This Bird Wants to Fly - Building the Raptor Prototype
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- čas přidán 3. 01. 2019
- Things are really starting to come together with the prop fitted and the cowling not far behind. Adding a power controller to the landing gear pump has smoothed out the gear operation somewhat but there is still room for improvement.
- Auta a dopravní prostředky
You guys got some big balls, not only building a plane from scratch with many new methods like composites and such and then to put all your trust into this aircraft. I just finished converting a 1986 Chevy K30 Military Truck by installing a 5.3l LS Fuel injected engine and I’m afraid taking it on the Highway and brake down because cause everything is so new and untested. Lol Much Respect!!!
Looks amazing! The black combined with the 5 blade looks so epic.
Looking good Peter, I like the 5 blade prop as well. It’s all coming together!
5 blade looks awesome! Black prop with contrasting leading edge is 👌
The prop looks great. She is getting so close now. I can't wait to see her fly.
The 5 blade is bad-ass and will perform better, so it’s a no-brainer...Outstanding work Peter and team. You guys are doing amazing work!
I don't know why this popped up in my list of suggested videos but I'm glad it did. I watched the entire video and am now subscribed
the prop looks stunning with the black cowling on it... kudos !!!
More impressive every time I watch!
The 5-blade prop...in black...looks spectacular! Well done. Press...
Been watching since the start, brilliant work ! Five blade adds factors that makes sense.
Looking fantastic. great job guys
This is so fun to see the progress. Keep it up, it is coming together. Excited to see it fly.
Landing Gear up and down (very important) Looking great with that prop. (wow)
Looks good Peter. Cannot wait to see this bird fly!!.
Claude
Handsome looking aircraft. Looking forward to seeing it in the Air.
I absolutely love it! Can’t wait for the flight! Great job guys!
The 5 blade prop seems like a good choice. This thing is looking awesome!!!
Excellent.Looking good .
Loving this build...and yes, 5-Blade looks great. Keep up the amazing work!
That’s one mean looking beauty. 5 blade looks stellar. Mt’s are built like tanks. Love it. Can’t wait to fly this thing high altitude aerial mapping work in Canada!
Looking great guys!
Awesomer and awesomer! Thanks Peter and crew. Yes on the five-blade.
The 5 blader looks great mate.!!
Prop looks super! Congrats.
The five bladed prop looks so much better than the four. I bet the Performance is also a lot better with the five blade over the four blade. Very impressive cant wait for it to start flying.
Amazing and beautiful!
An excellent long term view of the teal T-shirt. I think we got 10 seconds of the spinner at the end though. It really is a beautiful plane coming together.
good luck with the project, looks neat !
That top down view looks great!
I've been watching this from the beginning. I can't wait for this bird to take to the air. The 5 blade looks great, you guys have done a great job.
Great looking aircraft ,very badass
Looks awesome great job guys keep building
you guys are doing a great job! ive been here from the start
Nice production values. Very interesting.
That blade looks badass and sexy! Excellent choice for all round looks and function. Can't wait to hear how the numbers look with it.
Agree with Devon, 👍🏼, top down view spectacular!
looking forward to the following video, nice looking plane
Great work guys. 5blade prop is the Boss
The five blade looks awesome!
Just like everyone else - LOOKS AWESOME.
5 blade looks hot! Dude keep up the good work
The prop looks cool it matches the plane design
Fantastic job , can't wait to see it flying, fingers crossed.
There are several Lake Amphibians flying with the MT prop.
On the 6 cylinder (IO-540) powered Lake Renegade, there have been some instances of blistering on the side of the prop that faces the exhaust. The theory is that the wood used in the core was not 100% dry and the expanding moisture in the presence of hot exhaust pulses leads to delaminating blisters.
This is something you will want to watch for during flight test. Also, it’s hard to tell, but it looks like your blades have the black rubber erosion tape at the blade roots. MT calls it “PU tape”.
On the Lake Amphib STC, there is an allowance (and recommendation) to remove these LE “boots”. The exhaust heat will eventually soften the adhesive and you might throw a boot in flight (prop imbalance).
Now with diesel power (and the turbo), you might not have any of these issues, but I wanted to share my experience with MT props and pusher setups with short exhaust runs.
Looking awesome. Can’t wait for the test flight.
Sure looks amazing!
That’s a bad ass build you guys!!! Keep us informed!
Wow , that a amazing unit .!! Cool
Thank heaven we got to see some more work on the door. My heart couldn't take the suspense.
12.35 Wow looks fantastic.
Having the gear go up unevenly is pretty common if you look at retractable Lancairs or warbirds. I wouldn't worry about it, you're in good company! ;-)
These are great to watch. You are rapidly approaching that well-known point in complex projects like this: you know, "ninety percent done, ninety percent to go" :-)
fantastic project. I will be eagerly awaiting the opening of deposits again in 2019
I’ve been watching you since the beginning getting excited The closer you get to finishing I think you guys been doing a great job I really enjoy watching your progress. Thank you for sharing happy 2019 PS 5 blade looks amazing A lot better than the four blade
Wonderful progress Peter & team... I am one of many who eagerly await each video update and will be punching the sky when I first see this baby fly. 5 blade prop is a no brainer ..for reasons stated. Looks great... Re Landing gear retraction, I recall a discussion with a hydraulics expert some years ago about keeping a couple of cogs in "sync".. He told me that there were a couple of ways they used, including putting the action hydraulic cylinders in series, thus, by definition, both will work EXACTLY in sync as each moves the same amount as same qty fluid is passed thru each.. The other way was to put a restriction in the line to both, or in this case, all three actions.. Maybe more restriction in the front and a little less in the rear one (but the same in each rear cylinders). That way you could get the timing right, by juggling restrictions, so that all wheels raise and lower together.. obviously the restriction cannot be too small or will interfere with landing gear down... Keep up the great work !
I was going to mention the restrictor but someone (ahem) stole my thunder.
A restrictor to the nose gear would slow it's motion down to better match the speed of the main gear and allow more volume to divert to the mains as well. The size of the restrictor would have to be determined. Restrictions to the mains could be needed as well.
An accumulator may be necessary to take out the bouncing/jerking motions of extension and retraction and should also ease the motion slamming to the end of travel.
As a former A&P who helped build a Velocity I thoroughly enjoy watching the progress in each new video.
@@BadBobV65 I agree with the accumulator.
There are small, pure mechanical "rotary gear flow dividers" for some $200 that would do the job. They make sure N hydraulic cylinders (with same volume) stay in sync.
That's another job done!
(should be the Raptor t-shirt and coffee mug slogan...) 🙂
I agree with kevc114, another way is to use cylinders with internal snubbers at the end of travel.
I enjoy your videos, reminds me of a friend's build of a Cozy 4.
Rollie
Awesome update
5 blades looks cool
Yes, I like the 5 bladed prop for all the performance and audible reasons mentioned and because it just looks great!
Excellent job, I fly a challenger 604. And on the 604 the gear handle has to be pulled and the moved up as a extra safety precaution, I noticed that it is the other way around in your aircraft. Take care and keep up the excellent work.
Stunning!
Yes the 5 blade is the one and the plane is looking awesome too.
Beautiful
I totally agree the five blader will give you a better performance and lower noise configuration.
12” prop ground clearance at taxing sounds a little tight. At what angle of attack would the prop make contact with the runway? The rear landing gear look a long way away from the prop. That sweep the field before taking her out. The prop will eat all the stones kicked up from the landing gear.
my thoughts exactly. plus landing gear flex on a hard landing with reasonable angle of attack would eat up that 12" cery quickly
Not an expert but I felt the same when I heard that
Rafal good point!
25k views..... the raptor fan base is growing!
It might be a new crowd of haters rather than followers. 😀
One idea to solve your gear retraction problem:
Put in check choke valves to the non pressurized side of all retraction cylinders.
The choke will cause the system to build constant pressure, thus eliminating this stick slip effects you are seeing.
It will also take over the retraction speed regulation.
Because of the check valve, the gear will extend like normal.
I agree that the 5-blade is the way to go for the reasons stated.
@@PistonAvatarGuy didn't he change the final drive gearing to a higher ratio ?
5 blade, no question
The 5 blasde prop amd spinner in black look great and of course it wil look just like the main picture once flying. Great job guys, looking forward to seeing it all together and the start of the taxi runs - I take it you are going to place multiple cameras on and inside the aircraft for the taxi runs and test flights.
Got plenty of camera mount hard points already installed. You missed one of the recent videos where I showed them.
Tisk...tisk...
Congratulations, you are at last seeing the fruits of all of your labors. Many trials and tribulations have preceded this moment and probably a few more to come as the moment of truth approaches. Now you know how many of the early air pioneers felt.
Awesome. I love it. Lower noise is to me even more important than performance, as landing fees are almost always tied to noise - And they can easy rival fuel cost - especially when considering the proposed milarge of the raptor.
You must be from Germany. 😋
@@marcanderson7748 :)) Jup, is some ways the worst place to fly :(
@@HansFranke sorry brother, I love Germany but it's the only place I've ever flown where they dictate specifically how you are allowed to fly your visual approach. Don't want to disturb the neighbors!
@@marcanderson7748 Oh, I don't mind such regulations. After all, Germany is (for most parts) rather dense populated and we need to get along.
What's worse is all the buerocracy , mostly geared at making flying next to impossible. Basically a left over from after war regulations to keep Germans grounded. It's geared to keep everything as is, no changed, not improvement whatsoever. Just think of it, publishing a GPS aproach for an airfield is handled (amlost) like establishing a new one - no matter how many decades the airfield is operating or how much a GPS aproach would improve noise levels and security.
And then everyone acts as people flying are incredible wealthy. Every fart is associated with fees and restrictions. Sometimes I expect some guy showing up after landing and count my steps until leaving the apron to charge me for each separate - plus tax ofc.
The thumbnail attracted me to your airplane I think it's the most beautiful thing I've ever seen. 😁
looks good
Really cool kind of looks like one of those prop fighters from Sky Crawlers the Sunka
Idea for gear - would an adjustable pressure regulator close to each of the three actuators help them all work in unison? 5 blade looks great, higher the number of blades the lower the acoustics and the vibration. Great progress, once the big pieces start coming together it gets really exciting, great video.
Prop looks nice. The proof will be in resonance to crank via gear box
My computer must have crashed before my comment was entered, so here it goes again, albeit condensed:
Prop looks great; the only way to make it better is to add another one and make them counter-rotating!
Landing gear problem: Have you ever considered linking the main gear together mechanically with a bell crank/push-pull tie-rod arrangement? It would eliminate the need to balance them hydraulically and could be powered by a single circuit, and adding a single geared DC motor for a backup along with an manual emergency release to utilize a gravity-assist to lower the gear isn't too hard to imagine. You solved the door lock mechanism with such a mechanical arrangement, so I trust this won't be too far-fetched, and would likely be much less of a challenge than balancing two hydraulic circuits. If you strictly use the single electric servo motor approach, you could probably control and integrate it with your mini-computer system (was it a Raspberry Pi or Arduino?).
Makes great sense for 5 blade besides looking great, for gear suggestion possible individual small pressure tank for each main gear.
Great video, prop looks amazing, waiting for mine sucks. Any chance you have an idea where Vs will be? Wondering what approach speeds will look like.
Imagine the possible upfront options that may become available for us 2nd Generation Deposit Raptor Pilots. Looking forward to Future Raptor fly-ins. Although no problem at all with current configuration, should a 6-passenger, turbo-prop model Raptor ever become an option, we'll be all in for that too.
That thing is going to be a real screamer once you get her flying.....one word comes to mind! DAMN!🤓
Hope u succeed on your project
Your locking pins are the same design as the CMC Leopard that I restored, make sure you have good drainage in the recess , I had no end of problems with locking mechanism because of no drainage. Love the build by the way.
If you can engineer a high Vlo speed it will help when the gear is used for drag to slow for landing. Conversly, a higher retract rate helps to reduce drag when performance is an issue such as heavy on takeoff, or high density altitude. Nothing like struggling to accelerate as you hum a tune and wait for the gear to retract... I suspect you may have considered these point thoug. Thanks for sharing the progress.
The act of extention is not the motive force of drag but the configuration and resultant parasite form drag would be. Given that no spoilers seem in the plan , the gear system, when configured , is the air brake. If designed properly, limits in the gear system avoid self destructine tendencies. You don't want to be doing S turns to slow for configuration changes on an instrument approach or to make an RNAV Star altitude window or speed.
But then, I'm just a guy in the gallery...
As a random CZcams viewer my opinion is the most valid; I would prefer a 27 bladed propeller. I mean, they keep adding another blade to my razor every year so more has got to be better right?
The fewer blades a propeller has, the more efficient it is. However As engine power increases, you need to increase the size of the lifting surface. Craft design and tip speed limit how long you can make a blade. Aerodynamics limit how wide the blade can be. Having exhausted both, the only way to get more lifting surface is to add more blades.
In theory you can make supersonic propellers. It has been tried in the XF-84H. This craft earned the nickname „Thunderscreech“ because it was so loud it gave ground crew and pilot migraines and seizures, and the tower crew requested the craft to take off out in the saltplane because if it used the runway nobody in the tower could understand a word they where saying. Nobody has since bothered with supersonic propellers.
@@pyalot I was being incredibly sarcastic man, but thanks for the explanation.
Dick head
Kraken isn't that how jet engines work with all those fans?
@@pyalot so 0 propellers = 100% efficiency?
Turbo diesel with a 5-blade prop, gonna sound great! Looks pretty serious!
Been watch this series now for at least 3 years now, really coming together and a credit to you and your team. Would an accumulator help smoothing out that landing gear? What I know about engineering could be printed on the back of a postage stamp mind you, just a thought. Just lovin watching a fellow Aussie do some great stuff overseas.
Question: Do you have jack points planned for the production models to facilitate retract tests, changing tires, and other work on the gear? (I could show you an example on a Lancair IV.). I don’t think you need to worry about the gear coming up unequally as long as the retraction is quick enough. Many hydraulic gears operate that way. The Lancair IV gear comes up unevenly when retracted on ground, but its not issue in flight. If you look at videos of Piper Aztecs take off (also hydraulic), you will see that most retract main gear unevenly. As others have commented, I would sure like to see the prop clearance with the plane tipped at a 17-18 degree AOA, but I know you have calculated everything so it won’t be a problem. The prop (and plane) look great!!! Keep up good work. Have been following for months.
You can jack it on the spars and forward bulkhead points just as we have it resting on foam blocks now.
Use an accumulator in your hydraulic system to damper the load of retracting the gear.
You should be able to find hydraulic balancing valves where you can meter flow equally (or unequally as necessary) to balance the gear. This may also help with the aggressive finish as the last gear gets 100% of the flow at the very last second.
.....and @ 12:00....even BETTER!!!
Peter, you can use a rotary flow divider to sync the rear gear. It's use to synchronize gear motors or cylinders.
I saw those horns Devin!
Beautiful bird, I can’t to see inflight.
Great 5 blade prop, Peter. I like it better than the 4 blade prop. It looks like you've untangled some knots since I wrote last. Great!!
Well done guys..I think 5 blades is better n less noise n better performance..👌🏼
G'day Peter happy New Year to you and the Raptor team. Fantastic progress can't wait to see it fly. As to the question of the prop. If the performance stats say the 5 blade is as good or better than the 4 then it's a no brainer! 5 everytime.I'm in Sydney and considering going to Osh Kosh this year (bucket list item).At this stage do you have any plans for exhibiting at Osh this year? Keep up the good work.
If all goes well I hope to have it up there this year.