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Alpha 2.8 TJIRC (AKA, TJIRC Great Wall 2.8m)
- Thread starter Konrad
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- alpha 2.8 f3f great wall tjirc
Doc James Hammond
Very Strong User
Hi Konrad, I'm pretty sure the Alpha fuse is a more or less direct copy of the Typhoon, using an RCRCM Typhoon fuse as the master in a parting board mould. There was a version with an extended nose but I'm not sure what other mods. I think it started with the "Dream" at 2M then got its wings extended.
As I have said before though, Jerry at least did have the politeness to ask me before doing the rip off.
I love it!
Cheers,
Doc.
Konrad
Very Strong User
The 2meter Alpha 2 looks to be a real close copy of the Typhoon.
The Alpha 2.8 looks to be a model built on a different philosophy. I don't know if it is a copy of anything. It does have a noticeably shorter nose and longer tail than the Redshift. It does have a slightly shorter nose and slightly longer tail than the Strega. Different tail and nose cone and different V tail mount.
The Alpha 2.8 looks to be a model built on a different philosophy. I don't know if it is a copy of anything. It does have a noticeably shorter nose and longer tail than the Redshift. It does have a slightly shorter nose and slightly longer tail than the Strega. Different tail and nose cone and different V tail mount.
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Doc James Hammond
Very Strong User
Sorry, Konrad - I have not actually laid eyes on any of them, and looking a bit more closely you may be right. I know for sure the 2M ancestry as it came from me and later I did go for longer noses after the Typhoon which I always though could to with another 30 to 40mm.
Not actually sure where the V-Tail 2.8 came from now, but to my biased eyes it looks slightly out of proportion, but anyway it works apparently.
Is it possibly an RCRCM P2 adaptation? Looking at the wing planform, it could be.
Cheers,
Doc.
Konrad
Very Strong User
For V-tails I like the shorter nose. I hope that V-tails for the same control power will be lighter than a cruciform tail.
Properly sized V-tail do look oversized if one is use to the projected area theory. But I do like ships that track well.
You're going to send me RCRCM's web site?
Properly sized V-tail do look oversized if one is use to the projected area theory. But I do like ships that track well.
You're going to send me RCRCM's web site?
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Doc James Hammond
Very Strong User
Yes, ignore the Alpha name on both the 2 and 2.8 meter planes from TJI, this is a name we use at Aloft as I hated TJI's names. Generally do no change names, but hated Dream and Great Wall. Alpha was a good name and just decided to use the same name and paint scheme on both of these planes. The 2.8 seems to be a pretty modern design and seems to be well liked by folks for the price. Hard to argue with that.
I need them to make a glider fuse for the little pylon racer, it is a pretty sweet little plane.
-Wayne
I need them to make a glider fuse for the little pylon racer, it is a pretty sweet little plane.
-Wayne
I've been flying a 'Great Wall' for a good few months and can report on its character. I used Servorahmen frames and IDS along with Kingmax servos in wings (from Flightech, I'm in the UK) and have plenty of fast, slop-free movement and long travel on flaps for great control on landing. After a while I fitted servos with linkage inside the tail and did away with servos in the nose and the long pushrods, works really well with zero issues. Flies like a dream and it's quick. For ballast I use brass in the round wing holes, nearly 300gm total, and steel in the joiner, about another 600gm. CG around 97-98mm behind leading edge is neutral.
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The photos above were taken while fitting the servos into the fins but after they were fitted and working I realised that it is better to have the servos, wiring and linkage attached to the fuselage rather than the tails. The fixture of the tails seemed firmer after the fitting also. The ball joint needs pulling off the ball before a tail is removed but then it pulls straight out. I like the little JX servos I used in the tails by the way, they are HV for 2S, dual ball bearing, quick and strong enough for elevator and perhaps ailerons, thin and don't cost much! I'll pull a fin off tomorrow and take a photo to show the servo sticking out from the rear of the fuse.
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Konrad
Very Strong User
Thank you! That's what I wanted to see.
I too have used those servos in my low emotional ships. I use to use them in my 60" racers as I didn't expect them to have a long life. But over a short period of time I've been seeing a lot of gear back lash develop.
I won't build a new ship with those. But at the same time I'm not going to pull them out of the ships I have them in. Besides I think the market place has voted on these as they aren't available.
I too have used those servos in my low emotional ships. I use to use them in my 60" racers as I didn't expect them to have a long life. But over a short period of time I've been seeing a lot of gear back lash develop.
I won't build a new ship with those. But at the same time I'm not going to pull them out of the ships I have them in. Besides I think the market place has voted on these as they aren't available.
Perhaps you worked them too hard in your ships, they are going strong in my gliders 
Dont know where you bought your JX PDI-HV0903MG but Banggood is where mine came from and they are available.
By the way the Chinese graphics on the wing say 'Chang cheng' which means 'great wall'.
Dont know where you bought your JX PDI-HV0903MG but Banggood is where mine came from and they are available.
By the way the Chinese graphics on the wing say 'Chang cheng' which means 'great wall'.
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Konrad
Very Strong User
I got my 3 sets (18+) from Aloft and Hobby King. I avoid Amazon and Banggood. I know I should and do try to avoid HK.
I too first thought that these 9 gram, 8mm, HV, MG servos would be great in the smaller gliders. But they just haven't stood up. They aren't so bad as to have me smash them with a hammer. But I won't set up new gliders with these. My modlies cost too much to be cripple by their performance with poor gearing/centering.
I too first thought that these 9 gram, 8mm, HV, MG servos would be great in the smaller gliders. But they just haven't stood up. They aren't so bad as to have me smash them with a hammer. But I won't set up new gliders with these. My modlies cost too much to be cripple by their performance with poor gearing/centering.
I had to look up the JX wing servos. The JX PDI-HV0903MG and its bigger siblings PDI-HV2107MG and 2105 (non HV) seem like unbelievable value. Too good to be true?
I will probably go with KST X10 servos in the wings. Undecided about placing servos in the tail or using the servo tray.
Redbird, your installation looks clean! You mention attaching the servos to the fuselage, do you mean keeping the same position/orientation of the servos, only fixing them to the fuselage tail instead of gluing them into the tail fins?
I will probably go with KST X10 servos in the wings. Undecided about placing servos in the tail or using the servo tray.
Redbird, your installation looks clean! You mention attaching the servos to the fuselage, do you mean keeping the same position/orientation of the servos, only fixing them to the fuselage tail instead of gluing them into the tail fins?
Einar, thanks, it seems to do the job well. You've got it with the servo fixing. The servos are not that cheap! Plastic case must help. I wouldn't task them with racing ailerons in a mouldie (though the PDI-HV2107MG could be alright) but they are the right size, speed and power for the tail mounting and I find they centre well. I am using them with four wires for the pair, 22 guage I think. I have a pair in the nose of a Mini Q as well.
Konrad, feel free. Good luck with the short servo arm.
I'm off to get the photo I promised...
Konrad, feel free. Good luck with the short servo arm.
I'm off to get the photo I promised...
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