I have found the easiest and most readily available wood for the bowdrill is balsam fir. What have you used?
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Eew Tree, from about 2 feet off the ground, the outer layers below the bark up into the first few layers of branches, is the very best wood there is for making Bows of any kind, and they make super bow drills! Second would be Alaskan Yellow Spruce, especially done in thin layers and laminated into a still and strong bow, just make sure to have enough length to allow flex without cracking!
Dry Hemlock Fir works in my neck of the woods... Welcome to Survivalmonkey! Please introduce yourself by creating a post in the thread New Member Introductions
Hawaii Hau is a very useful plant. Wood is great for friction fire, floats, etc. Bark for cordage. So you could make your whole bow drill set out of this. Also used for the Samoan fire plow, so you don't even need cordage. Canoe Plants of Ancient Hawai`i: HAU Hibiscus tiliaceus - Wikipedia