Kingtech JMB jets 3m PC-21?
05-25-2018, 04:57 PM
#26
Originally Posted by Neil Guildford
I hadn’t really thought about the heat issue as the turbine itself is further back in the nose. I’ll have a think and maybe just monitor it when I first run it up.
Similar issues have been reported on the Skymaster PC-21
The most common fix is heat paint and/or heat blanket
05-29-2018, 01:02 AM
#29
Originally Posted by digitech
I fly this one for over 1 year now
0 problems. , get some BVM heat shield and paint just the top of the cowling.
its fine after this.
it likes the CG a little aft , fantastic wheelys.
0 problems. , get some BVM heat shield and paint just the top of the cowling.
its fine after this.
it likes the CG a little aft , fantastic wheelys.
05-29-2018, 01:07 AM
#30
Join Date: Apr 2013
Location: holland, NETHERLANDS
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Originally Posted by Neil Guildford
Thank you for your comment. Which turbine are you using in yours?
Cause a turbo prop is on the top of my wish-list i'm really interested in operation/maintenace on this one, is this bird like an "all day" flyer, or is it one that needs tons of looking after and tweaking after every flight?
Thanks,
Ed
05-29-2018, 06:26 AM
#33
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Originally Posted by digitech
But what about the K45TP it self, painless as all the other KingTech turbines?
Have 4 till now and flying the S... out of them and they operate absolutely 100% painless, fuel and go no hassle nothing, just awesome!
I'm a bit worried that the TurboProp could give hassle witch in witch i'm really not interested cause of lacking of time to do all sorts of maintenance.
My birds are made for flying and not for F..... about cause i simply don't got the time for that.
Power wise, is the 45 enough or would you say take the 60?
Cheers,
Ed
Last edited by Midas D.; 05-29-2018 at 06:28 AM.
05-29-2018, 06:33 AM
#34
Originally Posted by Midas D.
Arggg, don't do Facebook so cannot open the link unfortunately.
But what about the K45TP it self, painless as all the other KingTech turbines?
Have 4 till now and flying the S... out of them and they operate absolutely 100% painless, fuel and go no hassle nothing, just awesome!
I'm a bit worried that the TurboProp could give hassle witch in witch i'm really not interested cause of lacking of time to do all sorts of maintenance.
My birds are made for flying and not for F..... about cause i simply don't got the time for that.
Power wise, is the 45 enough or would you say take the 60?
Cheers,
Ed
But what about the K45TP it self, painless as all the other KingTech turbines?
Have 4 till now and flying the S... out of them and they operate absolutely 100% painless, fuel and go no hassle nothing, just awesome!
I'm a bit worried that the TurboProp could give hassle witch in witch i'm really not interested cause of lacking of time to do all sorts of maintenance.
My birds are made for flying and not for F..... about cause i simply don't got the time for that.
Power wise, is the 45 enough or would you say take the 60?
Cheers,
Ed
picksup and spools up very fast...
its a no brainer just like the other Kingtech engines
45 is plenty , 60 is a no limits.
if you like sport/scale stay with the 45..
if you want unlimited vertical use the 60..
for me the 45 is spot on , and is relax to fly
06-06-2018, 09:02 AM
#38
Originally Posted by Neil Guildford
I hadn’t really thought about the heat issue as the turbine itself is further back in the nose. I’ll have a think and maybe just monitor it when I first run it up.
06-15-2018, 10:16 AM
#39
I ran the Kingtech 60TP for the first time today and it started and ran without any issues.
A problem that has become apparent is the amount of heat hitting the top of the right wing. At idle it reaches just under 100c. At higher prop speeds this reduces slightly to around 80c. I’m thinking the only way around this is to aim the exhaust down more, but not sure.
Another issue is the top of the cowl gets very hot after shut down, even after 3 coats of heatshield paint it needs a leaf blower on it for a minute to prevent it sagging.
Just these issues and the radio to program and it’s flying time.
A problem that has become apparent is the amount of heat hitting the top of the right wing. At idle it reaches just under 100c. At higher prop speeds this reduces slightly to around 80c. I’m thinking the only way around this is to aim the exhaust down more, but not sure.
Another issue is the top of the cowl gets very hot after shut down, even after 3 coats of heatshield paint it needs a leaf blower on it for a minute to prevent it sagging.
Just these issues and the radio to program and it’s flying time.
06-15-2018, 11:26 AM
#40
Just a thought Neil. Would it help if you make a wooden partition that "sits" on the fuselage deflecting the hot air from the wings. Then remove prior to flight departure. The wings should be cooler than as when flight takes place the air and propwash should dissipate the hot gases. Re-apply when the plane is again stationary.
As an aside, I often wonder what is the side and downthrust on these planes? Judging from the photos there seem to have quite a deflection.
Reuben
As an aside, I often wonder what is the side and downthrust on these planes? Judging from the photos there seem to have quite a deflection.
Reuben
06-15-2018, 12:55 PM
#41
I agree that in flight it will improve, but I would like to reduce the heat whilst it’s on the ground as the covering is already showing signs of wrinkling.
A problem with a deflection device is it won’t protect the model as it taxis to and from the runway...I could always follow it with my leaf blower
A problem with a deflection device is it won’t protect the model as it taxis to and from the runway...I could always follow it with my leaf blower
06-15-2018, 09:09 PM
#42
its a Oracover plane it will wrinkle even without the exhaust heat ;-).
dont worry so much , the heat is normal and you will suffer also from the "oanda"effect where the heat is drawn towards to fuselage in flight.
so slowly after time you will see some discolour comming.
as for the cowl ... yes it gets hot.
i always keep a high idle on the ground , and just before turning engine off , i spool up to 25% then turn it off , it will cool down much quicker.
get that bird in the air!... ;-)
dont worry so much , the heat is normal and you will suffer also from the "oanda"effect where the heat is drawn towards to fuselage in flight.
so slowly after time you will see some discolour comming.
as for the cowl ... yes it gets hot.
i always keep a high idle on the ground , and just before turning engine off , i spool up to 25% then turn it off , it will cool down much quicker.
get that bird in the air!... ;-)
06-18-2018, 07:29 AM
#45
After comparing the angle of the pipes on both sides I realised the right side was angled slight down. Taking into account the prop wash, I’ve adjusted this to now sit slight up and the heat to that wing is greatly reduced.
Attached are a few photos of the cowl locks I’ve used to secure the canopy.
Attached are a few photos of the cowl locks I’ve used to secure the canopy.
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F190Pilot (05-06-2020)
06-22-2018, 01:29 AM
#48
The maiden flight was carried out successfully and five further flights on the same day.
The power from the k-60 TP is a very good match but there is an issue withthe idle thrust being too great with the 24x22x3b. I tried lowering the rpm settings on the Kingtech but this resulted in shutdowns when running up from idle so I set it back to 55,000. At idle, the model will move forward, which also causes problems bleeding off speed on landing approaches.
The cowl was still very, VERY, hot after shutdown and the five coats of BVM heatshield paint had blistered away from the cowl and was hanging like a balloon in one section. I’ve added some inlet scoops to assist as air out shouldn’t be an issue with that provided by the large nose gear opening.
A friend who wasn’t familiar with video cameras captured some footage of the 2nd flight which I will upload later.
The power from the k-60 TP is a very good match but there is an issue withthe idle thrust being too great with the 24x22x3b. I tried lowering the rpm settings on the Kingtech but this resulted in shutdowns when running up from idle so I set it back to 55,000. At idle, the model will move forward, which also causes problems bleeding off speed on landing approaches.
The cowl was still very, VERY, hot after shutdown and the five coats of BVM heatshield paint had blistered away from the cowl and was hanging like a balloon in one section. I’ve added some inlet scoops to assist as air out shouldn’t be an issue with that provided by the large nose gear opening.
A friend who wasn’t familiar with video cameras captured some footage of the 2nd flight which I will upload later.
06-22-2018, 01:36 AM
#49
Get a Ramoser prop , out performes everything...
5 blade and scale and you can set pitch , engine runs cooler , and more torque.
this thing can really go slow , make sure your CG is correct. on the tube or just in front.
set flaps at maximum , use Crow like i did , raise Ailerons 10mm each side.
even with 25% throttle i can set it down with less then 30kmh ...
you can see in my video thats with 25% throttle..
BTW : Did you open the cowling on the underside? where the wheel retract sits? this makes a HUGE difference.
you need to draw the heat out of somewhere.
5 blade and scale and you can set pitch , engine runs cooler , and more torque.
this thing can really go slow , make sure your CG is correct. on the tube or just in front.
set flaps at maximum , use Crow like i did , raise Ailerons 10mm each side.
even with 25% throttle i can set it down with less then 30kmh ...
you can see in my video thats with 25% throttle..
BTW : Did you open the cowling on the underside? where the wheel retract sits? this makes a HUGE difference.
you need to draw the heat out of somewhere.
Last edited by digitech; 06-22-2018 at 01:39 AM.
06-22-2018, 02:09 AM
#50
No, I haven't cut the underside of the cowl because I couldn't see how air was getting past the turbine from here. Can you please show me where you cut yours?
Are you using the K-45? Do you think this might be why I am having the extra heat issues?
Are you using the K-45? Do you think this might be why I am having the extra heat issues?
