Where the
numbers come from.
Every calculator is only as good as the catalogue underneath it. This page shows the whole catalogue and how strong the evidence is behind each entry, including the entries where the evidence is weak. Most tools do not show you this. That is the point.
A thrust figure can come from a bench, from a spec sheet, or from nothing but convention. Those are not the same thing, so they do not get the same label, and the weakest one is not hidden. The counts below are read from the live catalogue every time this page loads, so they cannot drift from what the tools actually use.
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The evidence badge reflects one thing only: whether a primary source exists. It never reflects a commercial relationship. A manufacturer who sends bench data gets the same badge rules as one who sends nothing, and a brand that pays commission gets the same badge rules as a brand that pays nothing.
We do not sell placement, ranking, or a better badge. Partnership and affiliate money buys none of those things.
Sorted by how much evidence backs each entry, strongest first. Where a source note exists it is shown as recorded. Where it does not, the row says so, and the counts above say how many.
| Component | Evidence | What backs it |
|---|
Gemfan sent static-bench data for four propellers (3, 5 and 10 inch) on 31 August 2026, the first propeller bench data PropDesk has had directly from a manufacturer.
There is no propeller family in the catalogue yet, so it is not a row above. It went into the accuracy check behind the calculator's thrust estimate, and the model was rebuilt around it. For 5-inch props the estimate is now within about 6% of the bench; hold a whole motor out of the fit and it is 7.5%. Over the full 4-to-11-inch range that becomes 9%, which is why the calculator shows 10%. Coverage is thinner elsewhere: between 5.5 and 10 inches there is no bench point at all, the two points at 10 inches carry that end of the range on their own, and below 3 inches nothing is validated yet.
A propeller family with its own evidence badges is planned. Until then, this is where that data is acknowledged.
Innov8tive Designs, who make Cobra motors, sent us the links to their bench sheets for the Cobra CM-2213 950Kv on 1 September 2026: 3S, full throttle range, three propellers. That is the Cobra row in the motor table, marked ✓ datasheet, and the sheets are on their site. It replaced an earlier Cobra entry, a 920Kv version that Innov8tive told us does not exist.