You do have resonance at the 2800 rpm. It is either the wing or the camera mount. If the wing I would not run there for any length of time. You will have fatigue failure some where in that wing. I investigated resonances in piping systems at a oil refinery.
It appears to be a simple harmonic oscillation in the camera mount, a frictional dampener can be fashioned to eliminate or mediate the oscillations. Kind of like adding unistrut and clamps to a refinery (or nuclear power plant in my experience) piping design to eliminate resonant frequencies.
Dont forget the wing has No loading on it during these test runs on the ground, I think this is why Peter is saying that during flight he see's no noticible.
Good luck Peter and just keep moving forward with the Raptor project. It’s great to see that the pressure is holding strong in the prop controller... Good luck as you progress again Peter and we’re here with you waiting for your next video. Cheers
Perfection is the enemy of the good. Keep going Peter and get it flying and ready to work with the California folks to plan for production. Like in software, there are always revisions and improvements.
@@RaptorAircraft Having taken fluid mechanics myself, you should seriously think that over. B/c this engine is designed for sea level use, the ATM opening is too restrictive. The secondary should be OK, though it's NOT DESIGNED for continuous load. Cars only need short boost, maybe designate a pre-oil cooler for the stock turbo. IMO, the air filter alone should have four (plus) times the surface area of the stock car.
@@cheerdiver What air filter? I think it was removed to allow room for some other air scoop modification. Just has a mesh across the air intake duct now.
@@JonckVideos Hasn't the Icelandic volcano that redirected traffic for months, become active recently? The goal is sweet, mainland US to HI. Dallas Ketchum did it solo in a Rutan Starship. Or at least he wrote a book about doing so on 'ferry tanks', which cause a hint of petro. Scenario: West coast to Maui. Get three quarter way, volcano ash starts pouring into the flight path.
you might consider adding graphene to all your oils and lubricants. you should test it first. i think you will be shocked at the reduction of friction, and the enhanced ability of mechanical parts to survive lubricant loss.
Glad you finally solved that bearing & governer pressure issue. Now you can move to more flight testing which should go more smoothly. Patience is a prerequisite experimental aviation.
The time tested old ways and materials will win out every time, well done ! :-) Can't wait for you to get back in the air, I am logging hours as your PT 2.
@@rustyshackleford7022 I was thinking a multi-hop cross country might be safe and doable. Like no more than 100 miles per leg, but yes, there's that minimum flight hour rule for Experimentals. Raptor must be at least 1/2 way toward the 40hrs by now. Cheers.
glad to see the update!! happy to see this bird in the air again!!! glad to see issues worked out!! 1,000,000 attabits!!, would you consider a bullet redrive? why or why not?
@@RaptorAircraft I would be concerned about the bearing on the new bronze sleeve if they have double oil seals. They will fill up full of oil and could overheat. Normally bearings which could be submerged in oil will only have one oil seal so oil can flow in the bearing. Also you could be back to the issue of the oil seals being forced off the bearing like you have had in the past. Be interesting next time you strip down if the seals are still in place. If one pops out it could eventually get mangled by the main bearings and send bits of debris around the engine again. I would seriously consider removing the seals as gives one less mode of failure.
Good on ya Peter! A methodical solution to a material problem. That is one more lesson learned & glad for it! Keep trying! Keep flying! Don’t mind the haters Crying!
Will the higher (than steel) thermal expansion of bronze cause the bearings to loosen inside of that bronze bush? Hope this design solves the issues you had...
I don't know if you are aware of a system for repairing damaged steel shafts called "metal spraying" or "spray welding" it might be of interest to you if you need to repair or are considering replacing the damaged shaft, Abom films on you tube shows how its done
I dealt with on caterpillar mine truck braking parts.I don't like the powdered metal weld spray it machines like crap, is subject to flaking and porosity. A much better process is electro-laser metal powder depositing, much more accurate, bonds better, machines better and has much better durability.
Your wing is acting like one half of a tuning fork. Engine vibration is inducing a resonant frequency - not a good thing, especially for an aircraft. You could tune the wing to move it or just avoid the rpm and prop setting that causes that. If you remember the De Haviland Comet suffered from that which lead to some losses.
@@RaptorAircraft I know more about vibration; not so much about prop wake. So I'm have great difficulty visualizing how a prop can push a wake directly off the tips and produce such an vigorous affect that far from the tip. The few times I've ventured near running prop planes all the air was going back; not radiating out. So call me skeptical on the prop wash hypothesis.
