darryl ramm’s blog

In late 2005 I installed a large (64W) solar panel on the Cobra trailer for my DG-303 glider and it has worked great. I get asked about the solar panels, so I thought I’d save some information here about it, largely stuff that has been posted in the past to private newsgroups. I’m going to be installing a similar set up on my ASH-26E trailer, but I may play with different charge controllers (more on that in future).

My DG-303 has dual 12 amp hour batteries. I have two sets of two batteries, so I can always have a set charging while the others are in use. I wanted to also be able to leave all four batteries in the trailer hooked up to the solar panel when the glider is not in use. With my glider the batteries need to be removed from the glider for disassembly so it made sense to just make a mount for four batteries in the trailer rather than charge some in the fuselage of the glider parked in the trailer.

I wanted a significant amount of solar power available; something like enough to fully charge a fairly well used pair of batteries on a good sunny day. This meant a large panel with charge controllers, a place to mount four batteries and one or more solar charge controllers depending on the charging scheme. All up costs for this project was around $600 - it could be done for less without some of the over engineering in my set up.

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Thanks to the folks at Alexander-Schleicher it seems I do have an ASH-26E after all. Another glider under completion in the factory. The plain blue stripe will go — and will be replaced by the modern style multicolored swoosh. This glider has no instrument panel so I’m running to get instruments sorted out. It has a fiberglass top trailer already with it which will get swapped for an aluminium top trailer.

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I spent the last two week trying to jump through hoops and buy the order position for an Alexander Schleicher ASH-26E motor glider currently under construction in Germany. It would have meant having a great motor glider here for the peak of this years soaring season. Unfortunately the deal with the current purchaser fell through when he changed his mind and decided to keep the glider. Things were happening so quick and the glider was on such a quick delivery timeframe that I was crunching through options and panel configurations. I even had checked on insurance and started to reserve a N-number. Sigh. So I’m left without a glider but with a panel layout that I like.

I used the Word document from Schleicher that has a graphical panel layout in it. Not sure why they distribute it in Word. I copied the graphic elements over to PowerPoint and also hacked them with Photoshop and some images to mock up what it would look like. Who knows if everything on the panel would have been able to fit perfectly.

Big things for me are the 3 1/8″ United Instruments 5934 series altimeter, a larger airspeed indicator is also nice and if possible using Klixon circuit breakers on the panel instead of the usual fuses. The Altimeter is really important for me, after sitting in a ASH-26E and looking at the 2 1/4″ diameter 20,000′ Winter altimeter it just looks very small and difficult to read compared to the larger 3 1/8″ diameter United altimeter that I fly with now.

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I’ve posted most of this in the past to some newsgroups, but people keep asking about the PDA mounts I have in my DG-303 so here we go.. after experimenting with different options I settled on the mounting arrangement shown in the photos above and I really like how they work.

I use HP iPAQ hx4700 PDAs, these are relatively high end PDAs that are no longer in production but may still be available, at least used ones. The hx4705 was the same PDA sold through different channels. The hx4700 have 4″ diagonal transflective VGA resolution (640×480 pixel) screens. I run SeeYou Mobile so the processor power of the hx4700 is useful but the PDAs are not perfect, more on that below. I have the 3600 mAh extended Li-ion battery packsinstaled that allow the PDAs to operate with a CF card GPS for something like 6-8 hours — providing a backup navigation system if everything else fails in the glider. Failing that I’ve got a compass and sectional charts and I’m not afraid to use them.

Although I’m using hx4700s many of the comments below will apply to all PDAs.

Almost all color PDAs use transflective displays, these do not work well in sunlight. The best thing to do is to get the PDA close to your face and pretty vertical looking straight at you. You don’t want to be looking down at a PDA angled partially up at the sky as it will reflect a lot of light back off the screen. I tried the PDAs with bare screens and with the Boxwave ClearTouch Anti-Glare screen protectors which do improve visibility in daylight a little. Make sure you get the ClearTouch Anti-Glare not ClearTouch Crystal screen protectors.

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Naviter has released improved resolution Landsat imaging for for their SeeYou soaring planning and analysis software. A nice improvement in resolution as you can see from the screen shots on the left. These screen shots show part of a flight I made last year from Minden Douglas Airport (KMEV) in Nevada. The 38th north parallel runs through KEMV. In these screen shots you see the new higher resolution imaging south of the 38th parallel and the previous resolution imaging to the north.

The release of improved resolution terrain imagery for SeeYou is likely a slow (there is no reason to hurry) response to Sierra SkyWare releasing WinPilot 3D to compete with SeeYou. One of the leading benefit claims Sierra SkyWare was making for Winpilot 3D was its 3D visualization and imaging resolution. 3D visualization is one of the sexier features of SeeYou so this was pretty much a frontal assault on SeeYou.

A frontal assault on the dominant market leader, including where when there are already other vendors (StrePla) in a market segment just does not sound like good strategy for me. You can run up to the castle and pound on the gates and not many people will care. But if you manage to annoy the owner of the castle enough they pour a little boiling oil over you, and you either die or you leave, a lot worse for wear…

A new toy finally arrived. A solar panel installation kit from Strobl Solar for my club’s DG-1000S glider “1CH”. More photos of the kit are on flickr. (more…)

I am installing a DC power cable for the Zaon MRX in my glider so I don’t need to worry about feeding it AA cells. The Zaon has a 2.35mm OD/0.7mm ID barrel style DC power jack and it is hard to find good quality plugs to fit these.

DigiKey has these plugs available with preassembled cables here. Right angle plugs, overmoulded strain relief with 6′ of 11 strand AWG 24 wire with bare ends. I brought ten for myself and some other pilots. (more…)

Yes a little glareshield that keeps the sun from reflecting off the display on my Zaon MRX.

Based on good feedback from fellow pilots I purchased a Zaon MRX PCAS (Portable Collisions Avoidance System) for my glider last year but have not had time to fly with it much yet. It attaches to the top of the instrument panel glareshield on my DG-303 with velcro. The bright LED display on the MRX is readable in daylight but the display surface is shiny and this is some times a problem with sunlight reflections. (more…)