3W Bearcat with Moki 300
11-18-2015, 04:56 AM
#126
Detlef,
I would just put the cowl flaps in a permanent open position for the ones on the top and then hinge the bottom ones so that they will close if you ever have to belly land the plane.
If you could spring load the lower flaps so they have some tension on them they won't blow closed with the airflow in flight.
I would also highly recommend that you baffle the engine so it gets as much airflow going thru the cylinders.
I would just put the cowl flaps in a permanent open position for the ones on the top and then hinge the bottom ones so that they will close if you ever have to belly land the plane.
If you could spring load the lower flaps so they have some tension on them they won't blow closed with the airflow in flight.
I would also highly recommend that you baffle the engine so it gets as much airflow going thru the cylinders.
Last edited by Greg Wright; 11-18-2015 at 05:07 AM.
11-18-2015, 02:28 PM
#127
Detlef,
I would just put the cowl flaps in a permanent open position for the ones on the top and then hinge the bottom ones so that they will close if you ever have to belly land the plane.
If you could spring load the lower flaps so they have some tension on them they won't blow closed with the airflow in flight.
I would also highly recommend that you baffle the engine so it gets as much airflow going thru the cylinders.
I would just put the cowl flaps in a permanent open position for the ones on the top and then hinge the bottom ones so that they will close if you ever have to belly land the plane.
If you could spring load the lower flaps so they have some tension on them they won't blow closed with the airflow in flight.
I would also highly recommend that you baffle the engine so it gets as much airflow going thru the cylinders.
Greg,
of course the engine will be baffled inside the cowling. The 250 before was, and the baffling only needs a little care to fit the 300.
You are 100% right to recommend this for any radial, and especially the moki doesnt have to much cooling surface. It NEEDS a well working cooling System!
In an average Bearcat there is not too much area for hot air to escape, and without baffling you will kill the engine sooner or later, but you will.
11-22-2015, 01:00 PM
#128
Yesterday I hang the BC on the cieling to check the CG when completely assembled.
The last things to put in are batteries and some other items.
Can somebody tell me where the best CG for the bearcat should be?
3W says 190 mm behind the leading edge, measured at the fuselage side.
It seems pretty much forward; what do you guys fly?
At the moment the CG is a bit forward of the cabin covers front edge ( Picture 2)
The last things to put in are batteries and some other items.
Can somebody tell me where the best CG for the bearcat should be?
3W says 190 mm behind the leading edge, measured at the fuselage side.
It seems pretty much forward; what do you guys fly?
At the moment the CG is a bit forward of the cabin covers front edge ( Picture 2)
11-22-2015, 05:47 PM
#129
Thread Starter
Hi Detlef, I have my CG at 190mm (7.5 inches) as 3W says. It seems like a good starting point, but I haven't tried any other position. I've heard many other also flying with the CG at 190mm. Rob
12-28-2015, 01:20 AM
#131
HI Rob,
what total wet weight did your Bearcat have in the end? Did you spend any extras like a smoke system?
I spent her a nice tail gear and some serious reinforcements of the tail fuselage.
Both together neutralized the heavier engine, so my CG did not change too much.
Total dry weight is now at 23,2 kg with, and 22,7 kg without scale Cockpit.
what total wet weight did your Bearcat have in the end? Did you spend any extras like a smoke system?
I spent her a nice tail gear and some serious reinforcements of the tail fuselage.
Both together neutralized the heavier engine, so my CG did not change too much.
Total dry weight is now at 23,2 kg with, and 22,7 kg without scale Cockpit.
12-28-2015, 04:12 AM
#133
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An amazingly nice tail wheel arrangement Detlef.
You also mention the dry weight which is interesting for me getting closer to finalizing my 3W Bearcat.
I am battling with the scale cockpit for the moment and would really appreciate some sample pictures of yours if possible.
Many thanks!
KR
Frode
You also mention the dry weight which is interesting for me getting closer to finalizing my 3W Bearcat.
I am battling with the scale cockpit for the moment and would really appreciate some sample pictures of yours if possible.
Many thanks!
KR
Frode
12-28-2015, 05:33 AM
#134
Thread Starter
Hi Detlef, My final weight was about 23,5 kg (~52 lbs.) A bit heavier then I wanted... So I decided not to go with smoke. I also had to really strengthen the landing gear area to handle the weight. rob
12-30-2015, 12:29 PM
#135
An amazingly nice tail wheel arrangement Detlef.
You also mention the dry weight which is interesting for me getting closer to finalizing my 3W Bearcat.
I am battling with the scale cockpit for the moment and would really appreciate some sample pictures of yours if possible.
Many thanks!
KR
Frode
You also mention the dry weight which is interesting for me getting closer to finalizing my 3W Bearcat.
I am battling with the scale cockpit for the moment and would really appreciate some sample pictures of yours if possible.
Many thanks!
KR
Frode
Hi Frode,
some pics for you
12-31-2015, 11:56 PM
#140
01-01-2016, 04:08 AM
#141
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Hi Rob, Detlif, first of all Happy New year. And all the best for 2016.
Many thanks on your comps,, yes she is in my Tiger chrome, the gear is from Centaury Jet, articulating scalish gear,, the do need a bit of tweaking but work fine.
Power is a 3w 200b2,,plenty of power!!! c g as plan.
Cheers Graham
Many thanks on your comps,, yes she is in my Tiger chrome, the gear is from Centaury Jet, articulating scalish gear,, the do need a bit of tweaking but work fine.
Power is a 3w 200b2,,plenty of power!!! c g as plan.
Cheers Graham
01-02-2016, 10:11 AM
#142
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Many thanks to both Detlef and Rob for giving nice details on the cockpit. This is very helpful.
Detlef - I can see you have implemented the scale sliding canopy. The tube going backwards from the seat back - is that an air cylinder for the canopy mechanism?
KR
Frode
Detlef - I can see you have implemented the scale sliding canopy. The tube going backwards from the seat back - is that an air cylinder for the canopy mechanism?
KR
Frode
02-29-2016, 01:03 PM
#144
Tailwheel, still factory clean ( no weathering yet).
Engine Installation. Sorry for much too light colurs of my pocket cam, the tone is muss deeper green and blue in fact.
And- of course moving cowl flaps on the upper and bottom fuselage. Couldnt resist..
03-05-2016, 09:56 AM
#146
Rob,
it is no extension, it is a custom made hub with a central thread.
I dislike the 6-bolts attachment for several reasons, so I make such hubs for all of my engines.
In case you want to use a compund prop (like Solo), is is necessary either way.
The back side of the metal prop hub has received the same riffle design, so there will be no slippage between prop and hub, no matter what the engine does.
it is no extension, it is a custom made hub with a central thread.
I dislike the 6-bolts attachment for several reasons, so I make such hubs for all of my engines.
In case you want to use a compund prop (like Solo), is is necessary either way.
The back side of the metal prop hub has received the same riffle design, so there will be no slippage between prop and hub, no matter what the engine does.
Last edited by Detlef Kunkel; 03-05-2016 at 10:02 AM.
03-13-2016, 11:43 AM
#150
Thread Starter
I'm using a prop hub adapter and CF blades from SL-Propeller in Germany. Solo didn't make an adapter for Moki 300 or the CF blades. SL-Prop's quality and service are excellent. The hub isn't perfectly scale but looks really nice on the Bearcat.
