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Kingtech Turbo Prop Engine

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Kingtech Turbo Prop Engine

Old 10-22-2015, 06:38 AM
  #101  
DocYates
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David, I just got the Biela prop which is supposed to be the preferred prop for the engine. It says it is a 24 x22 3 blade. Have sent one of them to Tru Turn to have a spinner cut for it. Does anyone know the prop bolt size on this engine? I need to either buy a spinner adapter or make one? Thanks
Tommy
Old 10-22-2015, 06:50 AM
  #102  
bevar
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Gents,

What is the weight at takeoff of the PC-21? From what I have seen it's smaller and lighter than the 1/4 scale Tucano from CARF. Is that a correct assumption?

Boli
Old 10-22-2015, 09:54 AM
  #103  
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David,

I'm running the SEP 24/17/3. It gives me the exact performance I was looking for on the Raven which was a good balance of speed and vertical which I didn't have before.

On the PC-21 I would think you would want a little more speed; and since we have some data on the SEPs, you would probably be right in the ballpark with a 24/18 or 24/20, but I'm not sure of the sizes available. If you're looking for a Biela, then I'm sure the numbers may shift slightly due to the of composite vs. wood.

Let us know what you come up with.
Old 10-22-2015, 10:56 AM
  #104  
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Originally Posted by David Jackson
Curious to know what propeller (diameter, pitch, and maker) many of you are using on your K-60tp? I am still searching for a prop that will provide the best performance (speed/vertical climb) for my PC-21. So far, I tried the Fiala 24x17 and the SEP 24x22. Had to reduce engine rpms for the Fiala prop, and could not spin the SEP 24x22 higher than 3000 rpms on the ground. Biela prop should be delivered tomorrow, but doubtful the results will be any better. Unlike testing props for a glow, gas, or electric setup, trying to find the right match for this puppy can get pretty #@×n expensive. Would greatly appreciate comments from those of you using the Kingtech K-60tp.
I'm using a Solo Prop 3 blade hub and 3 Corsair style blades. The diameter is 22 inches and the pitch is dialed it to 22. Not the cheapest option but works very well. Blades can be replaced individually.

Kirk
Old 10-22-2015, 10:57 AM
  #105  
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Originally Posted by DocYates
David, I just got the Biela prop which is supposed to be the preferred prop for the engine. It says it is a 24 x22 3 blade. Have sent one of them to Tru Turn to have a spinner cut for it. Does anyone know the prop bolt size on this engine? I need to either buy a spinner adapter or make one? Thanks
Tommy
Mine came with a prop bolt that had the center drilled out and has 10/32 threads for attaching the spinner.

Kirk
Old 10-22-2015, 11:02 AM
  #106  
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Originally Posted by bevar
Gents,

What is the weight at takeoff of the PC-21? From what I have seen it's smaller and lighter than the 1/4 scale Tucano from CARF. Is that a correct assumption?

Boli
Boli,

Mine weighs 40 pounds without fuel in the main tank and a full UAT. Haven't weighed it with fuel. I have all of the equipment installed as far forward as possible and did not have to add nose weight to hit the CG. The main fuel tank is on the CG so there is no change in CG during flight. Not sure on the measurements of the Tucano but the PC-21 has a wing span of 90 inches and a fuse length of 112 inches.

Kirk
Old 10-22-2015, 11:29 AM
  #107  
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k sonn, Your spinner or your engine came with a bolt? My engine came with two bolts, neither of which are drilled for a spinner. I could make one with access to a lathe, but Tru Turn offered one with the spinner. Just have no idea of the thread pitch and size.
Old 10-22-2015, 02:44 PM
  #108  
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Kirk,

Thanks. The Tucano has a 110" wingspan and weighs around 53 pounds at takeoff.

The reason I asked is that I have seen Chief's fly at Kentucky and yours online. I have also been following with interest the prop pitch discussions. After watching your video and you supplying the aircraft information, I have to think you guys are heading in the wrong direction. Video can be deceiving but it really seems like the PC-21 is really lacking in performance. I think the prop pitch is way too high and you are losing a tremendous amount of thrust as a result. I can post videos of my Tucano when new and had the Gen 1 Jet Central motor, which does not put out the power that the new generation units (of all brands) put out and the performance is staggeringly improved over what I have seen with the PC-21 Keep in mind the Tucano is heavier and almost 2' more wing...which is drag.

I don't know what the gear ratio is on the KT TP but over pitching and bogging down the motor is never a good combination. Trust me...you could put a 24/12 3 blade on it, dive it full throttle towards the deck and you probably won't hit 8 grand. Of course if there is a design limitation on the KT unit and you have to keep the revs low that's different but my experience tells me that you guys are killing yourselves performance wise by over propping.

Just throwing my .2 cents in...

Boli

Originally Posted by k_sonn
Boli,

Mine weighs 40 pounds without fuel in the main tank and a full UAT. Haven't weighed it with fuel. I have all of the equipment installed as far forward as possible and did not have to add nose weight to hit the CG. The main fuel tank is on the CG so there is no change in CG during flight. Not sure on the measurements of the Tucano but the PC-21 has a wing span of 90 inches and a fuse length of 112 inches.

Kirk

Last edited by bevar; 10-22-2015 at 02:51 PM.
Old 10-22-2015, 03:37 PM
  #109  
George
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Originally Posted by k_sonn
Mine came with a prop bolt that had the center drilled out and has 10/32 threads for attaching the spinner.

Kirk
Same here, but mine uses a metric bolt (M5 I believe, but would have to verify next time I have it off) for the spinner.
Old 10-23-2015, 04:06 AM
  #110  
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Thanks I checked the bolts when I got home and actually both are already drilled. At least one of them fits a 10/32 screw. Not sure how I overlooked it. Appreciate you guys pointing it out to me.
Old 10-23-2015, 07:48 AM
  #111  
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Originally Posted by DocYates
Thanks I checked the bolts when I got home and actually both are already drilled. At least one of them fits a 10/32 screw. Not sure how I overlooked it. Appreciate you guys pointing it out to me.
Glad to hear your bolts were drilled. What size and style spinner did you order from Tru Turn?

Kirk
Old 10-23-2015, 07:57 AM
  #112  
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It will be a P-51 style spinner, three blade, 4.25 inch diameter. I sent them a blade so they could custom cut it. You need 50% of the material remaining in order for the spinner to be flightworthy and I think i was cutting it close, considering the size of tis prop. It is going on the Airtractor
Old 10-23-2015, 08:11 AM
  #113  
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Thanks Tommy. Do you have a build thread? I'd love to see your project.

Kirk
Old 10-23-2015, 08:28 AM
  #114  
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I don't have a build thread. It is 144 inch WS, weighs in the neighborhood of 38 pounds. All scratchbuilt from Duane Habets plans. Ply, foam, balsa, glassed, with CF inside for strength. The wheels are 6 inch, the gear strut is 5/8 inch custom bent. It is 1/4 scale version of the two seat military version of the AT-802U. Has two bomb drops under the belly and wing racks with have missile launchers when complete.
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Old 10-23-2015, 08:57 AM
  #115  
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Nice Tommy. Always loved the air tractors since I was a kid watching them dust crops.
Old 10-26-2015, 11:26 AM
  #116  
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Who made the exhaust's - neat project
What RPM will it turn ?
Old 10-26-2015, 12:09 PM
  #117  
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The exhaust stacks were made by Tam. I think they are the same ones that fit the Jetcat turboprop. I cut them and shortened them up for my purposes. Have not run the engine yet, maybe this coming weekend if all goes well. Hoping for 5200 rpms on the ground, and 7000 in the air.
Old 02-23-2016, 11:05 PM
  #118  
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Hi David and George
Well I bit the bullet and bought a Kingteck turbo prop mounting it into my pc21 i will try a 26x14 Beila 3 blade on it where do I get exhaust extensions from can;t believe they don't supply them
Old 02-24-2016, 04:25 AM
  #119  
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Originally Posted by t6racer
Hi David and George
Well I bit the bullet and bought a Kingteck turbo prop mounting it into my pc21 i will try a 26x14 Beila 3 blade on it where do I get exhaust extensions from can;t believe they don't supply them
Congrats!

You can get the stacks from Tam, CARF or Grumania. I think you can also get them from JetCat, but it might just be a Tam pipe that they resell, not sure.
Old 02-24-2016, 05:48 AM
  #120  
David Jackson
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Originally Posted by t6racer
Hi David and George
Well I bit the bullet and bought a Kingteck turbo prop mounting it into my pc21 i will try a 26x14 Beila 3 blade on it where do I get exhaust extensions from can;t believe they don't supply them
Hey t6racer,

Good luck with PC-21. Curious, are you mount that 26" diameter prop on a Skymaster PC-21? The reason for this question, I've been using a 24" diameter prop on my plane, and notice how little clearance there is between the tip of the prop and the ground. So just wondering if prop/ground clearance is going to be a problem.
Old 02-24-2016, 02:09 PM
  #121  
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Hi David
This a true 1/3 scale pc21 made by Aerobell in in Switzerland fully built up no longer made fuss 10ft10in long wingspan 8ft4 in from memory it will weigh 51lbs
I have a photo of it on my models on this site not a problem for ground clearance with that prop.
Old 03-12-2016, 08:40 PM
  #122  
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Any word on the K-100TP that was first mentioned in 2013 but is still not available? Have you guys tested more props on the K-60TP?
Old 03-12-2016, 09:53 PM
  #123  
David Jackson
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Originally Posted by bluelevel
Any word on the K-100TP that was first mentioned in 2013 but is still not available? Have you guys tested more props on the K-60TP?
I have tried the SEP 24x22 three-blade prop, but was not able to spin it higher than 3500 rpms. Tach may have been the issue. Also ran the Biela 24x22 three-blade prop which seemed to have much higher rpms, closer to 4750. Haven't run the engine since late October, but plan to get back to it by April. Will let you know how the PC-21 performs with the Biela prop, don't plan to use the SEP prop.
Old 03-14-2016, 08:42 AM
  #124  
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Originally Posted by bluelevel
Any word on the K-100TP that was first mentioned in 2013 but is still not available? Have you guys tested more props on the K-60TP?
No info. on the 100TP. Regarding props, I have stopped 3-bladed testing as I have found the prop that works for me. This spring I will be trying to find a 2-blade, but will be starting with a 28X12 or 14 as I think this will be just right.
Old 03-29-2016, 04:41 AM
  #125  
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After a year of fitting and testing, and finding parts that would work, the AT802U finally flew with the Kingtech turboprop. The engine flew this 50 pound plane with no issues. I wish the software had some type of feedback system that could be used with the telemetry to give us the engine / prop rpms. I never got the engine about 70% on the throttle and she took off in less than 200 feet with no flaps. This was a great base model for my first turboprop airplane. The taildragger configuration makes it a little tricky but for a good pilot it would be no issue.
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