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DHC6-300 4-bladed props.


haseen

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Dear:

1. Where is the performance data for 4-bladed prop twin otter?

2. Is max prop rpm same both for 3-bladed and 4-bladed prop engines?

2. Where can I find repaints of 4-bladed prop twin otter?

Regards,

Haseen Ahmad

Bangladesh.

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The performance between the 3 bladed and 4 bladed are very much the same

Prop RPM is also the same.

The reason for the 4 bladed propeller is noise reduction.

You can find alot of repaints here: http://forum.aerosoft.com/index.php?/files/category/47-twin-otter-extended-repaints/

But since the 4 bladed Twin Otter isn´t very common, I doubt that there are many repaints around.

Finn

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Thanks for replying Finn. As far as I know being an Avionics Engineer, increased no. of blades equates to lower prop rpm which contributes in reducing the prop noise.

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There is nothing in our manuals, or other sources that indicates that RPM for the 4 blade props are lower.

The main reason for the noise reduction is that the propeller diameter is lower on the 4 bladed prop than on the 3 bladed, thus the periphical speed is lower at the blade tips.

This can also be seen if You go to external view and compare the two versions.

Finn

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