"In the second WW, the Germans were using fuel injection in their aircraft. However, it is not a must for high altitude flying. Getting more oxygen into an internal combustion engine is the real problem at high altitudes."

"If the motor harness and connector is in the arm, that could be an elegant design solution for shielding without adding more weight. That assume that this was the original intent and not purely for aesthetics of course."

"Survey the number of VTOLs out there. The number is very small compared to helicopters or even multi-rotors. VTOLs are just complicated with all the extra moving parts to provide vertical thrust, vectoring of that thrust, and a control system that…"

"And what will 65K get him or even 10K???? Will it operate in extreme temperatures? Will it survive EMI, EMF, and EMP? Just a single zap from a 100KV line will fry all the CMOS chips for example. The EMI could create havoc with the video transmission…"

"He may not be looking for a toy but without any environment requirements, he'll end up building an expensive toy."

"I thought the issue was with the Emax 4 in 1. Their 12A Simonk are pretty generic."

"GPS Position Hold is not too bad in 5 to 10 knot wind but it's far from what a Naza equipped vehicle can do. Before you copy the PIDs from the video, you may want to read the GPS setup from EOS Bandi. I need to re-read it myself. Also, an…"

"That's a nicely done frame you have there. Are the landing gears machined aluminum or sheet metal?
My MultiWii multirotor is a tricopter using a Spanish Spidex frame they no longer carry from quaternium.es.  It's AUW is 3 lb 10 oz (1.6 kg) where…"

"I'm getting similar results with the MK3329 GPS module that comes with the HK MultiWii Pro. GPS hold works but it bobs up and down in the wind. RTH appears to work but the small fields I fly at constrains the testing. Baudrate is 56k at 10hz. I…"

"Is your MW Pro config.h file configured for the Ublox i.e. baud rate and data rate? I believe 38.4k or 56k baud rate at a 5hz data rate is the right configuration for this GPS. If not, you'll need to download Ucenter from the Ublox site to configure…"

"Some possible solutions could be:

Relocate GPS antenna on a pedestal and ground test vehicle inverted for quantity of satellite receptions.
Use an antenna that is omnidirectional I.e. better than hemispherical field of view.
Add a second antenna…"

"GPS antenna can't "see" the satellites when it's facing the ground."