|Jan 13, 2015, 11:02 AM|
Joined Jul 2014
A Process for Calculating Model Drag - Nicolai
The purpose of this white paper is to present a method on how to estimate the aerodynamics and performance of R/C aircraft models.
|Jan 19, 2015, 04:05 AM|
United Kingdom, England, Southampton
Joined Oct 2013
Nobody else has commented so I will.
1) There are one or two doubtful assumptions in that report.
2) Toy planes are so uncritical and there are so many variables in actual flying that the calculated results are likely to be nowhere near accurate.
3) Why do so many people (not you, you didn't create the report) waste their time on such stuff? I don't want to 'pick on' anyone so won't name names but you see similar pointless (pointless if they actually fly toy planes, if they don't why are they here?) stuff often in the 'Modelling Science' section. And I'm not 'anti-science', I was near enough a 'scientist' of sorts myself all my working life.
|Jan 19, 2015, 03:48 PM|
2) The paper is titled "ESTIMATING R/C MODEL AERODYNAMICS AND PERFORMANCE." The word estimate means it's not exact. It's a reasonable approximation based on what is known of the model, scaling laws, and empirical data. Though, some validation cases would definitely be a valuable addition to the paper.
3) Speak for yourself. Just because you don't find it useful doesn't mean it's not useful to someone else. Actually, if you find something to be pointless, there's absolutely no reason for you to mention it at all. Just move on.
|Jan 19, 2015, 08:37 PM|
R/C models typically
have wing loadings of 1-3 lb/ft2 whereas the full scale airplanes are greater than 10
(Cessna 172 is 12.6 lb/ft2).
The article obviously includes a lot of data-
however I noted the comparative info shown here has as it's lower point a value double many performance type low speed models
In fact - a value of 6 OUNCES per square foot is not uncommon.
Noting this, I wondered how well the rest of the info applies to models having these lower loadings
My own ventures into this area show that the performance drops off at a extremely high rate as size in wing loadings around 1-2 ounces is reduced .
being a hands on guy, the lack of published data was not that important but I looked -and I saw none There my be some new work now -
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