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  1. Magnus Wallner

    Why do engine related failures cause fatal crashes in fixed wing aircraft?

    Thanks!
  2. Magnus Wallner

    Why do engine related failures cause fatal crashes in fixed wing aircraft?

    On the topic of chutes. I found this video, sorry if it'v been up here before. It's a Cirrus ditching in the Pacific. What I started thinking watching the video was what would have happened if the plane had been pulled the other way? Ok, in the Cirrus that wouldn't be a huge deal because you...
  3. Magnus Wallner

    Float Design

    What I'm trying to say is that the aoa of the wing doesn't matter much in the speed range on the water. The only thing that matter is the "keel line ahead of the step"-aoa. And the optimum water aoa or whatever we can call it isn't a constant, it varies with cg, mass, wind, surface conditions...
  4. Magnus Wallner

    Float Design

    The question was wether the illustration – copied from an RC website – applied to full size aircraft or not. The purpose was the understanding of float design. Sure, most RC models have big engines but I don't see how that has got anything to do with this – if you only wanted to get it up you...
  5. Magnus Wallner

    Float Design

    Why delete the float lower surface angle? The most common way is to use the top surface as a reference surface. The only time the lower angle is "doing" something is at low speeds on the water, during the time on the step you balance the plane (pitch wise) to find the sweet spot in order to get...
  6. Magnus Wallner

    Amphibious Aircraft Challenges

    Here in Sweden we're pretty much free to land on all water except for a few lakes used as water reservoirs. Best country in Europe by far.
  7. Magnus Wallner

    Fixed gear amphibian?

    The Republic Seabee has a very simple solution to the landing gear issue. I think I've seen something similar in the flying RIB's you see sometimes. Having the wheels "hang down" beneath the keel creates a lot of drag, I know from experience with faulty "up locks" on amphibious floats...
  8. Magnus Wallner

    Interesting Aircraft

    I like the Pond Racer. Was it a successful design? If so, how come only one was built? I wonder how it would perform with a pair of angry turboprops...
  9. Magnus Wallner

    LSA is not EASA LSA

    Maybe the Swiss interpretation of EASA rules differ but according to Swedish CAA you can fly a N-reg aircraft within Sweden with a Sweden-issued EASA license. However, it shouldn't be a problem for you to validate your Swiss license in the US. Or to get a PPL for that matter. The hard thing...
  10. Magnus Wallner

    Ballistic Parachutes

    If he had panicked at 3000 feet over the field with NO chute he would have died and you wouldn't have gotten a decent price on a rebuild project. And the UL:s would have been banned anyway. I don't really see your point here.
  11. Magnus Wallner

    LSA is not EASA LSA

    On a side note, while the NTSB mentioned in the report that the pilot didn't have a valid license and flew an unregistered and non (paper) airworthy plane they were also very clear that it did not in any way contribute to the accident.
  12. Magnus Wallner

    LSA is not EASA LSA

    The problem is that at some point we (pilots/owners/builders) will chose to abandon the system and fly anyway. It is unlikely that they will shoot us out of the sky. I'm very much in favor of working with the system but only just so far. In Europe it's very expensive to own and maintain an...
  13. Magnus Wallner

    Why do engine related failures cause fatal crashes in fixed wing aircraft?

    I sometimes use a chute in the Skybolt, it glides about as good as a polished brick. Problem is that even if it has quick release canopy (i.e. pretty easy to get out of) my estimate is that I would need to be at around 2000 feet AGL in order to know that I would have ample time to make the...
  14. Magnus Wallner

    Let's talk about fuel and ignition control

    Some engines have variable cam timing, you nees both sensor to determine the difference.
  15. Magnus Wallner

    Let's talk about fuel and ignition control

    I know that the EFII, that is IF you opt for the dual ECU setup, has – as the name suggests – dual ECU's, dual crank pos sensors (hall effect), dual MAP sensors and dual temp sensors (supposedly the critical ones).
  16. Magnus Wallner

    Carbon fiber, fiberglass, or what?

    I was under the impression that Kevlar (aramid) was a synthetic fiber, no? It's used quite much in protective clothing, mainly for motorcycle use, and in such applications the fiber is very exposed to humidity, both from weather and body moisture. Not to mention sails. Or is it mainly a problem...
  17. Magnus Wallner

    Carbon fiber, fiberglass, or what?

    I'm only talking about aircraft grade materials. I'm just curious as to why (if) there is an inherent problem in mixing wood and FRP on aircraft given that it's such a common procedure elsewhere.
  18. Magnus Wallner

    Carbon fiber, fiberglass, or what?

    Why would it be a concern to use wood (assuming of course that the design is correct to begin with)? In many other areas involving composites it's a quite common practice (think boats).
  19. Magnus Wallner

    Question on fixed wing UAV development process – when to tune autopilot parameters

    Re: Question on fixed wing UAV development process – when to tune autopilot parameter How much control does an UAV autopilot have? What kind of flying is it supposed to do? I'm on thin ice here but from where I stand I can't see why there should be much trouble by setting an autopilot up –...
  20. Magnus Wallner

    Tailwheels

    I was thinking the same thing, but a solenoid (with plunger). Energize for lock, if an electrical failure occurs it will fail open. Should be rather light, the solenoid needn't weigh much. Or a servo from the rc hobby. But then it won't fail open but in the current position.
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