Isn’t that an old pitot tube? I see it on all older planes.
Venturi tube vacuum generator(s) (often come in pairs).
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So basically it is to generate vacuum to operate gyroscopic instruments?
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Correct. Much simpler than a pump but subject to icing/clogging and the instruments tend to start working properly only after takeoff. 
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Thank you! I haven’t really noticed those vacuum generators on any other vintage aircraft.
Can you suggest where I might look?
Thanks! I’ve still got a lot to learn…
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Mostly small vintage GA aircraft like Pipers, some Taylorcraft etc. or very old C172s. Sometimes you find a Venturi tube (usually on the belly with a hose attached to one side) on bigger and not so old, suction pump-equipped planes, that would be the “pilot relief tube”.
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Currently in the sim, I think Cessna 140, Cessna 170b, WACO, Ju52 and maybe Electra (not sure about that one) have it.
Anyone up for another conspiracy theory?
I found the following while doing a little more digging into these venturi vacuum generators. Gotta love it!
Beginning of quote:
It is how they did chem-trails back in the day.
Fill the aux tanks with the poison of your choice and the air flowing in flows past a tube in that venturi pulling out the chemicals.
They removed them because a lot of those old planes, required you to hand prop the plane. Lots of pilots were getting doused with these poisons due to the air from the prop blowing into these tubes.
You can look it up but you won’t find a lot about it on the internet. The government has covered most of it up and those in the know have been threatened and had their families threatened and told if ever asked just say “Its a venturi to drive the vacuum system.”
If someone says that to you, you can be pretty sure they are part of the cover up.
End of quote. 
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I know it’s an older thread, but I’m exactly in this camp.
I was totally hooked on the 152, but I love this little aircraft even more due to is completely spartan offerings and classic vintage styling elements.
I love the challenges of the tail dragger takeoff and landing, too.
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It’s an oddly satisfying plane to fly. The attention to detail is stellar and you’re right about the deco inside. It’s very much a product of its time, 50’s kinda futuristic styling. Everything you need is there, keeping it simple with pure function in mind, very military in a way.
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Watched your videos. That’s one beautiful paint job, and obviously well cared for. Great ground handling skills on that rocky river bank, too!
Unfortunately, I am not among those who know how to do liveries but I’ll be among the first to download it after one of the many skilled programmers puts it up on Flightsim.to!
As a pilot of a real C170B, do you think landing the real thing is easier? I can’t get the Carenado to stop bouncing when I attempt to land on 2 wheels, even on the most gentle landings.
You’re likely going too fast…
But, to answer your question, yes, landing is easier in real life than the sim. The situational awareness of actual flying really helps “feel” the plane. Doesn’t mean simming isn’t fun, but actual flying is easier (assuming you have got your scan down and can “stay ahead” of the airplane (IOW, properly manage all the tasks required). That’s a lot harder in real life than it is in the sim, because you MUST do every step in real life, whereas in the sim you can skip steps and get through it ok. But, that’s what flight training is all about, making flight management second nature.).
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I found a pretty interesting “how to” video that seems to support the fact that even for the real-life professionals, “sticking” a landing in the C170 is not always that easy.
Neverthless if you’re interested in improving your technique, this is quite a fascinating and educational 14 minutes!
Flying the Cessna 170B - YouTube
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Granted I’m still learning, but if I go any slower then I have to make a 3 point landing in order to avoid catastrophe. Many people are having this same problem.
You’re able to make nice two wheel landings in the Carenado C170B?
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What a great looking plane! Do you mind me asking where these screenshots are from? Looks like a nice place to fly over! Thanks!
Yes, but it takes practice and setting up the plane properly. I found if I pull the power all the way out on landing it wants to fall to the ground and bounces, so I kept a little power in and let it settle slowly to the ground. You definitely want to minimize sink rate at flare or it’ll bounce.
Why are you trying two wheel instead of three wheel landing? The challenge?
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