- Apr 14, 2020
Is the swept wing also part of the reason it’s susceptible to dutch roll?
We have been speculating on why for months. We do know that there was little if any weight control until is was finished and put on a scale, then everyone including PM was shocked, shocked by the number. Speculation is that the engine is heavy and we have seen some impressively thick laminations in a number of places. Beyond that PM has not gotten into how he will reduce weight towards the target values...
I cannot find any reliable BSFC data for any Aeromomentum or Viking Valkyrie turbo (not Naturally aspirated) engines that are DYNO proved at the PROP. Its not OK to use 'vague' claims to shoot down the hard work of Jet-A engine makers especially when you are trying to nail PM to the pole. There is nothing I can see on the 'official' websites of the auto converters which support a blanket 250g/kWh. Unlike Technify and Rotax which both have this data and publish detailed information for aircraft designers.You believe wrong.
It amazes me that a poster is too lazy to to spend 3 minutes on Google to fact check their own words.
IIRC in models there’s a rough rule of thumb that every five(?) degrees of sweep is equivalent to one degree dihedral. Surely the effect scales up though it’s probably prudent to calculate it better than that if you're making an airplane you intend to sell.Might need some anhedral to fix Dutch Roll.
Free flight but dihedral required should be dihedral required. Everyone building FF “knows” that we need a bunch of dihedral for stability but some have been shocked to find their swept wing model may need a touch of anhedral to cure trimming troubles.Is that from free flight modelers or RC ?
Perhaps I chose a bad example to illustrate pressure across a known orifice (injector, plate, spray nozzle...) can indeed result in a good/accurate flow measurement.EFI can be calibrated fairly well. It does usually know the delta P, though. The delta P is fixed on my car, the fuel pressure regulator having the low side plumbed to intake manifold pressure, making it really easy. Diesels are dealing with cylinder pressure. Some diesels measure this via the glow plugs. We don't know if the stock Audi or Peter is doing this.
If he can measure cylinder pressure, that should be a key tuning parameter. Too much will trash his engine, not enough will give poor power and efficiency. So, you'd have thought Motec would have given a graph for it, if available.
Some people understand that there is 16 ounces in a pound, and some don't, is why.
Maybe that GE flight scared him enough to realise he's in over his head.The interesting thing is that there isn’t a new video of him making 5 more ground effect runs.
Maybe he’s not quite as confident/sure of success as he indicated in the video.
Perf one of his recent videos, his airworthiness certificate has been renewed and updated to take the relocation to Valdosta into account... His "flight" was legal in that sense....Did he ever get his renewed airworthiness cerft. back ? I remember seeing him say they came out for the inspections again, but dont remember saying he was good to go to "fly" again. Maybe he wasn't supposed to try that ground hop and he's laying low until his paper work comes back ?