RE: ThunderTiger Rare Bear
 

looking to put a 120 twin in mine. anyone else done one similar?

RE: ThunderTiger Rare Bear
 

DT and anyone else...:)..simple this one ;)...drill your holes where the screws are gona be in the fuze...thread a couple of foot of pull/pull wire through the hole, slip a pre drilled little square ply plate onto the wire tie a knot in yor wire behind the plate then pull the plate up snug with the inside face of the fuze next to the firewall.....dribble a bit of CA onto the little ply plate ...jobe done :)...The hole in the ply plate may not have to be dead centre and the Du-Bro plastic covered pull/pull wire works best ....the CA wont stick to it...:)

RE: ThunderTiger Rare Bear
 

Skycom..cool..:)which one..?

RE: ThunderTiger Rare Bear
 

mvvs 120:D http://www.justengines.unseen.org/frmvtwin.htm

RE: ThunderTiger Rare Bear
 

....43 or more ounces though...[:-]...got to keep the weight down ....turns out the wing area is only 750 odd sq ins...we were going on 770.

RE: ThunderTiger Rare Bear
 

Why not include the lifting area of the fuz? must be considerable on this a/c.

RE: ThunderTiger Rare Bear
 

...got a feeling that is including the area of the fuse..

RE: ThunderTiger Rare Bear
 

I don't see weight being much of an issue until you get over 15 lbs, then things start to get fun. We know Vampire's RB weighs 11.5 pounds which translates to a wing loading 35.3 oz/sq.ft, when using 750 sq. in. as the wing area, and he's reporting delightful handing and a great glide at this weight. In my personal experience flying all sorts of old school scale Fighters, Royal, Top Flight, Yellow Aircraft, ducted fans, etc, things don't start getting really interesting until the wing loading gets to about 45 oz/sq.ft of wing loading.

I once built/flew a fully scaled out Yellow Aircraft A-4 with the scale 40" wing. This plane weighed just over 14.5 lbs and IIRC, this translates to a wing loading over 50 oz/sq.ft. This plane would lift off the runway and then really didn't want to fly until the gear came up and the wing was clean (rotating retracts with HUGE main gear doors). It was very nice to fly once it was cleaned up and on the step. Landing was done like the real deal, enter crosswind, throttle back to about 50% and slow down. Turn downwind, drop the gear and confirm all three down, 1/2 flaps at mid point of runway, adjust power. Abeam the touch down point is where a tactical pitchout to landing started by reducing power, adding full flaps then the pitch out. Once lined up on final I would hold a constant nose up pitch, ie; constant angle of attack, and control the rate of descent with power. Touch down occurred somewhere between 45-50 MPH. Very positive touchdowns, basically a controlled crash.

IMO, the RB will probably do well up to about 13 lbs which is equivilent to about 40 oz/sq.ft. wing loading. Anything above this and I believe the plane will still fly well but won't like being mishandled.

Just my $.02.

Rich

RE: ThunderTiger Rare Bear
 

Sorry..I dont even want to think what 40 oz sq ft would be like.

..."Very positive touchdowns, basically a controlled crash." ...and i dont want to go here.

RE: ThunderTiger Rare Bear
 

Sounds like "aps f4u" found the stall speed at 20 ft of altitude, not at 100 ft like he should have during the test flight. I see the RB for what it is, a nice stand-off scale model designed to be a relatively easy to fly model. Imagine what it would be like to fly a true to scale version with clipped wings and a scale tail, probably wouldn't be flyable by the average R/C sport pilot this model is aimed for.

I have two scale models that fall in this catagory. A Royal Kawanishi George and an overweight (14.5 lb) Top Flite P-40. Both fly well if you know what you're doing, very scale like. Pull too hard during any manuever and they both will snap roll so fast it's scary. When the gear is retracted on the P-40 it gets touchy as the CG shifts back.

Lke the real world counterparts they emulate, scale warbirds can bite you big time.

Rich

RE: ThunderTiger Rare Bear
 

FINALLY!

11.25lbs with no lead. YS 110 ready to go.


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RE: ThunderTiger Rare Bear
 

good luck hope it holds together.i dought it.

RE: ThunderTiger Rare Bear
 

Looking good DT [8D]

Looks as though the YS 110 is the engine to use. Everyone that I've heard of using it has not had to use any nose weight, and not having to put dead weight in an airplane is good thing in my opinion.

RE: ThunderTiger Rare Bear
 

Well I've been MIA in this thread for a while.... haven't had much to say since my retract mount on one side ripped out on perfectly greased in landing on brand new asphalt... even with some serious tristock and epoxy reinforcement...that was back in the begining of october.......so long story short, Ace set things right.... I've just got to figure out what to do so this won't happen again. i didn't like that one bit seeing my pristine RB grinding to a hault on the pavement. Word of advice if calling Ace for help... I talked to a couple people, and by far, Anthony is the man you want to talk to!

Good luck DT, and I'm currious how you got yours with no nose weight since we pretty much have the same setup. Snap a couple pictures of under the cockpit!

RE: ThunderTiger Rare Bear
 

HighSierra, how did Ace "set things right"

RE: ThunderTiger Rare Bear
 

Hi lee hear
I have been looking at all of what you have to say about the RB, as i have one to. I will be fitting mechanical retainers in my one and what do you think are the best to go for, by the way i will be puting in a OS 91FX in as i have got ont sitting in its box. Good lack with the test fligth. H S when you have figured out how you are going to reinforc the land mount please let me no.

Lee

RE: ThunderTiger Rare Bear
 

Frag, they set me up with a wing, spinner and stickers. It was pretty clear where the factory glue joints had next to no glue on them as the ply gear mounts pulled away from the wing ribs cleanly. The damaged one could be fixed....but it would take some time to make new wing ribs and some hacking to get under the balso sheeting to good wood.....so for the first time in all my years of rc, i went for the holly grail and stated my case to ace to get some free replacements.... after a little over a month and a half I finally talked to the right person and got hooked up. Thanks Ace!

As for reinforcing... i'm really not certain....but I can tell you, tri-stock and an epxy coating is not enough to make me comfortable anymore... There needs to be some braces i think.

Also, I think i remember reading it in one of the previous threads..... But befare, that the supplied control rods (ie ailerons and elevator are not exactly 2/56 (so if you use their rod and say a Sulivan clevis, it'll strip loose) ....I'd highly reccomned throwing them out and getting 4/40.

My Bear flew good when it did, but now that winters here, I fly alot less, So before i fly it again i'll probably rearange things inside to get more weight forward, and get the LG mounts to be bomb proof (that might be asking too much)!

RE: ThunderTiger Rare Bear
 

I aquired my RB with a 40% discount due to "transit damage".The price in Dubai is 900dhs. The box looked pretty bad but the damage was confined to the port wing skin + 2 ribs. I was supprised to find the sheeting came away easy (too easy!) Not much glue applied in there boys. I was going to fit my MVVS 160, but decided to go with OS 120 FS and build it "stock",no mods. This plane is a nice rendition of the real thing but is definatly no unlimited racer!!

RE: ThunderTiger Rare Bear
 

imo, after reading through this thread on a continual basis, it's probably just wise to cut into the lower section of the wings and horizontal stabilizer right at the start of construction and fix all of the glue joints - landing gear reinforcement using light ply all the way to the spar/tube on both ribs that connect to the landing gear block. all of the torque the landing gear moment arms impose upon the framework needs to be directed into something solid, not weak glue joints.

with extra effort, one can have a killer unlimited racer and not have to worry about gear ripping out and/or stabilizer failure. i'd like to see Ace hobby at least add an addendum to the instruction manual warning of potential gear failure as it does seem to be a commonplace occurance with respect to the builds on this thread and if that is an indication of a good statistical sampling of all other builders who do not post, then it should be addressed and fed back to thunder tiger for some design changes. it's only natural that since the rare bear is a speed demon, that modelers are going to want to over power this airplane to make it fly fast - and it should have been designed that way in the first place - like i said, just my opinion.

desert toad, give us a flight report after your maiden. i'm curious how the CG works out with the YS110 and what kind of speeds you get. i've been holding off buying this kit and i'm glad i waited to see what kind of problems have surfaced. when i do buy it, it'll be YS powered. thought a YS140 would be a good match but if toad get's good speed with a 110 and there are no balance issures, then that's a good approach.

it's a beautiful plane and it's a shame to see all these landing gear failures scar up the undercarrige on maiden flights as it slides across the runway.

RE: ThunderTiger Rare Bear
 

I think that's the only way to deal with the torque on the landing gear (ply supports running back to the wing tube and a new cross support up by the LE. I think I got off lucky when mine collapsed.....all the damage was to the one wing with the failure and a slight scuff on the other wing tip, and a bent spinner backplate from the ensuing prop strike. But no scuffs on the fuse, tail or cowl. I just have to work up the currage to cutting my wings up now......I guess I know the alternative though.... fortunatly I'm pretty sure the horizontal stab is safe as if it where to have sepperated, it would have done so allready (allthough i'm still thinking of injecting some gorilla glue for peace of mind).

RE: ThunderTiger Rare Bear
 

Are you guys trying to scare me from flying this beast? It's built, so flying is all there is left to do!

Here's a couple shots of the inside, not sure if this will help or not, HighSierra.

RE: ThunderTiger Rare Bear
 

Thanks DT.... I went and moved my valve setup up front similar to your to try and get some lead out of the nose... Just make sure you really beef up those retract mounts!!!! Fortunatly flying this thing is a piece of cake!!!

I was stripping all the stuff all the stuff off the bad wing and cut it open to see how things are framed up.... I didn't realize that was indeed the wing spar against the back wall of the retract bay.... Shouldn't be too difficult to put some more bracing in there so the mounts won't rotate out.

RE: ThunderTiger Rare Bear
 

What a shame on these ships, they need to do a recall before they lose all credibility!

RE: ThunderTiger Rare Bear
 

I had a rare bear it;s history. I have a dago red from world models. it;s twice the aircraft.Last week we clocked it at 139 miles and hour by radar gun. i don;t how close the radar gun was but it sure looked like it was going that fast.powered by a webra 120 take care have a nice day

RE: ThunderTiger Rare Bear
 

..MANFRED...what engine do you have in yours, what gear, and what was its all up weight.?