[NSRCA-discussion] E Prop Question

[Ron Van Putte]

On Sep 4, 2006, at 2:36 PM, Park, Ihncheol wrote:

> I just looked up GP and Horizon dealer websites. Lowest pitch on  
> 15" dia is
> 7, 16" dia has 8 pitch as lowest available.
> You will probably increase the load on the power system  
> considerably by
> moving to 16x8E.
> Watt meter will show something.
> I am not very good at E stuffs, so other E experts should chime in  
> here.

Thanks for the input.

I actually had to limit the throttle to keep the power under 700  
watts (the motor's limit) when using the 14x8.5E prop.  I have an APC  
16x8E prop and will try that in flight after again limiting the  
throttle to avoid going over 700 watts.  I expect that the max  
throttle RPM for the 16x6E prop will be considerably under that for  
the 14x8.5, so the aircraft speed will probably be much lower as well.

Ron Van Putte
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ron  
> Van Putte
> Sent: Monday, September 04, 2006 11:17 AM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] E Prop Question
>
> I partially answered my own question.  I went back to the APC web  
> site and
> discovered more of the E props near the bottom of the list of  
> props.  What
> threw me off was that the props started out being listed by increasing
> diameter.  Then they just started adding props willy nilly at the  
> end.  I
> still couldn't find any low pitch 15'' or 16" props, although I  
> will get a
> 16x8E prop to try.  Any suggestions would be appreciated.
>
> Ron Van Putte
>
> On Sep 4, 2006, at 9:41 AM, Ron Van Putte wrote:
>
>> I have one of the 40-size BP Hobbies Fashion ARFs with a BP 3520-7
>> motor in it.  The battery pack is a 5-cell Apache with 3700 mah
>> capacity.  I currently have an APC 14x8.5 E prop on it, but would  
>> like
>> to use a larger E prop, with lower pitch to slow it down.  The prop
>> ground clearance on the Fashion is very large and I could even put a
>> 17" prop on it in a pinch.  Something like a 15x6 or 16x4 E prop  
>> would
>> be great to try, but I can't find anything.  I tried going to the APC
>> web site to see what else is available, but couldn't find any lower
>> pitch props.  However, the APC web site isn't up to date, because it
>> doesn't even list the 14x8.5 E prop that's on the airplane.  I need
>> the thinner prop hub that the E props have in order to get the  
>> prop on
>> the motor.  Any ideas?
>>
>> BTW, the Fashion is a VERY nice ARF.  I tried the Master class
>> maneuver schedule and was pleasantly surprised with how well it
>> performed, even though it was too fast.
>>
>> Ron Van Putte
>> _______________________________________________
>> NSRCA-discussion mailing list
>> NSRCA-discussion at lists.nsrca.org
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion