

Hey Dominik,
schön,dass der Hanno endlich läuft!!
Ist das eine bewegliche (schwingende) Motoraufhängung?Wenn ja würde ich den Krümmer teilen.Der bricht sonst schnell durch die Vibrationen.
Und so ein seltenes Stück ist sicher schwer zu kriegen.
Schöne Flüge noch.
Dein Achim

...sorry for cutting it short in german...

RE: MK Aurora 60 build - engine installation question
 

Hi Achim,

der Motor ist festgeschraubt. Das ist einfacher, aber natürlich etwas lauter. Mein Metterhausen Quasar mit einem 61er Webra LS Heckauslass auf Gummielementen ist leiser.

English: No flexible engine installation, engine bolted down to the wood rails. This may create some more noise, but it keeps things simple.

Dominik

RE: MK Aurora 60 build - engine installation question
 

ok so you might be save with that header.

Achim

RE: MK Aurora 60 build - engine installation question
 

Some nice flights over the last 10 days with the Hanno-powered Aurora.

The more flights the engine gets, the better it does. Had to adjust the low end needle excenter today towards little more rich. Instant throttle response, it was little hesitating before to pick up rpm. Reliable idle.

I will have to take little care to keep the fuelproof paint at the joining area between belly pan and fuselage in place, as vibration tries rubs it off there.

Plane is fast with the 12x10 prop, but has lots of power for large cuban eights. Just a pleasure!

RE: MK Aurora 60 build - engine installation question
 

Fantastic!! Your plane looks great and it's Awesome to hear she flies as good as she looks...[8D]

The Hanno is such a wonderful engine!! I'd personally suggest keeping it on the rich side forever, wiping of a little oil isn't that big of a deal and I personally think it will ensure longevity of your engine...These things produce enough power that you don't need to squeeze every ounce of performance out of them (in my opinion)...;)

Have Fun...

Chuck

RE: MK Aurora 60 build - engine installation question
 

Thanks!

The plane is around 8lbs ready to fly, so plenty of power is avialable.
For sure I will treat that nice Hanno Special engine carefully.