"The Fox 3m also seems a good choice for you. Just the Eppler 205 airfoil has some critisism, being a bit outdated. The HK ASK21 has the Eppler 205 as well. I can't judge the Eppler 387 of the Roke. But I wouldn't worry too much…"
"The HK ASK21 is designed for approx. 1.5kg flight weight. It should be well possible to add 50% weight, equals to 750g totalling to 2.25kg. I would be cautious to go heavier. Start at the designed weight, add weight step by step, observe how the…"
"For 120min endurance an efficient airframe is required.
You don't need forward view, go for a motorglider airframe. You can choose from a wide variety of models, they are very efficient and good mannered.
Don't try to mount your cameras in…"
"Concerning the airframe you must first define your requirements:
- Weight and size of payload?
- Forward view required?
- Endurance in time and distance?
One of the following will probably meet your requirements: If you don't need forward view,…"
"The Maja is aerodynamically not efficient. Therefore I suggest to adjust the rules of thumb:
1. Prop pitch ratio at 0.75 (lower)
2. Pitch speed a bit under double the cruise speed (unchanged)
3. Propulsion power around 150W/kg (higher)
"@ Joe: I just found that the newest progress of aerovel is on Youtube, not on their website. Why they don't update their website is not clear to me. They seem to be making some progress, which is nice."
"@ Joe: Thanks for the indication. I am well aware of the Flexrotor. See my post on July 30. I like the approach, but it seems to be quite difficult, they havn't published any progress since two years. I am more than happy to…"
"@Martin: With 13 W/kg you have an efficient setup. With our small long endurance flying wing (140cm) we acheived around 25 W/kg. We are flying at 50% higher speed, abound 20m/s. That is helpful in real missions when wind is present…"
"Yes, the study of Hepperle and Selig helps this discussion. I will do so as soon as I find some time.
I agree there is no simple rule "choose a smaller propeller for cruise-efficiency". Exactely like there is no simple rule…"
"I agree, high advance ratio is efficient for cruise.
But I cannot agree in your general statement of larger propellers being always more efficient. As stated already above, why does nobody build huge propellers (e.g. same as wing span),…"
My ArduPilot project came to a stall during late summer and autumn, mainly due to the soaring and then slope gliding seasons! Now that days become shorter (and winter evenings longer, I'll try to finish tweaking this project. So I'm sorry not to be very helpful right now, many have taken the advantage with successful ArduPilot flying experiments. I am sure I'll come up with a completed UAV this coming spring. In the meantime, I'll of course share my experiences in my posts on this blog.
Just out of curiosity: are you going to the Outback Challenge alone from your ZH base or do you already have a team set up for Australia? Don't you need some more partner?
Hey you're pros! You'll probably loose your time looking over my shoulder. I am just an archaeologist taking grasps of online tech to fill my leisure time! My setup is somewhat described in my pages here, and in different posts around. If you'd like the last code versions I experimented with, you're welcome. I can gather them this week and pm them to your aerovista contact email.
Seems you've got plenty of specialists for bringing that outback challenge home!!! by the way, once you get some work/experiment to do with aerovista airfrmaes between ZH and BE (or further West), please leave me a note. I'd like to see you operate in the field. Is it a double Easyglider foamy you're using? Or a double Cularis? It looks terrific (in the good sense of the word, of course).
I choose ArduPilot because it's the first open source AP community I stumbled upon. It was in it's youth, was very promising, and was the most accessible. The "low cost" idea appealed me too. I think it still has great potential, though it may not be the best option for someone wanting to go professional since it's not an out of the box RTF autopilot.
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