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HelicopterAutogyros - Gyrocopters › PT 25 Autogyro
04-22-2013 12:20 AM  4 years agoPost 1
Raptor Pilot

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Northern Ireland U.K

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Hi guys, has anybody on here built and flown one of the flying balsa PT 25 autogyros? I have one almost completed and wondered what they are like to fly as I have heard so many different story's about autogyros. I fly aeroplanes and helicopters so im hopeing I wont have too much trouble with it.
Orientation seems to be the most talked about problem which leads to crashing the model, im hopeing the helicopter experience I have will help out here as it kind of looks like a helicopter.
So, any tips or experiences you have of this model I would like to hear about them before I do the maiden flight.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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04-27-2013 11:45 PM  4 years agoPost 2
Raptor Pilot

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Northern Ireland U.K

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The deathly silence must mean nobody has any experience of this model, surely somebody is bound to know something?

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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05-02-2013 06:15 PM  4 years agoPost 3
Intrepid175

Heliman

Texas City, TX

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Hi RP,

I've got precious little experience with RC autogyros but I have looked into the larger versions that are built as experimental aircraft and a person actually gets into to fly. I even bought an hours flight instruction in one out of curiosity. Autogyros are interesting aircraft that have similarities with both fixed wing and rotary wing aircraft. The only problem is, they don't really fly like either one. That's not a bad thing, it's just that they have their own set of rules that set them apart from both fixed and rotary wing flying machines. If you're experienced enough with helicopters to not have orientation issues with them, then I doubt you'll have any problems with an RC autogyro. I think that's the main thing fixed wingers struggle with when they try one. One of the biggest challenges, at least at first, it getting the main rotor up to speed. I've seen some model autogyros that have a separate electric motor to pre-rotate the main rotor before take off and that's not a bad way to go. Without it, you'll need a fair amount of space to taxi and spool the rotor up to flight rpm gradually. A nice head wind will help a lot with that. One mistake I think modelers make is trying to rush the process. If you go too fast at first, before the rotor is spooled up enough to take it, you'll just be hauling arse across the ground without building rotor speed. The models can get away with that. The bigger versions will let the pilot know it's unhappy right away with a process called mast bumping. If they continue to push it, it can lead to really neat things happening, like the main rotor separating itself from the main mast. Cool, huh! :-) Forcing the model off the ground with too slow a rotor rpm will usually lead to an uncontrolled roll toward the retreating side of the disk. From what I've seen of them, when they're ready, they'll come off the ground with no problems. I'd do as much reading on them as possible before attempting to fly one. There's lots out there and Google is your friend!

Hope this helps a little.

Good luck & Fly Safe,
Steve R.

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05-02-2013 11:16 PM  4 years agoPost 4
Raptor Pilot

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Northern Ireland U.K

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Hi Steve,
thanks for all that info. Getting the main rotor up to speed seems critical, not enough rotor rpm and the model does an uncontrolled roll like what you said, I have seen it in videos on you tube. I have heard of mast bumping in full size helicopters and sometimes the main rotor disc separates from the fuselage with fatal results.
Also like what you said about takeing off, when they're ready, they'll come off the ground just like a model aeroplane with no problems at all. That's the way im hopeing my test flight will go when I get it finished.
Your reply has been a great help, many thanks.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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05-03-2013 02:48 AM  4 years agoPost 5
slickporsche

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American/Philippines

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Raptor Pilot

Got any pics of this auto gyro?

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05-03-2013 05:29 AM  4 years agoPost 6
Intrepid175

Heliman

Texas City, TX

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05-03-2013 07:03 PM  4 years agoPost 7
Raptor Pilot

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Northern Ireland U.K

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Got any pics of this auto gyro?
Not yet but I will try and get some soon and upload themThat looks like a pretty docile autogyro, it flies its self off when its ready, that's what im likeing to see!

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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05-05-2013 09:18 PM  4 years agoPost 8
Raptor Pilot

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Northern Ireland U.K

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Got any pics of this auto gyro?
Yes I finaly got round to takeing a couple, I still may put some coloured trim down the side of the fuselage but here she is anyhow.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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05-05-2013 09:43 PM  4 years agoPost 9
Intrepid175

Heliman

Texas City, TX

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Very cool RP. I agree! I think I'd put some kind of contrast color on the side of the fuse. It would help with orientation. You might also consider putting some stripping tape on the rotor blades to break the rotor disk up a bit but that's not that big a deal.

The aircraft does look decently docile in the video. The only thing I noticed is that it seems to want a fair amount of power on landing. His landings definitely dropped in "firmly" at the power setting he was at. If you loose an engine, you'll really need to keep the nose down and the airspeed up so the flare will have some level of effectiveness. Since there's no collective, you've got no way to cushion the touchdown otherwise. I've watched the full size versions many times and I've seen them do engine off, or engine idled landings. The approach angle is quite steep but they round out nicely in the flare and touch down with little or no ground roll. "Normal" approaches almost always carry some power until the last couple of inches before landing.

Best of luck with your maiden flights. Let us know how it goes!

Fly Safe,
Steve R.

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05-05-2013 11:10 PM  4 years agoPost 10
Raptor Pilot

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Northern Ireland U.K

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Thanks Steve. The thought of some stripping tape on the main rotors sounds cool, I like the effect it has on fullsize helicopters when you see the rotor disc in a banking turn, it would also help with seeing the model! I have a bit of black tape on one blade purely for balancing purposes.
I will let yous know how the maiden flight goes.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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05-06-2013 12:49 AM  4 years agoPost 11
turboomni

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East of the Equator

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Best on Your Maiden Raptor Pilot!!

If there is any advice it is when flying always keep feeding the underside of that rotor head with air.!! Think of it like you are pulling an umbrella and want to keep it full of air with your forward walking motion or propeller.If you tuck that rotor head and air travels from the top to the bottom it will sloww very quickly!! No yank and bank either!! If turning left for example use left rudder but aileron should be used to keep from banking too hard. In most cases In a left turn I will use right airleron and some up elevator too keep level and sustain altitude and keep the rotor fed with air. It is not hard ,,it is just very different! Good luck!!

Setup is everything, All my heli's can fly far better than I can pilot them

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