Mxfans 4 Leaves Dia 67mm P1.7 RC Boat Aluminum Alloy Propeller with 1/4" Shaft

Just what I needed.

Muy buena calidad y desempeño. Pasé de mi tener empuje con una propela de plástico a tener exceso de empuje con esta propela! Es genial

awesome prop.

Absolutely incredible craftsmanship. Needed a little rebalancing but thats to be expected when buting an RC prop for a boat as big as this thing is made for... i could not be happier with it

I'm putting this prop on a 50+ mph RC hydroplane. It's a 37" Lap-Cat II from the 70s that came with a nitro-fuel outboard engine. This is an electric inboard V-drive conversion. With a 2.5:1 overdrive gearbox, my shaft... and this prop... are turning 34,000 rpm. The last thing I need is an out of balance drivetrain. Imagine my disappointment when I discovered there's NOTHING balanced, true, centered, or symmetrical about this prop!!! My results, and how I fixed them... Pros: -If you want a large-diameter, 4-bladed, surface piercing prop, this is just about the only show available, at least here on Amazon. -It has at least the foundation of a good propeller, capable of high speeds and maximum power to the water. Cons: Geez, where do I start? -First, the blades aren't the same length. As shown in my first photo, setting the prop on a flat bench shows how far out they are. These have already been filed true, but they both had the same problem... one blade is longer than the other three. This poor casting quality will be an issue repeated ad-nauseum throughout my review. In my third photo you can see the flat face to the rear-facing trailing edge where I trimmed the blade back to match the others. -Next, the bore is out of spec... BADLY! Casting again... Whether it says 6.5mm or 5mm, neither one is what it actually is. Too small for a 6.5mm shaft, too big for a 5mm shaft. I had to press a brass sleeve in, then bore it back out by hand, since my drill press doesn't have a clamp. (FYI... wear gloves... I sliced a finger doing this.) -Have I mentioned the poor casting quality? Seems I remember doing that... anyways, the casting quality is AWFUL!!!! Jagged blade edges, REALLY rough hubs, out of round and off-center hubs, drive slots severely off-center and out of spec, shaft holes off-center, molding flash all over the place... ZERO post-production machining. In my first and third photos... see the little orange handled files? HOURS sitting in my shop, listening to an audiobook, hand-filing these props to balance, smooth, and center everything so it doesn't rip my hydroplane apart at 50+ miles an hour. The last photo... that hydroplane...1970s fiberglass Prather Lap-Cat II. If you want a great prop for not a lot of money, and have the time and patience to do a lot of by-hand work, this is your new prop. If you want something you can throw directly from the package to the boat and go play... DO NOT buy this prop!!!! It WILL destroy your boat unless you invest a lot of time and patience.

the only reason i give this a 1 star rating is i asked very directly if i could use this for my12hp nitromethane rc boat. this prop is fine for toys! this prop should NOT be used on anything that spins at 140,000 rpm. i cant put into words how lucky we were to not be injured when we used this prop. it tore itself apart, we never found the pieces. my rc boat was not so lucky. if you have a TOY... 5 star review. if you have a serious hobby, dont try to cut corners like i did. the only thing you will cut is your boat in half.

It is very well balanced smooth brass polished won't get wrong or disappoint. And no no one paid me for the review nor I'm associated to the vendor or Amazon

It works perfectly for a wheelbarrow inner tube.

Excellent product first class works perfectly very pleased powers my 4foot RC boat perfectly

I like

Great

J'ai eu beaucoup de succès sur un speed boat électrique de 65'' de longueur. Très bon.