JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

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witor
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JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

Post by witor » Sat Jul 17, 2021 8:28 pm

I would like to compare JS3 and Ventus 3 at a lower wing loading. Could someone post a screenshot of Ventus 3 polar at 50 kg/m^2 and mc set for speed of 200 km/h?

Thanks in advance.

6266
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Re: JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

Post by 6266 » Sat Jul 17, 2021 9:21 pm

Like this? Exactly 50 kg is impossible (for me ;-) )
Ventus.png
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witor
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Re: JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

Post by witor » Sat Jul 17, 2021 9:24 pm

Thanks that's great. If you switch off the fixed balast it might be possible to get it to 50.

Anyway this is interesting... Ventus 3 is quite a bit better at this wing loading compared to JS3. I wasn't expecting that. JS3 polar for comparison:
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wickid
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Re: JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

Post by wickid » Sat Jul 17, 2021 10:10 pm

Ventus has more wing area. So at the same wingloading it can fly at a smaller angle of attack (gets the lift from the wing area). That gives less drag. Also the Ventus is heavier at the same wingload. That means the reynoldsnumber is also different giving less drag.

At max loading the JS3 is better because it has a bigger wingloading.
PH-1504, KOE

6266
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Re: JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

Post by 6266 » Sat Jul 17, 2021 10:44 pm

witor wrote:
Sat Jul 17, 2021 9:24 pm
Thanks that's great. If you switch off the fixed balast it might be possible to get it to 50.
No, of course I tried ...
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witor
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Re: JS3 - 18 vs Ventus 3 - 18 at 50kg/m^2 at 200 km/h

Post by witor » Sat Jul 17, 2021 10:54 pm

No worries. Thanks again for the screenshot. I got what I needed to confirm my suspicion that Ventus at lower wing loading is better.

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