RE: KMP F-7F Tigercat

RE: KMP F-7F Tigercat
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RE: KMP F-7F Tigercat - 4/6/2008 9:59:34 PM

chasrb

Posts: 953
Joined: 1/12/2003
From: Warrenton, VA, USA
Status: offline

Here's a brain storm or backfire...I am thinking of using another smaller 3/4 inch alum tube and run it thru the center section holes that are for the wires and epoxy it in. I was also thinking I could do a similar action in closer to the leading edge and use an alum 1/4 inch bar stock (rod or sq). I guess I could use the bar stock instead of the tube....

I think this could beef up the center section enough to support my version with the Saito 170's.

Comments?

Update , Just read VK's update and I have found a section iof 1/8 inch by 3/4 inch har stock that will do nicely to add just a bit of reinforcement in the center section. I will use this rather than drilling thru the ribs to add in a smaller bar + it'll be a lit easier.

I am continuing with my build and will have the wing completed this week. I am still figuering out the placement of the components in the fuse...

< Message edited by chasrb -- 4/7/2008 12:24:57 AM >

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Chasman

(in reply to drifter)

Post #: 876

RE: KMP F-7F Tigercat - 4/6/2008 11:39:38 PM

VKerster

Posts: 266
Joined: 12/14/2002
From: highland, MI, USA
Status: offline

T-CAT BROS, I TALKED TO PAUL KONDOR FROM KMP AT THE TOLEDO SHOW FRI., AND DISCUSSED THE CENTER SCETION ISSUE IN GREAT DETAIL WITH HIM. KMP'S POSTITON ON THIS ISSUE IS THE ONLY CENTER SECTION FAILURES ARE FROM TWO CRASHES, MINE(OAK TREE STRIKE), AND THE OTHER WAS THE CART WHEEL (TIP STALL ON TAKEOFF) CRASH. THE CENTER MOST PART OF THE CENTER SECTION ON MY PLANE DID NOT FAIL, ONLY WHERE THE TREE BRANCH WENT THRU. PAUL SAID THE ENGINEERING AND ASSEMBLY METHODS MAKE THE CENTER SECTION PLENTY STRONG AND THERE IS NO NEED TO BUTCHER UP THE WING TO INSTALL REINFORCEMENTS. THEY BUILD UAV'S FOR THE GOV'T USING THE SAME MATERIALS AND ENGINEERING METHODS AS THE T-CAT AND HAVE HAD NO WING FAILURES. AGAIN, THIS WHOLE ISSUE SEEMS TO BE DEBATIBLE. STILL NOT SURE WHAT MY DECISION WILL BE WITH MY BIRD....

_____________________________

VKerster

(in reply to chasrb)

Post #: 877

RE: KMP F-7F Tigercat - 4/7/2008 3:34:08 AM

roncoleman

Posts: 560
Joined: 4/27/2002
From: FPO AE, NY, USA
Status: offline

Check your PM

(in reply to VKerster)

Post #: 878

RE: KMP F-7F Tigercat - 4/7/2008 6:31:18 AM

CHARLES WINTER

Posts: 110
Joined: 1/29/2002
From: MERCED, CA, USA
Status: offline

Hi T-Cat builders. Center Section Discussion: I would rather be wrong about the strengthening of the center section then endanger myself and spectators. I will BOW to the importer. I still wonder why all major aircraft manufacturers still use a main spar construction? If our T-Cats had a honeycomb center section, I could understand the VOID of a connecting center spar. The material on my center section was thin balsa wood with fiberglass cloth and VERY BRITTLE. I will sleep well with a strengthened center section. PS. I'm still waiting to see pictures and names of the people who have PRODUCTION T-Cat (Like the ones we all have) that weigh 22 lbs. ready to fly. This is a GREAT hobby. Keep in touch...

Col. Chuck Winter

(in reply to VKerster)

Post #: 879

RE: KMP F-7F Tigercat - 4/7/2008 10:52:02 PM

CHARLES WINTER

Posts: 110
Joined: 1/29/2002
From: MERCED, CA, USA
Status: offline

T Cat Builders --- Center Section is COMPLETE.. Primer brushed on. Primer wet sanded. Primer airbrushed on. Wet sanded primer (Very Lightly). Airbrushed paint... Yes I will sleep better with a full spar in my wing..

Col. Chuck Winter

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(in reply to CHARLES WINTER)

Post #: 880

RE: KMP F-7F Tigercat - 4/8/2008 7:30:48 AM

Detlef Schmidt

Posts: 62
Joined: 2/22/2007
From: OSTERHOFEN BAVARIA, GERMANY
Status: offline

Hi Chuck,

your job looks good and I agree 100% with you - we will sleep better with the reinforcement of the centre-wing-section.

I also finished my reinforcement during last weekend.

Maybe A.Kondors comment is right that we do not need to do the mod. but in case you will pull too hard one day I am sure we could extend the life of our TIGERCATS with this mod.

My TC weights 30 lbs with 2x g26, SIERRA retracts and all geardoors operated and I have placed the fuel-tank in the centre-section - So I sleep much better with the modification ;-)

Maidenflight is scheduled for 19./20.04.2008 if wheathercondiitons will be ok those days....

best regards

Detlef

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_____________________________

...and always happy landings !

(in reply to CHARLES WINTER)

Post #: 881

RE: KMP F-7F Tigercat - 4/8/2008 5:17:29 PM

CHARLES WINTER

Posts: 110
Joined: 1/29/2002
From: MERCED, CA, USA
Status: offline

Hi Detlef, Thanks for the information and pictures. I am installing Fuji 24 engines in my T-Cat now. My T-Cat with these new engines will weigh 30 lbs. plus. What props have you decided to use? Best LUCK with your T-Cat.

Col. Chuck Winter

(in reply to Detlef Schmidt)

Post #: 882

RE: KMP F-7F Tigercat - 4/8/2008 7:38:10 PM

chasrb

Posts: 953
Joined: 1/12/2003
From: Warrenton, VA, USA
Status: offline

quote:

ORIGINAL: VKerster

CHARLES AND T-CAT BROS, AFTER LOOKING AS CHARLES' PICS, I LOOKED AT MY WING FROM THE CRASH IN UDDER DISBELIEF. NOT ONLY DID MY CENTER SECTION LOOK LIKE CHARLES' PICS, BUT I FOUND THE LEADING EDGE HAS NO SPAR, AND THE TRAILING EDGE HAS ONLY A 1/8" BALSA SPAR!! I'M NOW CONVENCED I WAS RIDING ON BORROWED TIME UNTIL I WOULD HAVE HAD AN IN FLIGHT WING FAILURE. WILL POST PICS SOON.
FOR T-CAT #2, I'M GOING TO TRY TO INSERT A SMALLER DIA. TUBE FROM TUBE TO TUBE LIKE CHARLES, EXECPT I'M GOING TO TRY TO DRILL THRU THE RIBS THAT THE TUBES BUTT UP TO AND INSERT IT ONE INTO THE OTHER SINCE THE WING SECTIONS ARE NOT GLUED TOGETHER YET, AND USE J.B. WELD TO GLUE THEM TOGETHER. ALL OTHER IDEAS ARE APPERICATED. I WONDER IF THE FLY RC MAGAZINE ADDRESSES THIS ISSUE IN THEIR ARTICLE. I WISH KMP WOULD CHIME IN AND ENLIGHTEN ALL OF US HOW THEY WOULD FIX THIS MESS ............. TOLEDO IS NEXT WEEKEND.

VK where are you in this process?

If I understand your post correctly, you seem to be atempting what I have recently thought about, that is to place the smaller tube inside the existing wing tubes, breaking/cutting thru the rib where the tubes butt-up, and then JB Welding the inserted tube in place. Is this correct?

I am to the point where I have finishe all that can be done except for joining the wing together. I'd like to perform the centersectionextomy soon and want to see which rouye may end up the less complex.

Thanks

_____________________________

Chasman

(in reply to VKerster)

Post #: 883

RE: KMP F-7F Tigercat - 4/8/2008 7:46:21 PM

chasrb

Posts: 953
Joined: 1/12/2003
From: Warrenton, VA, USA
Status: offline

quote:

ORIGINAL: VKerster

DETLEF, YOU ARE WELCOME. ANTHONY'S WING LOOKS LIKE MY FIRST T-CAT, THIN BALSA SKIN WITH GLASS CLOTH ON THE INSIDE AND OUT. MY SECOND CAT IS SKINNED WITH A KEVLAR COMPOSITE (LOOKS LIKE PAINTED CARDBOARD) AND SEEMS MUCH STRONGER. T-CAT#1 WAS FROM THE 1ST BATCH AND T-CAT #2 WAS FROM THE SECOND BATCH. I'M CONCERNED WHY ANDREW KONDOR OF KMP IS SO QUIET ON THIS FORUM CONCERNING ANTHONY'S WING FAILURE.................

VK What is the number on your no.2 plane? I have 79, not sure what batch that is in.

Thanks

_____________________________

Chasman

(in reply to VKerster)

Post #: 884

RE: KMP F-7F Tigercat - 4/8/2008 8:55:39 PM

Detlef Schmidt

Posts: 62
Joined: 2/22/2007
From: OSTERHOFEN BAVARIA, GERMANY
Status: offline

Hi Chuck,

thanks for your greetings.

I am using 16x8 3-blade MENZ props the G26 are turing those props with 7.100 rpm

An alternate for me would be a slim 16x10 3-blade carbon-prop from ENGEL supersilence.

Those 16x10 will be delivered during this week and Andreas Engel, the manufacturer told me, that I propably could gain a few revs and my TC could be a bit faster with those 16x10.

I will test them and let you know...

_____________________________

...and always happy landings !

(in reply to CHARLES WINTER)

Post #: 885

RE: KMP F-7F Tigercat - 4/8/2008 11:18:13 PM

Pylon2

Posts: 63
Joined: 10/20/2007
From: sleaford, UNITED KINGDOM
Status: offline

Hi Detlef,
Could you send me a picture of your front noseleg door inside. I would like to see how you have done this. I have fitted Century jet retracts in mine. Should test fly mine also in the next 2 weeks.
Cheers Richard.

< Message edited by Pylon2 -- 4/9/2008 11:26:40 PM >

(in reply to Detlef Schmidt)

Post #: 886

RE: KMP F-7F Tigercat - 4/9/2008 12:03:23 AM

chasrb

Posts: 953
Joined: 1/12/2003
From: Warrenton, VA, USA
Status: offline

quote:

ORIGINAL: CHARLES WINTER

Hi Detlef, Thanks for the information and pictures. I am installing Fuji 24 engines in my T-Cat now. My T-Cat with these new engines will weigh 30 lbs. plus. What props have you decided to use? Best LUCK with your T-Cat.

Col. Chuck Winter

Charles, I am proceeding with sliding a tube in thru the wing tubes and will JBweld in place once it is in place. My question to you is will that be sufficient or does the wood cross brace need to really be in there too?
Thanks

_____________________________

Chasman

(in reply to CHARLES WINTER)

Post #: 887

RE: KMP F-7F Tigercat - 4/9/2008 7:39:55 AM

CHARLES WINTER