Stock up on these props when they are in available. They go out of stock pretty quick, then it's a 6 month wait for them to come back. They are a direct replacement to the Kyosho Airium series, as well as the Tex line of warbirds. They are also the same prop that fits the Freewing B-17, normal rotation.
They also fit, without mods, any of the FMS 800mm series of warbirds that require a three blade prop. When used on the FMS planes, they actually provide a little more thrust than the stock props. I've also used them with success on the J-Power 1000mm P-38.
Yes, they are kind of fragile, but not overly so. Would you rather break a prop, or bend a motor shaft, or worse? At $1.50 each, you can afford to snap a few blades. Any place else you find these props charges ~$4.00 to 5.00 for them, so this is a bargain.
Highly recommended for any plane that uses a 7X6 propeller, with a 3mm shaft.Very weak on ground contact. I boiled them 10min. After that, they are much more flexible.Ordered these for the BF109 and Spitfire IX 650mm from HK. These are a direct replacement. They're even more straight than the originals. Great value!was no stock when i ordered went on backorder so had to wait a while couldn't find them anywhere else for 650mm spitfire wouldn't have bought it if i knew it was this difficult to get the blades good quality but prone to break on landing awesome price and worth the wait just not the hassle7X6, motor axis hole 3mm
a little bit softer
good to use for other planes if they need enough thrust with 3 blades.