3d Printing Service
Printing 3d Forum
Started by HowDoIfly, Tuesday,July 09, 2013, 13:41:34
Quote from: Hands0n on Friday,July 12, 2013, 07:56:07 They may very well be the next great world economy but my other experiences with Chinese sellers has put me off completely. I only use them as a very last resort. It costs substantially more to deal with UK based sellers but it';s preferable to the inevitable total loss situation with off shore sellers where you have zero legal back up should you need it. But still you have to keep your wits about you. EBay and Amazon are now "infested" with them, even posing as UK sellers making it impossible to filter out.
Quote from: barneyg on Friday,July 12, 2013, 08:09:26 I dont blame you ... on the other hand I think the UK sellers need a kick in the pants ... I shouldn';t have to pay a 100% markup to get something from a UK seller compared to a Chinese one. Or how exactly is it I can get something shipped internationally from Hong Kong in about 2 weeks and pay a quarter of the price in shipping than a UK company charges (admittedly it usually arrives somewhat faster but really costing 4 times as much ?)
QuoteEBay and PayPal didn';t want to know when I ran into my issue with a Chinese seller. The "buyer protections" only apply if the seller is in the UK (and I think Germany).
Quote from: flybywire on Friday,November 08, 2013, 15:41:48 A happy ending perhaps? I think cheap motors are ok, I';ve bought plenty of HK/Turnigy';s finest (or not). I only replaced ones that got hot to the touch. Just in case, as they were only about £8 ea. THey can ';feel'; slightly different in terms of free play & stuff, as oposed to say Torqpower or Axi etc.Just remembered, I had as et of 4 RCTimer motors 2215 or some such, they sounded awful, but seemed to work ok. Ebay';d them in the end, sure they';re still propelling something or other around the sky!
Quote from: HowDoIfly on Friday,July 12, 2013, 01:28:13 I admit, I don';t understand the second number (something to do with pitch angle?) but the first relates to length in inches, right?
QuotePitch is defined as "the distance a propeller would move in one revolution if it were moving through a soft solid, like a screw through wood." For example, a 21-pitch propeller would move forward 21 inches in one revolution.Think of a propeller as you would a car';s axle ratio. The lower the ratio, the more pulling power from a standstill. The same is true with a prop. The lower the pitch, the better your hole-shot. However, this comes at a price: top speed. The lower pitch makes the engine reach maximum rpm at slower speeds.Conversely, a higher pitch will deliver greater top speeds, but slower acceleration. Be aware that lower-horsepower engines can bog down if fitted with a propeller with too high a pitch and diameter, and that can wear heavily on internal engine parts.
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