Rebel Hot by Comp Arf
#1201

Here is mine, finally RTF after a long and slow build. I started it before Christmas last year.
It's set up with my old and trusted VT-80 BL with about 28 hours on the clock, donated form my now retired Xcalibur. JP gear with Xicoy LGC-15 controller. All Kingmax CLS2875H servos that I belive is identical to the MacGregor MG2810HV. Jeti REX 10 Assist RX. 4OZ air trap from Zedjet. Original tank, but with a top mounted vent line. Original pipe.
I had to change out the included clevises to MP Jet, the included clevises had 1.4mm pins, and the holes in the control horns are drilled for 1.6mm pins. That's pretty much the only complaint I have with the kit.
I changed the front tyre form the included 50mm to a 55mm, it fits the original rim and strut, and gives me a bit more peace of mind flying off grass. I also used some 3mm packers made of ply under the front gear, lifting the nose a total 5.5mm giving it a slightly more nose up attitude on ground. I also turned the motors on the main retracts around, giving more clearance for the wire for the retract motors now clearing the former in the wing without removing any wood.
I've set the model up with a single battery, and it balances at the back of the wing tube with 1/3 fuel and UAT full, with a 3300mAh lipo and 20g lead taped to the battery. I'll probably get a 4000mAh battery to get rid of the lead, and to allow for one more flight per charge. From previous experience 3300mAh is comfortable for 3 flights, and 4000mAh allows 4 flights. This takes around half out of the battery.
I guess I'll maiden the model over the next month or so, work and weather permitting.







It's set up with my old and trusted VT-80 BL with about 28 hours on the clock, donated form my now retired Xcalibur. JP gear with Xicoy LGC-15 controller. All Kingmax CLS2875H servos that I belive is identical to the MacGregor MG2810HV. Jeti REX 10 Assist RX. 4OZ air trap from Zedjet. Original tank, but with a top mounted vent line. Original pipe.
I had to change out the included clevises to MP Jet, the included clevises had 1.4mm pins, and the holes in the control horns are drilled for 1.6mm pins. That's pretty much the only complaint I have with the kit.
I changed the front tyre form the included 50mm to a 55mm, it fits the original rim and strut, and gives me a bit more peace of mind flying off grass. I also used some 3mm packers made of ply under the front gear, lifting the nose a total 5.5mm giving it a slightly more nose up attitude on ground. I also turned the motors on the main retracts around, giving more clearance for the wire for the retract motors now clearing the former in the wing without removing any wood.
I've set the model up with a single battery, and it balances at the back of the wing tube with 1/3 fuel and UAT full, with a 3300mAh lipo and 20g lead taped to the battery. I'll probably get a 4000mAh battery to get rid of the lead, and to allow for one more flight per charge. From previous experience 3300mAh is comfortable for 3 flights, and 4000mAh allows 4 flights. This takes around half out of the battery.
I guess I'll maiden the model over the next month or so, work and weather permitting.







#1202


Thanks for sharing your build pics.
So I'm interested in the single battery idea.
I would like to use 2 rather than one but i guess its a similar philosophy. I would have one running retracts, turbine and 1 input to a regulator.
The other smaller battery would run the other side of the regulator.
Have you tried a single battery setup on this type of jet before? Any issues?
It would be interesting to put each piece of equipment (brakes, turbine ecu, powerbox, gyro and whatever else) on an oscilloscope and see which one has the noisiest line side power.
Then connect everything up and see if the THD has increased at all.
Noise would be my only concern running one or two batteries only.
Paul.
So I'm interested in the single battery idea.
I would like to use 2 rather than one but i guess its a similar philosophy. I would have one running retracts, turbine and 1 input to a regulator.
The other smaller battery would run the other side of the regulator.
Have you tried a single battery setup on this type of jet before? Any issues?
It would be interesting to put each piece of equipment (brakes, turbine ecu, powerbox, gyro and whatever else) on an oscilloscope and see which one has the noisiest line side power.
Then connect everything up and see if the THD has increased at all.
Noise would be my only concern running one or two batteries only.
Paul.
#1203

Hi, thanks for your interest. Yes, I've used single battery before, in only slightly smaller models. One being the sebart mini avanti, the other being a E-flite 90mm Viper converted to turbine. They were not perfectly equal to this one, on those I had to use a 3S LiFe for the king tech turbine, and a CC BEC Pro regulator for the RX and gear.
I've debated with myself using only one, or two batteries:
I've not had any noticeable problem with noise running a single battery in my other models, but as mentioned, that was with a different turbine and a regulator for RX.
I've debated with myself using only one, or two batteries:
- Using two separate batteries for RX/gear and turbine, the most likely scenario loosing any of the two batteries would be loosing the jet. I could be lucky and save it if the turbine battery died. It is less likely that a single battery fails, compared to how likely it is that one of two batteries fail.
- Using two batteries through something like the AR multi switch could remedy the above. Then again, how likely is it that the multi switch fails? I don't know.
I've not had any noticeable problem with noise running a single battery in my other models, but as mentioned, that was with a different turbine and a regulator for RX.
#1204
Member

Hi fellow flyers,
Thanks for the pics.
I personally would _never_ fly a jet on single battery. Ever. In my opinion, double-up on everything you can, weight and space permitting.
One very simple solution is to use Jeti DSM10 which allows use of 2 batteries and provides basic failsafe. It also supports RCSW, so it can be turned on/off by Jeti Tx.
Thanks for the pics.
I personally would _never_ fly a jet on single battery. Ever. In my opinion, double-up on everything you can, weight and space permitting.
One very simple solution is to use Jeti DSM10 which allows use of 2 batteries and provides basic failsafe. It also supports RCSW, so it can be turned on/off by Jeti Tx.
#1205

Hi fellow flyers,
Thanks for the pics.
I personally would _never_ fly a jet on single battery. Ever. In my opinion, double-up on everything you can, weight and space permitting.
One very simple solution is to use Jeti DSM10 which allows use of 2 batteries and provides basic failsafe. It also supports RCSW, so it can be turned on/off by Jeti Tx.
Thanks for the pics.
I personally would _never_ fly a jet on single battery. Ever. In my opinion, double-up on everything you can, weight and space permitting.
One very simple solution is to use Jeti DSM10 which allows use of 2 batteries and provides basic failsafe. It also supports RCSW, so it can be turned on/off by Jeti Tx.
#1209


If you are going to use the Jeti built in gyro do lots of ground testing the Rebels I have seen with that twitched and jittered because of the turbine emf.
I have 2700 2s li-po in the nose, the two 1350. 2s Li-Po Rx packs next to the tank and a 800mAh 2s Retract pack in the turbine opening.
I have 2700 2s li-po in the nose, the two 1350. 2s Li-Po Rx packs next to the tank and a 800mAh 2s Retract pack in the turbine opening.
#1210

Is that all the battery you have in the model, or is that radio only with an additional battery for turbine and gear?
With a 3S 2200mAh LiFe in my other models with a single battery, I put approximately 1200mAh back after 3 starts on the K45G3 and 3 flights.
Edit; I saw Dave’s post now. Yes, lots of testing, had that on my e-flite viper.
With a 3S 2200mAh LiFe in my other models with a single battery, I put approximately 1200mAh back after 3 starts on the K45G3 and 3 flights.
Edit; I saw Dave’s post now. Yes, lots of testing, had that on my e-flite viper.
Last edited by authomassen; 03-13-2023 at 10:36 AM.
#1211


Hi Barracuda,
Do you run the retracts and turbine off those 2 batteries as well?
Paul.
Do you run the retracts and turbine off those 2 batteries as well?
Paul.
#1213

How many flights can you get on the single 5000mAh?
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authomassen (03-14-2023)
#1215


It’s not the battery that fails, like you say it’s rare without warning. But if say one items fries, it will take down the radio…it will fly without a turbine and with the gear up…but free flight jets are rubbish. I think it’s a stupid risk. I only charge my Turbine battery between most sessions, Rx and gear lasts several sessions…
It’s like people who are always on FB saying they don’t have time in their lives to do something…
It’s like people who are always on FB saying they don’t have time in their lives to do something…
#1219


No, it’s our National Flying Centre (Muncie type) but we have a few acres and a grass 900’ sloped take off strip. Problem was very wet ground, longish grass and 30 degree cross wind that day.
That was last weekend JMA event, we have 3 per year there

That was last weekend JMA event, we have 3 per year there

#1220

Join Date: Aug 2010
Location: Berkshire, UNITED KINGDOM
Posts: 105
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6 Posts

Currently putting together a ARF plus version, and noticed that carf have mounted the thrust tube with a small amount of down thrust, which means I will need to pack my turbine to centre it, its a xicoy 85 so the mount is on the centre line, I had one before which I mounted the thrust tube and turbine all on the centre line and it flew great, I have looked through the posts here and I can't see any packed turbines, anyone else have a arf and noticed this ??? Dave W says they should have a small amount of down thrust so pack it, but just curious what you guys have noticed ?
#1222

My Feedback: (1)

Currently putting together a ARF plus version, and noticed that carf have mounted the thrust tube with a small amount of down thrust, which means I will need to pack my turbine to centre it, its a xicoy 85 so the mount is on the centre line, I had one before which I mounted the thrust tube and turbine all on the centre line and it flew great, I have looked through the posts here and I can't see any packed turbines, anyone else have a arf and noticed this ??? Dave W says they should have a small amount of down thrust so pack it, but just curious what you guys have noticed ?
I have the same setup, X90 & CARF pipe in my Rebel Hot. The turbine is bolted flat to the wood framing. The pipe sits on the back supports without modifications. I screwed the pipe bell to the former (bulkhead) so it was centered on the turbine exhaust nozzle. It appears that the thrust line is parallel with the fuselage center axis.
It flies perfectly.
It is hard to say if you will have the same experience, since there seems to be minor variations in construction from the CARF factory.
Best regards-
#1224
Member

Final steps to maiden, are those deflections posted at beginning of this thread, measured at surface root or end?
Deflections /
Elevator: "nose up" / "rudder": 12 mm
Elevator: "nose down" / "deep groove": 9 mm
(Elevator has a slight "nose up" / "height" in neutral, maybe 1 mm)
Aileron (differential): Up 9 mm / down 6 mm
Rudder: max deflection
Flaps, take off: 23 mm
Flaps, landing: 68 mm
- --- Crow @ landing flaps: 8 mm
---- Elevator @ landing flaps ("nose down" / "dykror") 4 mm
CG at 187 mm (from front leading edge) gear down, 25% fuel
Elevator: "nose up" / "rudder": 12 mm
Elevator: "nose down" / "deep groove": 9 mm
(Elevator has a slight "nose up" / "height" in neutral, maybe 1 mm)
Aileron (differential): Up 9 mm / down 6 mm
Rudder: max deflection
Flaps, take off: 23 mm
Flaps, landing: 68 mm
- --- Crow @ landing flaps: 8 mm
---- Elevator @ landing flaps ("nose down" / "dykror") 4 mm
CG at 187 mm (from front leading edge) gear down, 25% fuel
#1225


Look terrible. Differential wrong way for a start. Don’t recommend CROW on a Hot, it’s heavily loaded to start with.
I’m sure there are other figures in this thread…
I’m sure there are other figures in this thread…