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02-15-2011, 01:53 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

I've used that "How Fast Is It" Pitot tube speed...

I've used that "How Fast Is It" Pitot tube speed indicator on my models. One of them hit 113 Mph. It was surprising that on straight and level flights, one of my models checks out at 80 Mph, but in a...
02-13-2011, 02:22 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Something else here, for a propeller, the closer...

Something else here, for a propeller, the closer you get to the prop hub, the higher the pitch must be to maintain prop thrust. With sufficient blade pitch, it could get to a point where the pitch...
02-11-2011, 09:34 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

I've always been curious about those "squared...

I've always been curious about those "squared off" propellers used on the full scale turboprop airplanes. Just why are they squared off, more efficiency?, better performance? Or just simply a...
02-11-2011, 04:24 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Just a thought. It's well known that little of a...

Just a thought. It's well known that little of a propellers thrust and horsepower requirement comes from the inner diameter of that propeller. So, perhaps the only reason the inner portion of the...
02-10-2011, 12:30 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Interesting! Looks like depending on...

Interesting!

Looks like depending on circumstances, either the stationary prop, or the windmilling prop could have the lower drag. And, perhaps that could change from one to the other while the...
02-10-2011, 12:27 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

I've often wondered about that. I've got a model...

I've often wondered about that. I've got a model with a Hacker A50-16S motor, and 16X12 APC-E prop. It's interesting to put the model in a dive with the transmitter at about 30% throttle. Might be...
02-09-2011, 10:41 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

OK - - - - Now to start another issue! ...

OK - - - -
Now to start another issue!

Mathematically, which has more drag on a model in flight. A prop that is not turning? Or a prop that is windmilling? Bet you get a lot of comments on...
02-09-2011, 04:39 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

[QUOTE=NJSwede;784012]...and here's a model...

[QUOTE=NJSwede;784012]...and here's a model that's being praised for its flying characteristics all over this message board. I'd say about 40% of that prop is obstructed by the mock radial engine... ...
02-09-2011, 04:21 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Agreed, and simple to prove: Set up motocalc...

Agreed, and simple to prove:
Set up motocalc with a motor that turns a propeller at some specific
RPM. Then check the predicted thrust. Then reduce that prop diameter to 1/3 the original diameter,...
02-08-2011, 05:05 PM
Replies: 160
Views: 27,724
Posted By kyleservicetech

[QUOTE=57sailplane;783788] one of the biggest...

[QUOTE=57sailplane;783788]
one of the biggest problems i have found with motorcalc is that most manufacturers of motors and exspecially batteries and even esc's dont put out enough info to use this...
02-08-2011, 05:12 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

125 Mph on a 10X8 prop, that would require some...

125 Mph on a 10X8 prop, that would require some 15,000 RPM on that prop. :confused: (Per motocalc.com)
02-05-2011, 01:44 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Do you have a specific plane in mind? If so, let...

Do you have a specific plane in mind? If so, let us know, there is usually someone with that same exact model, along with how they powered it up. And, as indicated before, programs such as motocalc...
02-04-2011, 05:52 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Out of curiosity, did you check the RPM,...

Out of curiosity, did you check the RPM, current,volts,watts against motocalc?

I've found that at least for the Hacker line of outrunner motors those figures are pretty close, within 10% or so. ...
02-04-2011, 02:52 AM
Replies: 160
Views: 27,724
Posted By kyleservicetech

Agreed: www.motocalc.com...

Agreed:
www.motocalc.com (http://www.motocalc.com) does give an indication of the prop thrust versus flying speed of your power system setup. That program will quickly let you know that, for...
Showing results 1 to 14 of 14


 
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