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Author Topic: Bengs Modellbau 'Karl'  (Read 12187 times)

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Re: Bengs Modellbau 'Karl'
« Reply #45 on: May 09, 2020, 04:11:35 pm »
Bonjour Raphael,

Thank you for the 'heads up', i am not familiar with uploading videos on youtube.

I love your picture with the little steam boat pulling you in the dinghy BTW, you must be a real craftsman to make such magnificent models.

Did your friend try increasing the strength of the inlet valve spring? it made a big difference to how mine runs, maybe this would help him?

Kind regards and thanks

Ade
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Re: Bengs Modellbau 'Karl'
« Reply #46 on: May 09, 2020, 07:55:20 pm »
Runs great, Ade. Looks great, too...!!!


Nice work..!!


Gil
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Re: Bengs Modellbau 'Karl'
« Reply #47 on: May 09, 2020, 11:03:06 pm »
Great to see it running already  8)
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Nick

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Re: Bengs Modellbau 'Karl'
« Reply #48 on: May 10, 2020, 12:22:48 pm »
Thanks Nick and Gil  :D

As if i did not have enough brass splinters in my hands, i had a go at making a new carb today with a variable size venturi so i could get a nice speed when not in hit and miss mode.  Funny enough i was sipping coffee and thinking of a plan and fuel started dripping from the sight glass on the tank, well no big deal it was coming off anyway, but it turned out the piece of perspex supplied for the sight glass melts in petrol...very good!  lucky my mate had a sheet of 2mm glass so i could make a new sight glass.

Once the sight glass was fixed i got back to plan A and started of by making a throttle slide and needle



Then a stand alone venturi and fuel tank mount/fuel pick up



The idea being the venturi as an assy. will be easily removable from the carb body to make mods easier



Next came a complete new carb body and refitting back to the engine for test



It suprisingly worked pretty well considering the needle taper was just a guess



I could find a nice off governor speed and then turn on the governor and have it run all without adjusting the mixture needle.  Just got to think of a method of adjusting the slide without holding it with my poor splinter infested fingers  ;D

Ade
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Re: Bengs Modellbau 'Karl'
« Reply #49 on: May 10, 2020, 01:12:42 pm »
Bonjour Ade,
Great work indeed ! Important warning for you : my friend Max who has made his karl before you has had recently a very bad surprise.
The transparent porthole of the gas tank is not made of glass and the gas SP95 with a drop of 2 stroke oil he put in has slowly dissolved it  :( 
He has discovered this issue late because he does not use his engine frequently and keeps the tank dry when not in demonstration.
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Raphaël, Membre du Modèle Yacht Club de Paris : http://mycparis.fr/
Membre de l'Offshore Club de Paris: http://site-ocparis.wifeo.com/
Youtube : https://www.youtube.com/rhavrane

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Re: Bengs Modellbau 'Karl'
« Reply #50 on: May 12, 2020, 05:19:46 am »
That's a great engine you've got there Ade.

Best of luck with your next build.

Regards Trevor (eec1910).
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Re: Bengs Modellbau 'Karl'
« Reply #51 on: May 12, 2020, 05:22:36 am »
Quote from: eec1910 on May 12, 2020, 05:19:46 am
That's a great engine you've got there Ade.

Best of luck with your next build.

Regards Trevor (eec1910).

Thanks Trevor  :D

Is the M91 ok now?

Best wishes
Ade
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Re: Bengs Modellbau 'Karl'
« Reply #52 on: May 12, 2020, 05:40:45 am »
Hello Ade,

The M91 is running fine on some temporary governor springs,new ones on order from China

when they arrive I will send you couple if you want ?.

Cheers Trevor.
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Re: Bengs Modellbau 'Karl'
« Reply #53 on: May 12, 2020, 07:00:42 am »
Quote from: eec1910 on May 12, 2020, 05:40:45 am
Hello Ade,

The M91 is running fine on some temporary governor springs,new ones on order from China

when they arrive I will send you couple if you want ?.

Cheers Trevor.

If you have 2 spare that would be nice, thanks.

Cheers
Ade
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Re: Bengs Modellbau 'Karl'
« Reply #54 on: May 17, 2020, 01:36:35 pm »
Karl is finally finished, new crank made, carb finished and a muffler.

Here is a rather poor video of it running, the sound is a bit 'intense' as you can probably tell making videos is not one of my hobbies.



A big thank you to all who followed this thread  ;D

Kind regards
Ade
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Re: Bengs Modellbau 'Karl'
« Reply #55 on: May 17, 2020, 01:59:11 pm »
Bonjour Adrian,
Congratulations ! I envy your skillness because I am not able to do the same.
Now, wht will be your next project  ;) ?
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Raphaël, Membre du Modèle Yacht Club de Paris : http://mycparis.fr/
Membre de l'Offshore Club de Paris: http://site-ocparis.wifeo.com/
Youtube : https://www.youtube.com/rhavrane

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Re: Bengs Modellbau 'Karl'
« Reply #56 on: May 17, 2020, 02:38:36 pm »
Well done on your final success and beating the problems into submission .
You should be very pleased with your result .

Cheers
Dennis
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Re: Bengs Modellbau 'Karl'
« Reply #57 on: May 17, 2020, 06:14:33 pm »
Very nice engine Ade, I hope you'll send a picture of this into Gil next month as I would love to vote for this as "Engine of the Month", would look great up at the top of the forum  ;)
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Nick

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Re: Bengs Modellbau 'Karl'
« Reply #58 on: May 18, 2020, 03:13:44 am »
Quote from: Raphael on May 17, 2020, 01:59:11 pm
Bonjour Adrian,
Congratulations ! I envy your skillness because I am not able to do the same.
Now, wht will be your next project  ;) ?

Bonjour Raphael,
I'm not sure what to make next, i really enjoyed making this engine, maybe a 'Domestic' from Bob Herder but it is expensive with the shipping.
Kind regards
Ade
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Re: Bengs Modellbau 'Karl'
« Reply #59 on: May 18, 2020, 03:18:25 am »
Quote from: Scorpion2nz on May 17, 2020, 02:38:36 pm
Well done on your final success and beating the problems into submission .
You should be very pleased with your result .

Cheers
Dennis

Hi Dennis,
A big thank you for pointing me in the direction of the taper pins.  I made a test piece still with the brass and solder but with as much thickness as i had room for and of course the taper pin driven in with Loctite and it was much stronger so i went ahead and made a new crank, so far so good  ;D
Kind regards
Ade
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