Monday, 25 February 2019

Crow-aware adaptive elevator trim

Crow brakes are an essential aid on modern F3X ships. However in order maintain neutral pitch trim a compensation curve is required, and this can be a pain to adjust.

In this post, I describe an adaptive trim system which allows the curve to be adjusted transparently whilst flying the model, using nothing more than the regular elevator trim lever.

Saturday, 9 February 2019

A 3D printed CG scale

How do you measure the CG of your model? Very likely, you'll be balancing the model over a pair of pivoting arms, or - if you're feeling lazy - your fingertips. Low cost yes, but not very convenient or accurate. Well, now there's a better way...

Monday, 26 November 2018

A 3D-printed case for the RX6R

FrSky's latest RX6R receiver is tiny, and offers excellent range. It's perfect for F3F models with pencil thin fuselages like the Pitbull and Stribog - except for one problem: it comes with a flimsy cardboard wrapper. That may be okay for a foamie, but not for more serious use.

Tuesday, 16 October 2018

Ahi 1.0: an OpenTx template for aerobatic slopers

I've just added a new setup to my library of soaring templates. It's for 4-channel aerobatic slope soarers like the Ahi, Phase 6, Voltij etc.

Monday, 1 October 2018

Frsky RX6R - a tiny full range 6CH receiver

The FrSky RX6R sounds like the answer to a lot of pilots' prayers - a receiver small enough to fit in a Pitbull or Stribog without looking as if it's been jammed in with a hammer! What's more, the RX6R is claimed to offer 40% more range than X-series receivers. Sounds too good to be true? Let's find out... [note: updated 18 Oct 2018]

Saturday, 15 September 2018

Adaptable ballast spreadsheets, using array formulae

F3X pilots love ballast! However, ballast arrangements seem to get ever more complicated. Many F3F models have multiple pockets for wing ballast, optional joiner ballast, and choice of carbon or steel joiner. The problem is knowing how to distribute the ballast so as to minimise the impact on CG.

Photo magic at the Welsh Open

Here's a publicity shot by MKS, using two of my images. It shows Joel West winning the recent Welsh Open. I think their graphic designer has done a rather nice job!