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RE: ThunderTiger Rare Bear - 2/25/2005 5:07 PM   
khh1955


 

Posts: 62
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Joined: 1/17/2004
Last Login: 5/12/2012
From: Santa Rosa, CA, USA
Status: offline 		Our club has a monthly meeting & we do a raffle...usually an ARF,engines & misc.stuff.

It was my lucky day,as I won the ARF,which happened to be the Rare Bear!

Being blond,I went ahead & bought stuff for it & put it together,I did talk to 2 of the local
hobby shop guys first to get some inside info on it. I can see now that I should have started looking
thru RCU before I got started.

Anyway,here is how I set it up,any helpful comments would be appreciated!
Used a Super Tigre g90 w/bisson muffler,GP 60 size mechanical retracts,HiTec high torgue digital servos for the elev/rud/ail & a standard servo on the throttle. I did epoxy in 2 -12" strips of 2" glasscloth into the fin for extra support,and epoxied all around the retract bay...which hopefully will give it enough strenght.

Kurt

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RE: ThunderTiger Rare Bear - 2/25/2005 6:49 PM   
JWORTNER



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From: Tampa, FL, USA
Status: offline 		Kurt,

There has been many horz stab failures on the RB. If you read the last 6 or so pages in this thread you will see many posts from me and others on the stab problems.

A little further back I posted the mods I did for the retracts, which I know work because I have had several hard landings and they have held.

I would venture to say that if you fly this bird without opening up the stab there is a good chance it will fail, maybe not as high a chance with a 90 size engine. Read back a few pages and look at the pics and decide for yourself.

I would also venture that just epoxying the existing retract mounts may not be enough, but that is not the end of the world.

I would also suggest adding the wing bolts I describe and show with pics a few pages back.

Lastly, I would suspect that you will have to add a good deal of nose wieght to balance with a 90 up front.

Keep us posted on your flights please. Good luck

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RE: ThunderTiger Rare Bear - 2/26/2005 3:08 AM   
khh1955


 

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Joined: 1/17/2004
Last Login: 5/12/2012
From: Santa Rosa, CA, USA
Status: offline 		Thanks for the info JW...

I just finished putting together & getting in a few flights on the new TWINSTAR ARF that Hobbico came out with.
Twins sound so cool...I love it!

Now that I over the thrill of doing a twin,I think I'll get back to focusing on the RB.
I've had the RB ready to fly for a few weeks now,too bad that its just a bit too big for
my truck,too much of a hassel to disassemble it to fit,so I'll have to borrow a work truck to transport it...sucks!

Anyway,I'll have to do some research thru this site to see what chgs I need to make!

Kurt

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RE: ThunderTiger Rare Bear - 2/26/2005 7:27 AM   
khh1955


 

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From: Santa Rosa, CA, USA
Status: offline 		Hey Frag...
How do you think the gorilla glue would work as a reinforcment around the retract cavities?

I have never worked with GG before,so I think I'll go get some tommorrow...I like your suggestion
for its use on the stab problem. Sounds like its a good method of adding strenght to a hard to get to
area.

Kurt

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RE: ThunderTiger Rare Bear - 2/27/2005 7:44 AM   
Frag



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From: Fayetteville, GA, USA
Status: offline 		I think you need to put wood blocking to support the retract mounts. The gorilla glue by itself probably wouldn't give the wood mount the strength it needs to resist rolling out of the wing on landing (or even taxiing!). And for the record, I did get some GG, but its RC FLYING HEAD that has actually used it in the stabs. I am still contemplating injecting the GG into the one stab I didn't cut open to glue. I'll probably end up trying it this way.
You could use the GG along with wood blocking for the retract mounts, I'm just not sure if its any better or worse than using epoxy.

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RE: ThunderTiger Rare Bear - 2/27/2005 10:30 PM   
Skip 52



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From: Whitesboro, TX, USA
Status: offline 		Has anybody had a issue with the tail wheel bracing? It seems like you are putting alot of stress on the fiberglass fuse with the 4 screws and using epoxy on the bracket sides and where it fits into the former? (no support for the rear of the bracket except for the fuselage. Thanks, Skip.

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RE: ThunderTiger Rare Bear - 2/28/2005 2:57 AM   
RC Flying Head



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From: pleasant view, TN, USA
Status: offline 		Skip, I added plywood and mounted a sullivan tail wheel using bolts and blind nuts.

Also, JWortner, Vampire, I'm completely finished with my Bear. It looks AWESOME! OS-160, Sierra Air Retracts, Smoke system.
JWortner, your plane flew nice in the video. What control throws did you use for the elevator and ailerons? And, what point did you measure the CG...the reccomended 5.25" from wing front? Did your plane want to naturally climb?
I haven't broken the engine in yet, but will be ready to take her out in a couple weeks.
Thanks....
Dudley

Getting ready to build a Hangar 9 Corsair....

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RE: ThunderTiger Rare Bear - 2/28/2005 4:54 PM   
JWORTNER



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From: Tampa, FL, USA
Status: offline 		Dudley,

Yes, the initial video has the CG right about at the line in the fuselodge where the manual recommends. Yes, if I trimmed for level fight at 1/2 throttle, it would climb significantly on full throttle. I decided to trim for full throttle since that is how I run her a lot. Had a slight tendency to decend 1/2 but not enough to bother me. I did end up mixing in a little up elevator when my gear goes down for landing.

After the 3rd flight when the stab began to fail I did all my tail mods, including moving the servo to the back. This moved my CG back about 1/2 inch. The plane still landed good. Spin recovery was still right on. It is really on the edge though I can tell you that.

So, what did you do about your second stab? Did you open it or use the gorilla glue?





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RE: ThunderTiger Rare Bear - 3/1/2005 4:39 AM   
prostockbob


 

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From: Stockton, CA,
Status: offline 		Hi everyone I was wondering if there is anyone here interested in building my rare bear for me?I really love planes but because of my job and kids I dont have the time to build this plane. I need someone to help. If anyone is interested let me know Thanks Bob748@aol.com

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RE: ThunderTiger Rare Bear - 3/1/2005 5:04 AM   
Frag



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From: Fayetteville, GA, USA
Status: offline 		Send the ARF with engine and retracts. Also include a two thousand dollar money order. It will take at least 90 days. This includes beefing up the stab and retract mounts and custom wing bolt plates.

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RE: ThunderTiger Rare Bear - 3/1/2005 6:19 AM   
RC Flying Head



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From: pleasant view, TN, USA
Status: offline 		Frag, Wow only $2000! I should have hired you to build mine! Would have saved me five months! )

ProStockBob, you should check with your local Hobby shop. Sometimes they know of a local retired RC veteren that does some building on the side for a few hundred dollars. I would request that read this thread completely (print it) prior to quoting or building. Our local shop has about 3 gentlemen, but we're in Nashville, TN.
Dudley

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RE: ThunderTiger Rare Bear - 3/1/2005 7:14 PM   
Frag



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From: Fayetteville, GA, USA
Status: offline 		I'm glad no one took that seriously

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RE: ThunderTiger Rare Bear - 3/1/2005 9:56 PM   
RC Flying Head



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From: pleasant view, TN, USA
Status: offline 		Here's a few Pics of the beaut!

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< Message edited by RC Flying Head -- 3/1/2005 11:35 PM >

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RE: ThunderTiger Rare Bear - 3/2/2005 6:33 AM   
sj crash


 

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From: San Jose, CA, USA
Status: offline 		Jeff
In my case Ace still insists there is nothing wrong with the design and even suggested that they recommended beefing up the stab. If telling you to make sure that glue for the rods gets on all the ribs well..... They may do something about the quality of the kits later on but certainly don't stand behind their product guarantee re: defects. Another thing I have noticed on ARF's using laser cut parts. The burnt wood is not removed before gluing. This will weaken a joint.
Dan

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RE: ThunderTiger Rare Bear - 3/2/2005 11:49 PM   
Frag



Posts: 285
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From: Fayetteville, GA, USA
Status: offline 		RC Flying Head

So sweet man - how did you attach your wheel bay covers to the struts? And I noticed you painted your cockpit black - I like that touch.



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RE: ThunderTiger Rare Bear - 3/3/2005 9:26 AM   
speedaholic



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From: fresno, CA, USA
Status: offline 		Lots of good info here on this plane, I am in the process of building one also, I am going to do the gorilla glue in the stab, also made the canopy easy to remove using bvm hatch setup, here is some pictures of the progress, going to put the switch and air under canopy, keep it clean. looking forward to flying fast and low.

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RE: ThunderTiger Rare Bear - 3/6/2005 3:49 AM   
Rbeav533


 

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From: Spring, TX, USA
Status: offline 		Dan,

I've noticed a number of issues inside my right stab that might be the primary cuase of the failures. I've only modified one stab to date, and when I open the second stab I'll take pics and post them.

Rich

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RE: ThunderTiger Rare Bear - 3/6/2005 7:58 AM   
speedaholic



Posts: 291
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From: fresno, CA, USA
Status: offline 		I have found a problem with the tail linkage that may cause flutter, the rods that go to the inside for the elevator pushrod flex or move away from the elevator onder load so i mad a bearing for the rod where it enters the fuslage to keep it solid and strait, to do this i put oil on the rod and then used some aeropoxy mixed it up and put it around the rod and spead on the fiberglass, when it dried hard i then broke loose the rod, now have a perfect bearing around the rod and have eliminated the problem, i hope this helps, or you understand what i am saying. here are some pics.

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RE: ThunderTiger Rare Bear - 3/6/2005 3:13 PM   
DepDog60


 

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From: Buskirk, NY, USA
Status: offline 		Flying Head
She looks beautiful on the table! A very nice job as all the planes I've seen pictures of in here.
I'm curious as to how the GG in the stab thing works as well as what did it do for your CG balance. This is already a tail heavy plane.

Thanks

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RE: ThunderTiger Rare Bear - 3/27/2005 8:35 AM   
speedaholic



Posts: 291
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From: fresno, CA, USA
Status: offline 		welp, had the maiden flight today, os 160 ran great, still in the breakin phase, hav robart gear and struts, the plane tookoff well, rates were a little fast at the sugested setting so i reduced and added a little expo to the mix, took it easy but went very well, is pretty fast with the 16x8 3 blade prop, i put the servo in the tail for the elevator and gap sealed the elevator and the rudder, landing was awsome, it actually lands pretty slow, and is very smooth on landings, it came in nicely with no problems, even with a almost full tank, engine loaded up and quit, came in for a nice smooth landing, looking forward to fling it again, i will post pics as soon as my bud emails them to me.

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RE: ThunderTiger Rare Bear - 3/27/2005 8:36 PM   
hattend



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From: King Salmon, AK, USA
Status: offline 		Speedaholic,

Turn the auto-focus off on your camera, if you can. I have no idea what you are showing in the closeups.

Just a suggestion...I'd really like to see what you did.

Don

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RE: ThunderTiger Rare Bear - 3/28/2005 6:25 PM   
lyechuan


 

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Last Login: 3/31/2009
From: George town, MALAYSIA
Status: offline 		Hi There,

I'am Lyechuan from Penang ( Malaysia), Recently got one from a freind who seems to give up
hope of his RearBear after 3 unsuccesful flight attemp which always ended with crashed,
so I've took back and did some repair and research, found out several mistake he has made,
first of all the elevator was not link up properly, than he's using a .60 engine with original pipe
for this plane, nice but very much under power, the worst part was the CG , when the wing is
attached with everything in, the tail was too heavy , this is normally the case when the entire fuselarge was made of fiber glass, believe it or not I have to put in 1kg of weight to get the CG correct. Anyway the plane fly just nice still with the .60 engine and 11x8 prop after repair and weighing over 5Kg, but could not do either loop or roll.
So I took out the engine and the counter weight, put in a US engine 25cc, crazy you may think,
but the weight of this gasoline engine is equal to the weight of the previous .60 engine including
the muffler and 1kg of counter weight, so far I've flown the plane well over a dozen time, able to carry out very nice loops and roll, landing is quite easy with fair head wind, need to polish
my landing skill with using flaps.

( In order to install the US engine to this plane, the original firewall has to be remove and replace with new firewall without servo & battery compartment up front.)

Best Regards.


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RE: ThunderTiger Rare Bear - 3/28/2005 6:43 PM   
Desert Toad



Posts: 274
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Last Login: 10/22/2011
From: Lovelock, NV, USA
Status: offline 		Howdy again, gang!

So after three flights, and three gear rip-outs, I'm in need of a bit of help. Since my internet is slower than molasses in the middle of winter, could someone either send picts of an open and repaired wing, or point me to the correct page in this thread, also need the same for the brand of covering used here. I had previously fixed the wing without removing the sheeting, but I now have epoxy smeared everywhere and need to open it up and rebuild completely.

This leads me to my next thought, Have the Thunder Tiger people quit reading this thread? Have they offered anything for us people with bad wings? Did they have any idea that glueing landing gear blocks to nothing but the 1/16" balsa wing ribs was a bad idea?! The only failure I've ever had with a plane that was a manufacture's fault, was a Global ARF, I sent in the bad section (tail) and they immediately sent me an entire aircraft. At this point it seems it would be best for TT to send out new wings at least....


Okay, my rant is over for this week...

DT

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RE: ThunderTiger Rare Bear - 3/28/2005 9:35 PM   
americ


 

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From: Gloucester, MA, USA
Status: offline 		Yo DT,
Got nuthin' better to do so thought I'd research your gear/sheeting problem. Try these pages:

Page 15, posts 439 & 448
Page 23, posts 671,676 & 684
Page 25, posts 740,749 & 750

Good luck and keep us posted! Btw... gear doors ready yet?


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RE: ThunderTiger Rare Bear - 3/28/2005 11:08 PM   
Desert Toad



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From: Lovelock, NV, USA
Status: offline 		Thanks, Americ.

No gear doors yet. The thief that took them didn't make it out for Easter. Guess he was trying to sell a Mig, and had some test pilots flying them on Saturday - took longer than he thought.

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