|
|
Post by patmatgal on Mar 3, 2008 21:28:25 GMT 1
I`m looking to replace my prop (still can`t stop breaking `em). Yesterday I ended up getting an APC 10X4.7: APC because it seems recomended by enough people so that I should give it a shot, 10 because it`s the same length as the stock SC and 4.7 because the LHS had in stock. Haven`t tried it yet but does anyone have an idea of what I can expect? Assuming the length of the prop stays the same (10) then what is the trade off as the pitch decreases?
|
|
|
|
Post by l8again on Mar 3, 2008 22:09:50 GMT 1
|
|
jt01
Squadron leader
Posts: 166
|
Post by jt01 on Mar 4, 2008 2:21:11 GMT 1
With a 10x4.7 your motor will rev faster but the prop wont push much air. If you have a stock motor and NiMh battery you would be best to stick with the stock 10x8 prop. Think of it as a 10 speed bicycle. On a slight uphill grade if you were in first you would pedal you're a$$ off but not really go anywhere. In 10th it would be very strenuous to pedal and you would not get the maximum speed but in 5th or 6th you could pedal comfortably and maintain a good cruising speed.
hope this helps
Jim
|
|
|
|
Post by flydiver on Mar 4, 2008 4:06:45 GMT 1
Read the other article on props also: www.ampaviators.com/index.php?option=com_content&task=view&id=66&Itemid=27If you stayed with the same TYPE of prop (fat blade, slow fly) you could go to an 11x6 for a somewhat slower prop with more thrust. The 10x4.7 will seem slow, like Jim says, driving around in a gear too low without the ability to shift up. Electric motors have a fairly narrow band of optimal load at a given voltage/RPM. The 10x8 has been sorted out to work well with the stock system. Buy a bunch of props and/or get a prop saver. Do some reading in the [Prop] section for specifics. fly |
|
|
|
Post by patmatgal on Mar 5, 2008 0:46:38 GMT 1
Ok. Thanks much. As the length increases the thrust of the prop increases, and as the pitch decreases the thrust decreases but RPMs increase. Doesn`t look like I should expect too much out of the the 10X4.7, got 2 Cub replacements at another lhs though. Basically I should stick with a 10X8 though for what I want and have now ( stock motor to fly slow ) thanks everyone ps en.wikibooks.org/wiki/RC_Airplane/Propellers was really good |
|
