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The Noosa Everglades

Posted by on Apr 23rd, 2013 in Photos | Comments Off

The Noosa Everglades

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Optimera – a multithreaded genetic algorithm library in C#

Posted by on Apr 13th, 2013 in Coding, Hydrology | Comments Off

Optimera – a multithreaded genetic algorithm library in C#

The problem of finding the global minimum or maximum of an arbitrary multi-parameter function, F(x, y, z, …), is a common one. The function F could represent the total yield of some system and you want to maximize it, or it could represent the lap-time of a race car and you want to minimize it. If the function F can be analytically expressed, it may be possible to take the derivative and solve F’ = 0 (since F is stationary at the minima and maxima). But in practice there are many optimization problems cannot be tackled...

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Questions on hydrologic model calibration methodologies

Posted by on Apr 11th, 2013 in Hydrology | Comments Off

Questions on hydrologic model calibration methodologies

Questions around hydrologic calibration methodologies: 1) The performance of numerous rainfall-runoff models have been tested in many catchments across Australia in recent work (Petheram etal, 2009; 2012; Viney etal, 2009; Waters etal, 2013, in-prep). Two models consistently outperform the others: Sacramento (Burnash etal, 1973) and GR4J (Perrin etal., 2002; 2003). The Sacramento model tends to perform better when assessed over the calibration period, however the GR4J model has fewer parameters and the key question remains: does the simpler...

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Hot Sunday

Posted by on Mar 24th, 2013 in 1/10 Racing | Comments Off

Hot Sunday

An unscheduled race was held today to make up for rounds cancelled recently. During the last race I entered (some time in January) the car was epic, but that was at night. In comparison, today is sunny, humid, and hot. Tyres were going to behave differently and motors would run hotter. Before my first run I switched from HPI blue springs to MuchMore reds (reminder: the weights go HPI blue, MuchMore grey, HPI silver, MuchMore red, … etc). I had liked the blue springs, but I was now looking for a little more aggression. In Q1 I sauced and...

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TCX Setup

Posted by on Dec 16th, 2012 in 1/10 Racing | Comments Off

Yesterday I ran the TCX in 17.5 blinky. It was a pretty thin class, as most of the top guys ran other classes. Nevertheless, the car was really fast! The car was good through the slow stuff, and amazing through the fast stuff. I qualified 2nd (in the only qualifier) and won all 3 finals. Here is the setup: TCX_Chas_Egan_2012_DEC_15 <— totally awesome!! Power and speed from the Thunder Power 17.5 was great, but motor temps were still only in the 50s… so more to come from that department. A few weeks ago, at the Nationals, the...

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Nats day four: Silver lining

Posted by on Nov 20th, 2012 in 1/10 Racing | Comments Off

Nats day four: Silver lining

We started day 4 where we left day 3…. waiting for the rain to end. Jordan Cullis was still keen to strike a deal to get my silver HPI spring. He offered to trade a Reedy Sonic 4.5 mod motor for them (crazy!) but I declined as I’d probably never use it. I asked if he’d give me a TCXX gear diff, and he bit. … And then, with nothing better to do, he and Sandy offered to make my TCX weapon (that’s correct, “weapon” is now an adjective). They tore it apart, checked my dampers (and adjusted the lengths),...

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Nats day three: First qualifying sessions

Posted by on Nov 17th, 2012 in 1/10 Racing | Comments Off

The qualy sessions today were plagued by bad weather and timing glitches. We managed to get just 2 runs (12 minutes driving) from 13 hours at the track. But despite the lack of track-time, I enjoyed today heaps. We were set up across from some funny dudes from Melbourne: Sandy Iavazzo, Jordan Cullis, and Oscar Piastri (11-year-old prodigy who won the Australian 13.5 titles at the age of 9!). They were all running mod, Sandy with a TC6, Jordan with a TCXX, and Oscar with an Xray. These dudes were properly fast. By the way, Sandy tells me that...

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Nats day two: Practice

Posted by on Nov 16th, 2012 in 1/10 Racing | Comments Off

Today I managed to get though my to-d0 list. I replaced my shock oil with 400 wt (from 600wt). For the job I borrowed a vacuum chamber (like this). It was awesome… I have to get one. The car was much more drivable with the softer oil. In particular, there were some bumps coming onto the front straight which always made me lofty, but now the car just dipped through them smoothly. I fitted a longer piece of antenna tube, and bent it down so it still fits under my shell. I hoped this would solve my radio glitch i had seen yesterday....

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Nats day one: Practice

Posted by on Nov 15th, 2012 in 1/10 Racing | Comments Off

Hit the track today with cousin Joe and old racing mate Pete… and about 50 other people trying to find that extra bit of pace ahead of the big race this weekend. The car has had some serious work over the past week. That includes installing TRF shocks, HPI springs, carbon chassis, adding boost (all covered in other posts). I did set a personal best lap-time of 21.7s. That puts me somewhere in the mid-field right now. The really fast local guy, Michael Sherman, was doing 20.2s. Today… Speed was good. On the straight I was faster...

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17.5 boosted timing and gearing – HobbyWing Xtreme Stock

Posted by on Nov 14th, 2012 in 1/10 Racing | Comments Off

In this post, which I will edit several times over the coming weeks, I’m going to be exploring some 17.5 boosted setups: gearing, endbell timing, and ESC timing. I am going to be setting up 2 cars. Both are Sakura Zeros running Thunder Power 17.5t motors. This post covers car #1, which has a Hobbywing Xtreme Stock ESC. Car #2 is running a SpeedPassion Reventon Pro and is covered in another post. Sakuras have default internal ratios of 1.9 (= 38/20) but I’m using an optional 19-tooth center gear to change this to 2.0 (=38/19). Car...

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