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Old 01-19-2011, 11:02 AM   #1001
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Re: 58% Modellbau Pitts Build Thread - BBT


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That is exactly how my quad is baffled, at the end of a flight I can hold my hands on the jugs and not get burnt. Looks awesome Trevor.
What's your set-up???? Which quad????
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Old 01-19-2011, 11:43 AM   #1002
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Re: 58% Modellbau Pitts Build Thread - BBT

Hey Trev, how's things? Sorry if this has been covered already. Have you ever built a lip around the exit hole in the cowl to create and more functional low pressure area? Thanks Brad.
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Old 01-19-2011, 07:00 PM   #1003
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Re: 58% Modellbau Pitts Build Thread - BBT

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Hey Trev, how's things? Sorry if this has been covered already. Have you ever built a lip around the exit hole in the cowl to create and more functional low pressure area? Thanks Brad.
Hey Brad! Good to hear from you!

I've honestly never had to do it because I've always been able to get the 3:1 ratio, but there's a lot of good detail on Flying Giants about how effective it is. I've also read where I guy put shredded paper inside the cowl and then turned on his leaf blower and simulated air flowing down along the bottom of the fuse and the vacuum pulled all the paper out of the cowl!

This goes to show you the level of detail and engineering Exclusiv Modellbau put into this kit... check out the lip they put on the opening of the bottom of the cowl on this Pitts!
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Old 01-19-2011, 08:22 PM   #1004
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Re: 58% Modellbau Pitts Build Thread - BBT

Hello Trevor,
I have been following your build and have learned a lot from it. One thing that I have become interested in is wireless telemetry. You may already know about it but here is a site for monitering engine temps: http://www.eagletreesystems.com/Revi...gullreview.pdf
Thank you for all your info.
Charles
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Old 01-19-2011, 08:35 PM   #1005
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Re: 58% Modellbau Pitts Build Thread - BBT

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What's your set-up???? Which quad????
I have a 3w212 on a Giant Composite models 44% Extra. Had it bout 5 years now, runs like a watch. 5800-5900rpm on a Menz 34/10 and stock muffs. Amazing amount of torque.
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Old 01-19-2011, 09:51 PM   #1006
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Re: 58% Modellbau Pitts Build Thread - BBT

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I have a 3w212 on a Giant Composite models 44% Extra. Had it bout 5 years now, runs like a watch. 5800-5900rpm on a Menz 34/10 and stock muffs. Amazing amount of torque.
Very cool!! I heard that those 3W212's were powerful and those are great numbers! I'm going to start with the Menz 34x12, but because my 220 is on pipes, I'm told it will run on a 36x12. Time will tell! After a few runs, I'll invest in a bunch of props and am leaning towards the JC Props that AircraftInternational is selling - perhaps a 34x14!!

Any videos of the Extra???

Cheers

T
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Old 01-19-2011, 09:56 PM   #1007
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Re: 58% Modellbau Pitts Build Thread - BBT

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Originally Posted by HarvardsRule View Post
Hello Trevor,
I have been following your build and have learned a lot from it. One thing that I have become interested in is wireless telemetry. You may already know about it but here is a site for monitering engine temps: http://www.eagletreesystems.com/Revi...gullreview.pdf
Thank you for all your info.
Charles

Yes - I have an older Eagletree and still use in on my electrics and used it extensively last year on my Radio system to understand the current draw from today's big servos... turns out that even a 43% doesn't run much current through the Rx and as a result I sold all my power-expanders, etc.

The new Eagletrees are nice and have lots more options!

Do you use yours much?
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Old 01-19-2011, 10:21 PM   #1008
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Re: 58% Modellbau Pitts Build Thread - BBT

Hello Trevor,
I just retired and finally have the time to get into this great hobby. I just aquired my wings last fall. I, as yet, don't have all the equipment I want to
use in the models. Especialy the accessories I mentioned. Although I don't have my pilots licence I am fortunate to have friends who own their own AC.
One asked me to go with him to Oshkosh last year. Got to meet Mike from ICE PILOTS and sit in the seat of their DC-3, 'Summer Wages'.
On the way back we stopped off at Steinbach, Manitoba and went for a ride
in Harvs' Air Services' Pitts S2. So, there I have an interest in your project.
Life is good!! I wish you success in your endeavors.
Also, Thank you for telling me of your experience with that equipment.
Cheers.....Charles
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Old 01-20-2011, 04:10 AM   #1009
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Re: 58% Modellbau Pitts Build Thread - BBT

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On the way back we stopped off at Steinbach, Manitoba and went for a ride
in Harvs' Air Services' Pitts S2. So, there I have an interest in your project.
Sweet!!!!

Since this is a Pitts Thread, do you have any pictures of the S2 you were in?? How did it fly????
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Old 01-20-2011, 07:10 AM   #1010
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Re: 58% Modellbau Pitts Build Thread - BBT

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Jim.. that little hole on the firewall will soon be covered over with clear Monokote to seal it off.

So where does the air go? - the only place it can go is down between the cylinder head fins - the rest will be completely sealed off. As it passes down, through the fins (at higher speed than it entered into the cowl) it cools off the cylinder head - top and bottom. The hot air then exits out the opening in the bottom of the cowl.

The air freely goes through the fins because the exit hole (at the bottom of the cowl) is right now about 4 times larger than the area between the fins. Because of this ratio, there's a negative pressure created underneath the motor that pulls the cold air that enters the cowl through the fins.

Like I said in previous posts, this is the tried and proven method for cooling quads and it's almost too efficient. On my Mintor220, if it's below freezing and I'm doing an IMAC routine, it's actually tough to keep the motor warm... It forces me to do a bit of 3D after a sequence to keep the engine warm!!!! On a 30 degree day, flying IMAC and 3D hard with my Mintor220/43% Carden, I've only seen the back cylinders hit 170 degrees, which is almost too cool. I'm now experimenting with having bypass holes (or a damper to open or close) so that I can adjust the cooling depending on ambient temps

T
OK Trev,

I guess that is why I am an Electronics Tech and NOT and AME!

Your explanation makes sense to me.

DA Kid APPROVED!

Carry-on!
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