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Rebel Hot by Comp Arf

Old 05-03-2022, 05:57 AM
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Just trying to decide on what I put in my RH. I was thinkng of the K70G4 but for pretty much identical size I could go the X-90.
Idle thrust would be my only concern with the 90 but from what I have read maybe that wouldn't be an issue.
Old 05-03-2022, 07:12 AM
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I didn't notice residual thrust as an issue. Full flaps slow it down pretty significantly.
I put a K70-G4 in my yellow RH and it weighs slightly more than my X90 version. I didn't expect that!
I'd expect about the same performance between the two turbines. But I think the Xicoy's react faster.
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Old 05-03-2022, 04:47 PM
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Originally Posted by paulhat
Just trying to decide on what I put in my RH. I was thinkng of the K70G4 but for pretty much identical size I could go the X-90.
Idle thrust would be my only concern with the 90 but from what I have read maybe that wouldn't be an issue.
The 90 only has 3N of idle thrust, less than 1 lbs. This would not be an issue. I run a 90 in a composite HSD viper jet with no issue of getting it to slow down. When I had my first Hot it had a Jets Munt 70 and if you were not careful it would get to slow. The right flap setting is all that is required. With my first Hot I got it to the point that I knew how to adjust the flap based on the wind forecast, about a 5 deg depending on a calm day vs a day with 5 to 10 winds.

Oh as for getting a 90 the current expected delivery is September at best. Currently waiting for one, Hot take 2.

Robert
Old 05-03-2022, 08:55 PM
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Adjust the flap!?
Maximum drag, then you adjust power based on wind…
Old 05-04-2022, 12:21 AM
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I wanted to order the hab pipe and supports from hab to my x45

Is this one the correct? im ln doubt because of turbine supports as i don't know if finally i need to put it in original position or move it forward…
https://www.hab.se/bygghobby/hab-cnc...-utan-tank-x45

Bob can i ask if you have the turbine mounted more forward than standard position as the photos i can see on your install here or you have to move it reward to get correct cg?
Old 05-04-2022, 01:23 AM
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Naxto I moved my turbine forward to avoid nose weight.
Old 05-04-2022, 03:30 AM
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Originally Posted by Dave Wilshere
Adjust the flap!?
Maximum drag, then you adjust power based on wind…
I was thinking it but you went ahead and said it
Old 05-04-2022, 08:53 AM
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Originally Posted by Dave Wilshere
Adjust the flap!?
Maximum drag, then you adjust power based on wind…
Yes but, everyone does different things to make flying they way they want it. There is a very fine line when max drag and the wrong thrust setting will cause a stall and when you fly in any kind of wind that is is not steady this can happen very fast . What is right by you might be wrong by others. It worked on my first Hot and on the next Hot I will do the same.

Robert
Old 05-19-2022, 01:08 PM
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How are y’all’s stalls with the HOT? Played around with different configurations and with all hav a very nasty left wing drop. Recovery is inverted at least sometimes more. Definitely not something I want down low. Didn’t get a chance to weigh the wings yet but will. Have a bit (3mm) of up aileron with full flaps but no other. Plane is obviously trimmed and CG is on the wing tube and feels forward. My Ultra flash has similar setup but has a very benign stall.

Other than that it’s a complete blast.


Old 05-19-2022, 01:26 PM
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Don’t measure the flaps to match. Stand at the nose, deploy full flap, lean forward/backwards to sight across the top of the flaps. Do they now look the same?

My Hot has to be really provoked to stall, it just mushes
Old 05-19-2022, 01:38 PM
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Yes the flaps are perfectly rigged. The wing drop occurs in ALL flap positions. UP, T/O and land.
Old 05-19-2022, 08:47 PM
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What overall weight do you have with landing fuel in the main tank?
Old 05-20-2022, 05:45 AM
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Empty is 13.2 pounds.
Old 05-20-2022, 12:44 PM
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Originally Posted by BDK74
Empty is 13.2 pounds.
BDK74,

After reading all of what you said concerning the stall issue I would look at two things, first, I know you said the CG is good but I would double check when the Hot is in the landing configuration, gear down and remaining fuel after a flight, and maybe push it forward for one flight as a test. Second, since you say it always goes left I would set the hot a perfectly level surface and check the wing incidence from front to back and left to right at both the root and tip. There is a vey small chance that maybe one forward wing pin was not located correctly or a wing has a slight twist. If a wing is high at the leading edge on one side it would change the angle of attack and increase the drag and stall the wing sooner.

Robert
Old 05-20-2022, 05:44 PM
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Originally Posted by LimitDwn
BDK74,

After reading all of what you said concerning the stall issue I would look at two things, first, I know you said the CG is good but I would double check when the Hot is in the landing configuration, gear down and remaining fuel after a flight, and maybe push it forward for one flight as a test. Second, since you say it always goes left I would set the hot a perfectly level surface and check the wing incidence from front to back and left to right at both the root and tip. There is a vey small chance that maybe one forward wing pin was not located correctly or a wing has a slight twist. If a wing is high at the leading edge on one side it would change the angle of attack and increase the drag and stall the wing sooner.

Robert
Check the elevators too
Old 07-11-2022, 07:57 AM
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I'm an idiot. I got a Rebel Hot about 18 months ago. Worked on it and never got it ready to fly. Got it ready to fly and then the festo on the motor was leaky. Ordered new festo, installed and then it hung from the ceiling for about 4 months. Finally decided I should fly it. Holy smokes its good. Why did I take so long to fly it? It just looks and flies like a sport jet should. Precise, great knife-edge, really love it so far. Only thing that I really need to adjust is tame the elevator just a hair with flaps down. I seem to be getting a little PIO on landing flair. Not bad, just not greasing the landings like I should be.

One question, I have read in different places that you should not spin a Rebel. I'm wondering if this is true. Does it not want to come out, does it go flat? Wasn't willing to try and find out for myself. My stalls were mushy and I had to really try to get it to do an accelerated stall and even that was giving me lots of warning and never a hint of it without trying to make it protest.

Dan
Old 07-11-2022, 08:53 AM
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Mike McConville flew mine while visiting Jacksonville several months ago. Aside from the fact that he made me realize there's lots of potential left in my flying with this jet, we also discussed that very subject and he told me NOT to spin it that it was a pain to recover. I haven't tested the theory.

My buddy was flying it around so slow with the flaps down that I couldn't watch but he didn't ball it up so I learned that this thing really has an incredible flight envelope.

I did a bad thing this weekend, I flew a Rebel Pro for the first time. WOW is all I can say, it's so stable and precise. I don't want the transportation headache and fuel consumption of something that big but man it just flys BIG.
On final with the heater blowing at our jet event this weekend


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Old 07-11-2022, 10:01 AM
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I have been around a long time and know that bigger will almost always fly better. I will avoid flying a bigger Rebel.
Old 08-16-2022, 09:43 AM
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I just ordered a Rebel Hot. I have 3 K102s and don't have anything smaller. Has anyone tried a 100N engine? K85 and K102 have similar weight and dimensions.

I have a Rebel Classic with K142 and LOVE it! I fly it with 1/3 to 1/2 throttle most of the time and use full throttle for high speed pass and some verticals.

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Old 08-16-2022, 10:27 AM
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Sounds ballistic, ifs fast and has unlimited vertical with a 60, I can't imagine that with a 102
Old 08-16-2022, 11:02 AM
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There is a fellow with a M100 in his Rebel Hot. It is fast.
I use X90 and don't fly as fast as he does but I feel its the perfect turbine for the Rebel Hot.
Old 09-10-2022, 11:13 AM
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I'm about to start my Rebel Hot build. I'll use the JP gear with a xicoy gear and brake controller. It's not clear to me if I only need a better brake controller than the JP unit, or if the gyro in the LGC-15 is needed. Would you take use the new 45 euro LGC-22, or the more expensive 140 euro LGC-15 with brake gyro?
Old 09-10-2022, 11:33 AM
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I have been very happy with the Lgc22 in my Ares.
Old 09-10-2022, 05:01 PM
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Originally Posted by authomassen
I'm about to start my Rebel Hot build. I'll use the JP gear with a xicoy gear and brake controller. It's not clear to me if I only need a better brake controller than the JP unit, or if the gyro in the LGC-15 is needed. Would you take use the new 45 euro LGC-22, or the more expensive 140 euro LGC-15 with brake gyro?
Don’t even hesitate, get the LGC-15, and yes it is needed. I had one in my Mini Areas S you put on the brakes and just wait for it to stop, it works that good. Also I have a friend how has one in a Hot and the same thing put on the brakes and wait for it to stop, you can actually see it doing its thing as one brake come on and the other off. I can also say that I have JP gear in a T1 mini with a LG-13C and even with the ABS feature and the power set down low it still will pull one way or the other. Spend the money you will not be disappointed.

Robert
Old 09-10-2022, 07:22 PM
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I only have flown mine on grass. No issues with the stock controller, and the magnets are still installed. I did have to cut 5mm of the main gear spring off and then stretch it back out, it was way WAY too stiff. It came stock with the green stiff spring, I have ordered the MED red to try.

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