SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
10-14-2005, 05:28 AM
#52
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
dont worry they are a doddle to fly. shutting the turbine off to land is good advice but wait till you are used to the model otherwise you may over or undershoot. just be prepared for a few bumps on landing. if you set the nose wheel low so when it is sat on the ground the aircraft is at a negative angle of attack it will land better with no bounces.
10-14-2005, 05:09 PM
#55
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
ORIGINAL: SALMONBUG
is houston far away from kampenhout (Belgium europe) [:-][:@][
]
is houston far away from kampenhout (Belgium europe) [:-][:@][
]
10-14-2005, 05:20 PM
#56
RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
ORIGINAL: shout out devil
like an air brake, is that what you mean by aeorpdynamic brake?
like an air brake, is that what you mean by aeorpdynamic brake?
10-14-2005, 05:50 PM
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
oh ya i see. thats was what i was going to do because its a huge delta wing. but im going to but some electromagnetic barkes on there. (saves room, rather haveing a air system)
10-15-2005, 03:46 AM
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
SALMONBUG and Shout out Devil
I think SALMONBUG is absolutely correct. From what I have heard - brakes underneath and on top of the fuselage are largely ineffective, as are contrary moving twin rudders.
However there is one mod that I have given thought to. Given a wing rebuild - I would extend the elevons towards the root and increase their chord as you approach the fuselage. This would add authority to the elevons and enable better control at high angles of attack for example when landing. On the basis of learning from the Eurosport, I would make the chord at the root about 2.5 times that of the tip. You would need a good strong servo (10Kg/cms - say a JR8114?) and probably cover it in glass cloth or thin ply to achieve torsional stiffness. You probably need to move the servo so it acts on a line giving equal areas of elevon on either side - say 1/3rd of the span from the fuselage.
Perhaps some one has tried this already and can give practical feedback. However I would predict easier slower landings and more exciting aerobatics. If someone has tried a 12-16Kg thrust turbine, I would suggest trying this mod as well as I think it would tame a fairly frightening beast!
I think SALMONBUG is absolutely correct. From what I have heard - brakes underneath and on top of the fuselage are largely ineffective, as are contrary moving twin rudders.
However there is one mod that I have given thought to. Given a wing rebuild - I would extend the elevons towards the root and increase their chord as you approach the fuselage. This would add authority to the elevons and enable better control at high angles of attack for example when landing. On the basis of learning from the Eurosport, I would make the chord at the root about 2.5 times that of the tip. You would need a good strong servo (10Kg/cms - say a JR8114?) and probably cover it in glass cloth or thin ply to achieve torsional stiffness. You probably need to move the servo so it acts on a line giving equal areas of elevon on either side - say 1/3rd of the span from the fuselage.
Perhaps some one has tried this already and can give practical feedback. However I would predict easier slower landings and more exciting aerobatics. If someone has tried a 12-16Kg thrust turbine, I would suggest trying this mod as well as I think it would tame a fairly frightening beast!
10-17-2005, 02:38 AM
#61
RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
my reaper is fitted with heavy duties servos hitech, analogic ones and with a pcm receiver. I believe that digital servos are not a must, either they can have a excelent neutral tracking, my opinion is that we (the human) are not computers 
.
my reaper as emergency turbine kill device ( power cuttof on the ecu), it's a must in my opinion, either the belgian regulation doesn't require it
.my reaper as emergency turbine kill device ( power cuttof on the ecu), it's a must in my opinion, either the belgian regulation doesn't require it
10-17-2005, 07:26 AM
#62
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
I can tell you from personal experience that the rudder brakes are both effective and worthwhile, especially if you are using a larger turbine. They are easy to set up and do not require anything extra to do, if you have the right radio.
Tommy
Tommy
10-17-2005, 04:23 PM
#64
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
It requires you to plug the rudders into individual channels, so in reality you will use three spots in your reciever (rudder, aux1 and aux2). You will have to find it in your manual the specifics, or email the reps. I got my information from JR on how to do it with my 9303. It requires aboubt 3 mixes, but once you get it done it is simple to implement.
Tommy
Tommy
10-18-2005, 09:03 AM
#66
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
As you are probably aware Salmon, here in the US the AMA requires all turbine aircraft to have functional rudders. I won't debate with you whether or not they are needed, but from my experience if you are using a higher thrust turbine (above 14 pounds, 6 kg) you WILL find them very useful since the residual thrust of the turbine will cause the Reaper to fly right on by you, and this OP is wanting to land on a football field. Your other option is to just shut down the turbine, but if you do not want to risk that, the functional rudder brake is an excellent option.
Tommy
Tommy
01-08-2009, 04:31 AM
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
After a few years (strange how time flies) I am soon ready for the first flight for my Reaper 
but I´m a little bit worried about the weight, it is a tad over 20lb/9,2kg witout fuel 
will that be to heavy ?
Another problem is the mixed canards to the elevator. To get 20mm throw on the ailerons I have to use 50% dualrate on the elevators. Unfortunatly that dualrate also effects the slaved canards so that their travel is reduced to only 15mm.
If I dont use the dualrate, I get 30mm on the canards, but also get 22mm on the elevator [] wich is twice the recomanded throw.
The canards ar on the 5th and 7th chanel on my Graupner MC-24
Any advice or solutions ?
Thanks.
Best regards from Gandalv
but I´m a little bit worried about the weight, it is a tad over 20lb/9,2kg witout fuel will that be to heavy ? Another problem is the mixed canards to the elevator. To get 20mm throw on the ailerons I have to use 50% dualrate on the elevators. Unfortunatly that dualrate also effects the slaved canards so that their travel is reduced to only 15mm.
If I dont use the dualrate, I get 30mm on the canards, but also get 22mm on the elevator [
] wich is twice the recomanded throw.The canards ar on the 5th and 7th chanel on my Graupner MC-24
Any advice or solutions ?
Thanks.
Best regards from Gandalv
01-08-2009, 07:42 AM
#73
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
Dont worry about the weight of the reaper. Mine came in at 24 lbs and flew great, still had problems with floating.
with the servo travel I would get the most you can out of the ailerons, but the canards arent really needed unless you fly from a short field or using them with a crow function.
with the servo travel I would get the most you can out of the ailerons, but the canards arent really needed unless you fly from a short field or using them with a crow function.
01-08-2009, 12:09 PM
#74
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
ORIGINAL: jetsett..............
with the servo travel I would get the most you can out of the ailerons, but the canards arent really needed unless you fly from a short field or using them with a crow function.
with the servo travel I would get the most you can out of the ailerons, but the canards arent really needed unless you fly from a short field or using them with a crow function.
Thx jettsett
good to hear that the weight is ok and that I can do without max travel on the canards
I will try to fly with the canards, hope that I can get some AOA on the landings to slow it down.
Just to be on the safe side, do you mean the most out of the ailerons-travel (not elevators since that was my asking)? So Reaper its a slow roller
Once again, thanks
01-08-2009, 09:00 PM
#75
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RE: SUPER REAPER MAIDEN FLIGHT SOON NEED ADVISES
At high AoA you can get tip stalling which translates into a large displacement rolling motion back and forth. I've heard of a couple of other Reapers doing this.. I am going to do some mods to the wing tips to try and get rid of this...
We (my buddy and I) had full flying canards up near the pointy end. I found adding elevons as well made it way too pitch sensitive. The Canards were limited to 13 degrees up and down. Rudder brakes work well, and there is no pitch change when they are deployed. The photo below shows it just after touchdown with full up elevator (canard) and full rudder braking... you'll also notice that the elevon mix is turned on because my son was flying it......
We (my buddy and I) had full flying canards up near the pointy end. I found adding elevons as well made it way too pitch sensitive. The Canards were limited to 13 degrees up and down. Rudder brakes work well, and there is no pitch change when they are deployed. The photo below shows it just after touchdown with full up elevator (canard) and full rudder braking... you'll also notice that the elevon mix is turned on because my son was flying it......