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RE: ThunderTiger Rare Bear - 7/3/2007 8:15 AM   
Sessholvlaru



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From: West Caldwell, NJ, USA
Status: offline 		Well, I decided to look at the exact prop I have on it....is it a 15.75 x 13! No wonder why it was not running anywhere near full rpm. I remembered that this prop was the only 3 blader my lhs had in stock. Shame...the APC is prettier than the MA and it looks as if the spinner was cut for this very prop.

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RE: ThunderTiger Rare Bear - 7/4/2007 6:38 AM   
Dave G



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From: St Augustine, FL, USA
Status: offline 		Sessholvlaru, that's a shame about the dead-stick and a real pisser about the mechanical retract servo not having enough umph. Wonder if that servo would work on 6 volts? I have some 3-1/4" thin foam wheels that I intended to use, but if the purpose built servo can't handle your's I'm not sure what's up. I am using the Futaba 180 degree retract servo and the gear seam to cycle on the bench fine. I may throw a 6 volt battery in the system just to see if the servo operates.

For this model, I'm staying away from air retracts. Too much extra weight.


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RE: ThunderTiger Rare Bear - 7/4/2007 6:42 AM   
Sessholvlaru



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From: West Caldwell, NJ, USA
Status: offline 		Well worse news today. Both elevator halves left the stab after a dive. Plane went into the weeds hard, but is not too badly damaged. I think I might just save up for another and use this one as a spare. I beefed up the stabs, moved the servo to the rear and sealed the gaps. Most of the CA hinges broke in half while two pulled out. I am guessing that Ace cannot help me with this issue, but I guess it can't hurt to inquire. Now I know to use Robarts instead. A real shame...second flight and I was really starting to love the plane. Oh well. I am uploading some pics and video of it in the crash forum.

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RE: ThunderTiger Rare Bear - 7/4/2007 6:59 AM   
Dave G



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From: St Augustine, FL, USA
Status: offline 		Man, that's too bad. Sorry. Hopefully, you'll have another in the air soon.

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RE: ThunderTiger Rare Bear - 7/4/2007 7:40 AM   
reincarnate


 

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quote:

Now I know to use Robarts instead.


Is there sufficient hardwood to accept the Robart hinges? I've been eyeballing this plane for a while, and now that you guys seem to have most of the kink's worked out...

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RE: ThunderTiger Rare Bear - 7/4/2007 10:24 AM   
jfetter


 

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quote:

ORIGINAL: reincarnate

quote:

Now I know to use Robarts instead.


Is there sufficient hardwood to accept the Robart hinges? I've been eyeballing this plane for a while, and now that you guys seem to have most of the kink's worked out...



reincarnate,

Run, don't walk away from this plane! I say that half-jokingly but I have one sitting upstairs, perhaps someday I'll take another whack at it but considering the mods required and the time you'll need to put into it, I'd have to say if I had it to do over again, I wouldn't...

Jack

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RE: ThunderTiger Rare Bear - 7/6/2007 1:18 AM   
Rbeav533


 

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quote:

Is there sufficient hardwood to accept the Robart hinges?


No there isn't, the trailing / leading edges of the horiz stab / elevators is ~ 4mm thick. Same issues with the wings / ailerons, but maybe 5mm thick. When I assembled my Rare Bear, I opened up the various control surfaces and added hard balsa blocks for the Robart hinges.

Rich



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RE: ThunderTiger Rare Bear - 8/20/2007 7:40 AM   
kochj


 

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Status: online 		The seafury the TT is getting out now, looks great...
The wings look quite nice and the fuse fiberglass looks well done...

a YS 110 should pull it around well...

Justin

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RE: ThunderTiger Rare Bear - 9/13/2007 10:55 AM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		Hi Guys,
I am building Thunder tiger Rare Bear, and would like to know what size 3 blade prop should I use. I am not sure about the engine but I might opt for OS 91 or OS 120 AX in Rare Bear. Please suggest appropriate prop size for both the engines.
Thanks
Asif

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RE: ThunderTiger Rare Bear - 9/13/2007 12:00 PM   
lil-redrex


 

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From: WestAust, AUSTRALIA
Status: offline 		Hi

I have a 91 and are running a 12x8 (3-blade) and seems a good combo for the motor. Doesnt quite look scale, but if you want a bigger prop your going to need to go a bigger motor or 4 stroke. The 91 has plenty of go for the plane, though I had to add about 450grams of lead to get it to balance.

Cheers.

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RE: ThunderTiger Rare Bear - 9/13/2007 12:23 PM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		Hi lil-redrex,
Thanks for your reply. Do you think 13x8 would be overload for OS 91?
How is the speed of your aircraft with 12x8?
Thanks
Asif

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RE: ThunderTiger Rare Bear - 9/13/2007 12:33 PM   
lil-redrex


 

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From: WestAust, AUSTRALIA
Status: offline 		Hi

Not sure, I bought one to try, but havent put it on to compare.

Someone else in this thread was running a 14x7 on a Super Tiger 91.

Mine runs at about 10,000 rpm with the 12x8 (master airscrew) on the packet for the props it says the 13x8 is for 1.08 and up size engines.

I have only had a couple of flights, but the speed with the 12x8 seems pretty good, has plenty of pull and lifts off the runway quite easily on takeoff.

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RE: ThunderTiger Rare Bear - 9/14/2007 5:06 AM   
bignasdy



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Status: offline 		i was usin a 13 8 , three blade ,master airscrew, on st 90, with good results...........good power, good speed, good vertical.................good luck.
d

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RE: ThunderTiger Rare Bear - 9/15/2007 8:58 AM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		Thanks guys,
I will try 12x8 and 13x8, let see which one performas better!!
Regards
Asif


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RE: ThunderTiger Rare Bear - 9/15/2007 11:10 AM   
lil-redrex


 

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From: WestAust, AUSTRALIA
Status: offline 		Just checked my tacho reading again today with both props (both Master Airscrew)

Im getting 11500 with the 12x8 and about 10500 with the 13x8, both static on the ground. The 13x8 seemed to give a lot more pull on the ground, am going to give it a fly with the 13x8 tommorrow if the weather is good.

Im using the TT Rear Bear custom muffler too, this has given me about 500-800 more rpm over the stock muffler on the test stand anyway. Is louder though, but I think it sounds good.

10% Nitro / 20% Coolpower home brew, and only about 16 deg cel today.

Cheers


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RE: ThunderTiger Rare Bear - 9/15/2007 11:43 AM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		lil-redrex,
Thanks for your tach info. Let me know how it flies with 13x8. I myself will be using TT custom muffler for rare bear with OS 91. I believe you will get more speed with 12x8 than 13x8

Asif

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RE: ThunderTiger Rare Bear - 9/19/2007 12:39 PM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		Hello Guys,
I have few concerns; firstly I'd like to know if there is any cooling issue or engine getting too hot? Like I have said before I will be using OS FX and Thunder Tiger custom muffler. Do you need to open vent for cooling? I think the there is not enough gap between spinner and cowl for air flow....so please let me know if somebody having cooling issues or not.
My second concern is about the servos. I am using Hitec 635 HB servos on elevator and rudder (69 oz-in (5.5 kg-cm at 4.8 volt.) Is this torque enough or should I use high torque servos? Please advise...
Thanks
Asif

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RE: ThunderTiger Rare Bear - 9/19/2007 12:41 PM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		OS 91 FX

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RE: ThunderTiger Rare Bear - 9/20/2007 1:09 PM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		has any one had any problems with the fuel tank sitting low in fuselage? I am installing fuel tank and was wondering that fuel tank is low. Do I need to raise the fuel tank?

Asif


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RE: ThunderTiger Rare Bear - 9/21/2007 1:56 AM   
bignasdy



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From: TX
Status: offline 		listen man, just fly the damn thing.........
d

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RE: ThunderTiger Rare Bear - 9/22/2007 9:19 AM   
lil-redrex


 

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From: WestAust, AUSTRALIA
Status: offline 		I raised my tank so its on the carby centre line. Didnt even try it in the stock location. Im using air retracts, so made a shelf for the tank to sit on where the retract servo would normally be. And my air tank sits in the stock fuel tank location below this.

As for cooling, I had some issues, but was becuase I didnt have a big enough cutout at the bottom of the cowl to let the air out. Prob doesnt seem to be with the intake, but the outlet. Though i did open up the front of the cowl about 10mm directly in front of the engine head, and made a baffle up force air over the engine head just to be on the safe side, but probably isnt needed.

Im using 5.5kg servos, no prob.

Main issue with this plane is the landing gear mounts need beefing up, and you want the newer version of the stabliser for the back end (in Aust the supplier sends it out to you for free), and you want to up size the push rod linkages to the elevator. I used the stock balsa "rod" but replaced the wire rods at each end with 4-40 size pushrods and clevis's. Read through this thread, there is heaps of info on how to tackle this.

The plane is a bit of extra work compared to your normal ARF, but the end result is worth it. Great to fly.

Cheers

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RE: ThunderTiger Rare Bear - 9/22/2007 9:49 AM   
Asif


 

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From: Edmonton, AB, CANADA
Status: offline 		Lil-redex,
Thanks for ur reply. Since I have new version of rare bear, I dont see any issues with landing gear mounts, but still I was planning to go ahead with the beefing up. Too late to upsize the stock push rod.... I have already glued it in!!!
Regards
Asif


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RE: ThunderTiger Rare Bear - 9/22/2007 11:43 AM   
lil-redrex


 

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From: WestAust, AUSTRALIA
Status: offline 		Landing gear mounts still need work, even on the newer version, just check through the previous posts.

They will fold out easy otherwise.

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RE: ThunderTiger Rare Bear - 9/26/2007 10:54 AM   
Tony Pacini


 

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From: Prescott Valley, AZ, USA
Status: offline 		After having the kit for 3 years, I finally dug it out last month and got it ready to fly. This thread has been very helpful and I appreciate all that everyone else has posted.

I read of the early stab failures and got an updated set from ACE. I reinforced the landing gear rails as outlined here, too. I used Robart retracts and struts. Even with a YS 1.20 it took 12 ounces of nose weight to balance and tips the scales at an ounce short of 13 pounds. Maybe I should have used my Zenoah G-26 instead!

After building mine I'm convinced that the previous stab failures have been caused by flutter, not by a weak stab. Most failures I've heard about have happened at cruise (with the elevators relatively unloaded) as opposed to while maneuvering. That spells "flutter" to me, and the stab failures are likely just resultant damage.

Knowing that I was going to over-power this model I beefed up the control linkages and did everything I could think of to eliminate any chance of flutter. The stock elevator torque rods are flimsy as is the rudder tiller-arm setup. Both allowed too much flexing of the surfaces. I glassed the elevators with 3.2 ounce cloth (both sides) and went with external horns and 4-40 pushrods in plastic tubes for rudder and elevators. The surfaces are now much more rigid. I also went with 2 elevator servos. The stock setup probably would have been fine if I'd used a 2-stroke engine of recommended size. Thunder Tiger did a great job of keeping everything light in the back, knowing full well that Bearcats have tremendous potential for turning out tail-heavy.

All in all, I'll go on record as saying that Thunder Tiger did a great job with this kit. The parts fit and the finished model is absolutely stunning. It's engineered differently than most, but the stuff seems to work. I changed a lot but only because I elected to over-power the model. The only mod that absolutely HAD to be done was reinforcing the retract rails but this is a common weak spot on ARFs in general.

I'll post my results after the test flights, hopefully this weekend. Wish me luck!







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RE: ThunderTiger Rare Bear - 9/26/2007 12:15 PM   
lil-redrex


 

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From: WestAust, AUSTRALIA
Status: offline 		Good Luck with the maiden!

I agree with you regarding the flutter.

The other Rare Bear at our club has been flying for several years now with the original stab. But the owner had beefed up the linkages to 4-40 size as he put a G23 Super Tiger in it. This was before he knew of any issues regarding elevator failure etc. Was just a natural requirement when installing a bigger engine as far as he is concerned. He was told by the hobby shop to be careful when inserting the stab rods, as they are a tight fit and can damage the ribs if you are heavy fisted.

Though I thought the stock rods where too small, even for the 90 that I run, so I changed them over to 4-40 when I was putting it together.

Cheers

once again....good luck!

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