My Kyosho P-40 is no more!
As I was coming off the base leg in a turn, all of the sudden the horizontal stab exploded and everything around it let loose,it went inverted and spiraled into the ground!
I had an OS 70 4 stroke with a 3 blade prop which was the perfect combo,I guess it is a munufacture defect because im told this isn't the only Kyosho P-40 to do this exact thing!
Im thinking of getting the H9 P-40 now,I hope the tail feathers are better than this one.
Anyone know of a good P-40 that I can put this 70 4 stroke in...it would save me the money of having to get the H9 and have to buy a new engine to boot?(Arf)

Sorry to hear P40Luver .[&o]

are you sure you can't rebuild this one. I think it might be worth a try.

sorry to hear about the loss. Have you checked into the VQ P40? I have one on the bench now and its a beut!

matt

Someone's H9 P-40 just had a stab failure in flight last week. Look in the Warbird forum, you will find it, as he posts this incident in 3 threads there.

OS 70 may be a little small for the H9 P-40 as well as the VQ P-40. Perhaps the World Models P-40 is more along the size you need. It has the British marking.

Looks like the elevator pulled out of the horizontal stabulizer. Was this due to flutter?
That is the only thing that I could think of that would make the tail "EXPLODE"

The only World P-40 that would accept a 70-4s would be the small pylon racer/combat model. The other one is much too large.

No it wasn't flutter...I suspect that the horizontal stab was built weak.in a tight turn it had plenty of G's on that stab and it broke right at the fuse..the whole half came off.. the other damage was cause by the parts thrashing around until it met terra ferma![X(]
You can see one half still attached,the other half of the stab was lost in the high grass.
I seen the H9 P-40 in the LHS today, it really looked nice,im concerned now with the post of, THAT stab breaking![]
I have got to have another P-40 and it would be nice to use the engine from this one but it looks like nobody has a P-40 that looks good in that size.[&o]
The Magnum 91 is back up to 199.00 now too,I hate to have to get another engine but looks like a new engine and H9 plane is in order!

Sorry to hear of your loss....I'd say rebuild it....but if it was mine, I'd scrap it

Jerry

i should just count my lucky stars because i have never crashed

better not get a kyosho p-40

This is the one I am talking about:



http://theworldmodels.com/para/produ...?airplaneid=27

I have had a stabilizer came loose on me once on a Kyosho Flip. I was lucky to see it right after the breakage and landed it safely.

There are several forces working against the stabilizer structure:

1) servos push onto the elevator(s)
2) air's force onto the elevator(s)
3) hinges' resistance against servo push
4) flutter caused by air and stabilizer vibration resonance

(1) To avoid servo push's on elevators to act against the stab, make sure elevator travel does not exceed what's physically permitted. Also, ensure there is hinge gap and the adjoining edges are adequately beveled.

(2) Air's force onto elevator is not something we can avoid. But we can make a judgement call: if elevators are huge, stabilizer should have tail brace; or the stabilizer should at least be sheeted, or basswood/CF rod strengthed

(3) Hinges' resistance vary depending on what kind of hinge. CA hinge will pose a lot of resistance under large deflection. I use Robart point hinges where deflection will exceed 30 deg.

(4) Flutter usually is not the cause for stab failure. A tail control system w/ VERY sloppy servo or flimsy elevator/stab can introduce flutter. However, most applications are not likely to be the case. Flutter is more likely to take place on aileron, where the surface is long and flimsy (relatively). However, when a stab fails in air, it will start to flutter. Most of the stab failures have been attributed to flutter, but I disagree. I believe flutter is the result of stab failure caused by the previous reasons.

************************************

So, my conclusion is, when the plane has built-up stab w/o sheeting or tail brace, combine it with CA hinges w/ insufficient hinge gap and adjoining edges that are not double-beveled, stabilizer is an accident to happen.

Recommendations:

* Use point hinges
* Leave 1/16" hinge gap, although unslightly, will allow elevators to move without straining the stab.
* Use low-slop servos if deflections will be huge. Hitec 5475 & 475 are my favorite for low torque application like this.

crashed 2 hanger 9 p4o's due to rear stabilizer coming off mid flight.both stabs failed due to bad wood or crafts man ship. never by another hanger9 product again.[:'(]

it sucks when something like that happens. some guy at the field last saturday had a rough landing and pulled out his front gear on his brand new pattern plane. he spent a good 2-3 hours repairing it at the field.

on his first flight up after the repairs he is coming down from a hammer head and as he pulls to level the plane from the downline, his left horizontal stab flutters away... he slammed full speed into the ground. engine and 2 servos are severly damaged and may be left for scrap. while i didn't offer my opinion as to why it may have happened. i noticed that the break was exactly where the stab meets the fuse and suspected that it may be because he was a little heavy handed when cutting the covering to glue the stab. this is a serious issue and i recommend that everyone uses the soldering iron method in removing the film, it's much better than scoring the stab and waiting for disaster...

not saying that is what happened to you because i can't really see, but it is what i think happened at my local field a few times.

Tailskid..Yep I will scrap it...can't get parts...Wes..this plane is not made anymore...I wonder why?
About every part of the plane has damage to it..im not one for repair, by the time I invest in parts,covering, hours of my time it's not worth it.
<------I will have another WARHAWK in the air soon my favorite bird by far----------------------------------------------------

Hey Forestroke, how do you use a soldering iron to remove the covering? I'm at that point on a Sportsman Waco. Thanks.

timoteo - just take an old soldering iron (you can use a new one but it will soon be old :-) and score it down where you would normally cut it. don't move too quickly but slow enough to seal the covering on the wood. you can test on some scrap first so that you know about how fast you have to move. after that you can remove it by cutting a flap with a blade (careful not to cut he wood) and then from that pull the rest of the covering off. if it rips off incompletely, you can just use the edge of a blade to pull off another flap.

i use the soldering iron for things like burning aileron lead holes in dual aileron wings and other places where the burn mark isn't so evident.

since doing this i never use my razor unless i have to. i always have a fear of cutting too deep and compromising the structure.

P-40LUVR - if you are looking for another, i would recommend looking at the CMP version. unfortunately you have to go through the infamous GSP to get it but i think it will be a much better kit than either the Kyosho or the WM. while the WM is a great plane it isn't as scale as this one. while i haven't seen the CMP version of the warhawk, i have seen their zero's, p-51 (small and large) and owned their cessna and yak. i can say that the warbirds are excellent and have great detail. take a look!

The CMP version will be out in late May you may be able to get it from Raidentech in ElMonte Cal , they also distribute GSP and they are much better then GSP .
I have the VQ P40 , I think its the best P40 out there in its size .
Flaps, real tail airfoils, aluminum supports in the internal tail, free oleo struts , pilot, panel lines , rivits ect .
the absolute only negative is the somwhat off scheme in color .
Do a search Richare L did an online build and fly .
I think your engine is a little small but sell it and start over , the plane is worth it

Hey,

I agreed with LDM. Buy the VQ version, then strip ALL covering and reinforce any questionable joints then recover in Ultracote. It has much better outline than the H9. I have not seen the new CMPro P-40 but I hope that the body will have thicker fiberglass than their past offerings. A major problem with thin FB body is that it tends to flex and CRACK the gel coat or your paint if you have a rough landing. I personally would check out the CMP one because FG body gives you details that cannot be found in traditional balsa planes such as air scoups, rivets, panel lines and airfoil stabs. Dai

no retracts are in the VQ P.40.
Of course you could say the h9 retratcs are crap, but they still exist...
Personally, I don't plan to put a 250$ retract set in a 250$ airplane...

The VQ P-40 is very good and sturdy. Its rear stab will never fail in flight due to its robust design. You don't even need to recover the plane if you don't want to. If you don't care for the stock color scheme, then you can lightly sand the entire plane and spray on your favorite color scheme. By the way, the factory black "STUD" color scheme is fairly accurate.

The VQ plane comes with Oleo , for another $100 you can add the Robarts and your all set , you dont have to go to the Cj gear , I did but you dont have to ,
I will say this , you should see the inside of this VQ P40 , I could not build one this good on my own , the internal braceing , the accurate ribbing in the tail , its straight , strong and true

sorry p40 luvr i had the same thing happen to me with my kyosho p40,just heard a pop and both rear stabs snapped of the only thing holding it in place was the covering i managed to land mine with very little elevator ,but lost the plane do to firewall failure on the 5 th flight even after i reinforced it.but it still broke apart below the reinforcment i just walked up to it and kicked it[:@].now i have the H9 p40 and it flyies great

Hey I was reading your post and noticed that you are considering a Hanger 9 P-40 , I just crashed one with the same thing you had javascript:void(AddText('[\&o]'))
javascript:void(AddText('[\&o]'))happen, I was running a YS110 and it riped apart, it might be that fact that the engine is too much for the plane, anyway just thought I might share that with you. I did purchase a GSP P-40 for my next build " good luck"