3W Bearcat with Moki 300
09-24-2023, 09:39 AM
#479
I was shooting for a September maiden.
Sorry my friend :-)
Sadly limited to half throttle as the front ball bearing is beginning to quit after roughly 75 -80 flights with the bBearcat I
More flights were not advisable, the engine needs a little rebuild first.
Not a big thing I hope.
We would have loved to have more flights on her, but the main goal is achieved.
Btw the landing gear with the long stroke oil damped suspension is performing great.
Last edited by Detlef Kunkel; 09-24-2023 at 09:45 AM.
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gow589 (09-24-2023)
09-25-2023, 02:21 AM
#481
My Feedback: (7)
I was shooting for a September maiden.
Sorry my friend :-)
Sadly limited to half throttle as the front ball bearing is beginning to quit after roughly 75 -80 flights with the bBearcat I
More flights were not advisable, the engine needs a little rebuild first.
Not a big thing I hope.
We would have loved to have more flights on her, but the main goal is achieved.
Btw the landing gear with the long stroke oil damped suspension is performing great.
Sorry my friend :-)
Sadly limited to half throttle as the front ball bearing is beginning to quit after roughly 75 -80 flights with the bBearcat I
More flights were not advisable, the engine needs a little rebuild first.
Not a big thing I hope.
We would have loved to have more flights on her, but the main goal is achieved.
Btw the landing gear with the long stroke oil damped suspension is performing great.
Again, congratulations!
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Detlef Kunkel (09-25-2023)
09-25-2023, 08:51 AM
#483
Thank you guys. :-)
Final weight with fuel to drip out when rolling is 24,92 kg, on a certified calibrated official scale.
Not with the scale sliding canopy cockpit, but with a simplified "only flying" cockpit ( 400 gr vs 1,3 kg with full pilot)
Doesnt matter at all in flight. You wouldn`t know from the video if I didn`t tell you.
You may know that we have regulations in Germany where above 25 kg live gets pretty complicated, so this limit is truly important.
The speed you see here is roughly what this plane does with a 250 radial on full throttle.
The 300 is pretty much faster, and the sound is absolutely incredible.
When you bank and dive in from 250 m height, you have the feeling that it eats up its own echo.
I hope the 300 is fine soon. But back in the air she will be in 2024, not this year
PS:
Some decent wheathering and exhaust smoke will follow this fall.
Last edited by Detlef Kunkel; 09-25-2023 at 08:53 AM.
09-25-2023, 09:07 AM
#484
Mitch,
Elevator is at the deepest spot ( trim tab) 1" up and 1 " down. depending on your taste , expo function and - most important- point of your C_G.
With 200 mm, this is MUCH throw. with 190, its pretty smooth and can be raised a bit
This is my big throw, I can ( via dual rate) switch to a slightly lower throw.
The BC has an elevator like a whale ...
Elevator is at the deepest spot ( trim tab) 1" up and 1 " down. depending on your taste , expo function and - most important- point of your C_G.
With 200 mm, this is MUCH throw. with 190, its pretty smooth and can be raised a bit
This is my big throw, I can ( via dual rate) switch to a slightly lower throw.
The BC has an elevator like a whale ...
09-26-2023, 01:55 AM
#485
My Feedback: (7)
Mitch,
Elevator is at the deepest spot ( trim tab) 1" up and 1 " down. depending on your taste , expo function and - most important- point of your C_G.
With 200 mm, this is MUCH throw. with 190, its pretty smooth and can be raised a bit
This is my big throw, I can ( via dual rate) switch to a slightly lower throw.
The BC has an elevator like a whale ...
Elevator is at the deepest spot ( trim tab) 1" up and 1 " down. depending on your taste , expo function and - most important- point of your C_G.
With 200 mm, this is MUCH throw. with 190, its pretty smooth and can be raised a bit
This is my big throw, I can ( via dual rate) switch to a slightly lower throw.
The BC has an elevator like a whale ...
09-26-2023, 07:45 AM
#486
09-29-2023, 01:33 AM
#487
My Feedback: (7)
I'm in a bit of a delay trying to work out some radio issues. In the mean time I'm working on the scale exhaust pipes. These are strictly decorative and DO NOT flow actual exhaust gasses.
They sit in the exhaust pans and have to be transparent to the hot cooling air coming out of the cowl. I made them out of thin wall brass tubing. Thin carbon tubes would be better but I couldn't find any online and did'n feel like making them from scratch - although that would probably only save about an ounce of weight. These two sets weight right at 3 ounces for both.
They still have to be painted black.
They sit in the exhaust pans and have to be transparent to the hot cooling air coming out of the cowl. I made them out of thin wall brass tubing. Thin carbon tubes would be better but I couldn't find any online and did'n feel like making them from scratch - although that would probably only save about an ounce of weight. These two sets weight right at 3 ounces for both.
They still have to be painted black.
09-29-2023, 07:00 AM
#488
[QUOTE=mitchilito;12784494]I'm in a bit of a delay trying to work out some radio issues. In the mean time I'm working on the scale exhaust pipes. These are strictly decorative and DO NOT flow actual exhaust gasses.
They sit in the exhaust pans and have to be transparent to the hot cooling air coming out of the cowl. I made them out of thin wall brass tubing. Thin carbon tubes would be better but I couldn't find any online and did'n feel like making them from scratch - although that would probably only save about an ounce of weight. These two sets weight right at 3 ounces for both.
Really cant afford that.
I am forced to make a new elevator in order to bring the CG a bit forward and save some weight to be able to fly a ramoser Vario Prop ( weighing a plus of 230 gr)
They sit in the exhaust pans and have to be transparent to the hot cooling air coming out of the cowl. I made them out of thin wall brass tubing. Thin carbon tubes would be better but I couldn't find any online and did'n feel like making them from scratch - although that would probably only save about an ounce of weight. These two sets weight right at 3 ounces for both.
Really cant afford that.
I am forced to make a new elevator in order to bring the CG a bit forward and save some weight to be able to fly a ramoser Vario Prop ( weighing a plus of 230 gr)
09-30-2023, 01:50 AM
#489
My Feedback: (7)
[QUOTE=Detlef Kunkel;12784506]
What didn't you like about the SL prop? I'm not familiar with the "Ramoser"
I'm in a bit of a delay trying to work out some radio issues. In the mean time I'm working on the scale exhaust pipes. These are strictly decorative and DO NOT flow actual exhaust gasses.
They sit in the exhaust pans and have to be transparent to the hot cooling air coming out of the cowl. I made them out of thin wall brass tubing. Thin carbon tubes would be better but I couldn't find any online and did'n feel like making them from scratch - although that would probably only save about an ounce of weight. These two sets weight right at 3 ounces for both.
Really cant afford that. Can't afford what, Detlef?
I am forced to make a new elevator in order to bring the CG a bit forward and save some weight to be able to fly a ramoser Vario Prop ( weighing a plus of 230 gr)
They sit in the exhaust pans and have to be transparent to the hot cooling air coming out of the cowl. I made them out of thin wall brass tubing. Thin carbon tubes would be better but I couldn't find any online and did'n feel like making them from scratch - although that would probably only save about an ounce of weight. These two sets weight right at 3 ounces for both.
Really cant afford that. Can't afford what, Detlef?
I am forced to make a new elevator in order to bring the CG a bit forward and save some weight to be able to fly a ramoser Vario Prop ( weighing a plus of 230 gr)
09-30-2023, 02:32 AM
#490
09-30-2023, 02:36 AM
#491
[QUOTE=mitchilito;12784555]
The SL is fine, as they use the Bearcat style correct shaped and twisted blades that I made for Sven in order for him to produce them.
Google Varioprop, they make extremely modern thin profiled blades with a high efficiency.
Would like to try that one, as my big heavy 2,68 m Trojan performed so well with that and the tiny Moki 180 and 23,5 kilogram of wheight.
Never thought it would go well like that.
Would suit the BC as well, but is 230 gr heavier.
At the moment, impossible
I will show a pic
The SL is fine, as they use the Bearcat style correct shaped and twisted blades that I made for Sven in order for him to produce them.
Google Varioprop, they make extremely modern thin profiled blades with a high efficiency.
Would like to try that one, as my big heavy 2,68 m Trojan performed so well with that and the tiny Moki 180 and 23,5 kilogram of wheight.
Never thought it would go well like that.
Would suit the BC as well, but is 230 gr heavier.
At the moment, impossible
I will show a pic
09-30-2023, 03:26 AM
#492
here we go.
Very thin profile. High twist.
Would be interesting how it performs ccompared to the really good SL / BC prop.
I can monitore rpm and airspeed, so there will be no secrets.
Very thin profile. High twist.
Would be interesting how it performs ccompared to the really good SL / BC prop.
I can monitore rpm and airspeed, so there will be no secrets.
Last edited by Detlef Kunkel; 09-30-2023 at 03:42 AM.
09-30-2023, 03:40 AM
#493
while I'm slaving away, my lazy 300 is taking a wellness vacation.
After about 75-80 flights on the BC I noticed a fair amount of play in the crankshaft. You could even hear a new sound that did not belong there.
Thts wy we made only 1 flight, and I limited it to half throttle. Was good to do so as it showed up now.
I hoped it was just a replacement of a rather non-expensive ball bearing, and it was true.
The engine is in extremely good condition except for the 2 main ball bearings. No significant wear anywhere.
Once I get it disassembled, I will implement some other changes.
We'll see if it works, if not - well, it's a lot of work to take it apart again. I hope that will not be necessary
After about 75-80 flights on the BC I noticed a fair amount of play in the crankshaft. You could even hear a new sound that did not belong there.
Thts wy we made only 1 flight, and I limited it to half throttle. Was good to do so as it showed up now.
I hoped it was just a replacement of a rather non-expensive ball bearing, and it was true.
The engine is in extremely good condition except for the 2 main ball bearings. No significant wear anywhere.
Once I get it disassembled, I will implement some other changes.
We'll see if it works, if not - well, it's a lot of work to take it apart again. I hope that will not be necessary
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SHANEC (09-30-2023)
10-01-2023, 02:28 AM
#494
My Feedback: (7)
That's a big project you have there. I doubt I'll ever get 75 flights on my bear cat. I just don't fly that much anymore. But it sure is fun to see the insides of one of these. THANKS!
As for the different prop, personally, I'm pretty sure I'm not going to need to go ANY faster than she's already going to be capable of. Both of our airplanes are going to be STUPID FAST as they are. And mine even a little faster
Keep those fun pictures coming!!
10-01-2023, 02:53 AM
#495
10-01-2023, 01:58 PM
#497
My Feedback: (7)
I would just LOVE to know how Rob"s bearcat is holding up etc!
Here is the ONLY run I ever did. My run stand was OBVIOUSLY not up to any extended full power runs. I will spend several run sessions out at the flying field prior to first flight. Also some vigorous taxi practice as well. I need to get very familiar with my pump system and mix.
10-05-2023, 06:41 AM
#498
My Feedback: (7)
Got the smoking pipes installed. A 3.5 ounce addition that is nearly transparent to cooling air out.
I used spray can flat black paint (in my airbrush). It would be quite easy to remove if I didn't like it - but I do.
You have to look close to see the exhaust pipes at all - just like on the full scale bear.
I used spray can flat black paint (in my airbrush). It would be quite easy to remove if I didn't like it - but I do.
You have to look close to see the exhaust pipes at all - just like on the full scale bear.
10-05-2023, 09:54 PM
#499
Nice work, absolutely.
Looking forward to see her taxi by and the in flight. What a beauty :-)
------
in between,
I ordered a list of spare parts for my 300 and that of a friend, who is going to run it in Bearcat 2, a close copy of mine. Same gear. Same engine.
He is going to maiden his BC next year. Paint scheme is the Denver 14.
Hopefuly, we can arrange to meet and fly side by side one day in 2024
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mitchilito (10-06-2023)
10-06-2023, 02:29 AM
#500
My Feedback: (7)
Nice work, absolutely.
Looking forward to see her taxi by and the in flight. What a beauty :-)
------
in between,
I ordered a list of spare parts for my 300 and that of a friend, who is going to run it in Bearcat 2, a close copy of mine. Same gear. Same engine.
He is going to maiden his BC next year. Paint scheme is the Denver 14.
Hopefuly, we can arrange to meet and fly side by side one day in 2024
Looking forward to see her taxi by and the in flight. What a beauty :-)
------
in between,
I ordered a list of spare parts for my 300 and that of a friend, who is going to run it in Bearcat 2, a close copy of mine. Same gear. Same engine.
He is going to maiden his BC next year. Paint scheme is the Denver 14.
Hopefuly, we can arrange to meet and fly side by side one day in 2024
What kind of spare parts would you want to keep around for you Mokis, just out of curiosity? Only thing I can think of is exhaust pushrods - but I'm hoping reaming exhaust guides and oiling will fix that problem.
Any your two bearcats are going to be the stars of the show wherever you go, that's for sure.
Last edited by mitchilito; 10-06-2023 at 10:34 AM.