Notices
Twin & Multi Engine RC Aircraft Discuss the ins & outs of building & flying multi engine rc aircraft here.

KMP F-7F Tigercat

Old 06-26-2008, 08:42 AM
  #1001  
Senior Member
 
Join Date: Jan 2008
Location: melbournevictora, AUSTRALIA
Posts: 356
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

this has been a great read guys I may get one of these birds yet.....or the 3W version if I win lotto!
Old 06-29-2008, 05:30 AM
  #1002  
Junior Member
 
Join Date: Feb 2008
Location: Sandhurst, UNITED KINGDOM
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Brand New unstarted YT/KMP Tigercat for sale at £350

Hi guys, due to too many unfinished projects and committments, I've reluctantly decided to sell my Cat, its probably the only new one for sale anywhere, as YT are completely out of stock, so if you want to get your hands on one of these super birds, this is your chance.

Good luck to all you Tigercat guys, and safe landings

Ravindave
UK
Old 07-02-2008, 12:33 AM
  #1003  
Senior Member
 
Canuck1's Avatar
 
Join Date: Jul 2002
Location: Edmonton, AB,
Posts: 1,845
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Beauty aircraft.

Idigbo.............how did you achieve the finish like that? Looks awsome.

Craig
Old 07-03-2008, 07:42 AM
  #1004  
Senior Member
 
duber3's Avatar
 
Join Date: Oct 2005
Location: QC, QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Is this thread dead??
anyway, I will receive my new retract Gen 5 from KMP soon ( I hope ), the plane is almost ready
I started my G20ei yesterday, they seem to be very powerfull, I puted an APC 16x6 and the rmp was 8700

in about 1 month, I will fly it
Old 07-03-2008, 08:23 AM
  #1005  
 
chasrb's Avatar
 
Join Date: Jan 2003
Location: Warrenton, VA
Posts: 1,256
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Nope not dead just sleeping...lol

I have completed my TC and took it into the yard yseterday to do the inital run of the engines. I need to do a few mods where the needle adj is - it's a little tight to get to. But it did run with the 170's they sound nice. One thing I did notice is that the Sierra retracts are half compressed! Wow, I'll have to adj those somehow to support this beast. I have yet to weigh teh TC but I am sure it's 28-30 LBS at least.


Happy flying
Old 07-03-2008, 11:00 AM
  #1006  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

Duber3 & Chasrb....I am just about at the same point as you guys. I am just finishing the Rx installation and expect to fire off the G26's this long holiday weekend. This has been a long road (for an ARF!) I am having the same compression issue with my retracts. Just the wing alone with the motors before the fuse is attached will compress the retract springs half way. This is gonna be a big fat fattie I suspect. While I typically break in engines in the air....I think I will run these on the ground quite a bit before pulling back on that right stick for the first time. I have installed Gyros on the rudder and aileron and am struggling now on whether to make them Normal/AVCS switchable or just leave them in normal mode all the time. I know I never want the rudder to be in AVCS mode but I think there will be times I would for the aileron gyro. Still deciding.... I will try to send some pics next week.

Blue Skies.......

Tom Rainwater
[email protected]
Old 07-09-2008, 06:21 PM
  #1007  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

UPDATE:
So the Tiger cat is very close to completion now. The threaded plunger rod on the nose wheel retract pulled out of the brass block that activates the re-tracts. I was able to thread it in deeper and cut off the excess to allow the cross rod clerence and JB Weld it back togehter so I hope it holds. The Right main retract is hanging in the up position (of course) and it is swiveling (loose) even though the set screws are tight so I need to pull it out of the plane and fix it. Otherwise it is ready to start the engines which I plan to do this weekend. When I put her on the balancing stands I was happy to see that the CG is currently about 1/8" forward of the suggested CG at 117mm from the LE of the wing. So good news no need to add nose weight. The bad news is the she already weighs 32.6 lbs (14.8 kg) as is. How does this compare to your finished weights? I will post some pics later this week.

Take care
Old 07-09-2008, 06:40 PM
  #1008  
My Feedback: (1)
 
Join Date: Aug 2005
Location: Omaha, NE
Posts: 98
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Am looking for comments on control surface throws, high rate, low rate, factory recommendations OK etc?

Thanks
Jack
Old 07-09-2008, 07:27 PM
  #1009  
Senior Member
 
Join Date: Dec 2002
Location: highland, MI
Posts: 275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

JB, THE THE SURFACE THROWS IN THE MANUAL ARE WHAT I USED ON MY FIRST T-CAT, THEY WORKED VERY WELL WITH THE DUAL RATES OFF ON ALL SURFACES. HAVEN'T POSTED IN A WHILE, T-CAT #3 IS ALMOST DONE, SOME RADIO AND AIRLINE WORK TO DO. I'M USING THE G-26'S AGAIN, THIS TIME THE CYLINDER HEADS HANG OUT THE BOTTOM OF THE COWL ABOUT 2 FINS OR SO,
(ON THE FIRST T-CAT THEY WERE COMPLETLY IN THE COWLS) SHOULD GET GOOD COOLING. WILL POST PICS SOON. I'M GLAD THIS PROJECT IS ALMOST DONE, BUILDING 2 T-CATS IN A YEAR HAS BEEN A CHALLANGE TO SAY THE LEAST...
Old 07-09-2008, 07:40 PM
  #1010  
Senior Member
 
Join Date: Dec 2002
Location: highland, MI
Posts: 275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

BLACKWIDOW, WOAH! THAT'S ABOUT 75 OZ. PER SQ. FT. FAT LADY. MY FIST T-CAT WAS 28 LBS. WITH FUEL AND THE G-26'S PULLED IT LIKE A 747, TONS OF POWER. THESE CATS ARE TYPICALLY HEAVY AND FAST. GLAD YOU CHOSE THE G-26'S.......
Old 07-09-2008, 07:54 PM
  #1011  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

VKerster,

I know it's a big fat fattie! I am worried about the power off glide ratio. How did yours do on appraoch to landing with flaps and lower power settings? I assume from your post about the fins on the 26's you may suspect overheating caused your engine out..yes?. My 26's have about 1 fin hanging out of the cowl but I have a failry large opening around the head. I hope it's enough!

Glad to hear you are putting another one in the air!

Take care
Old 07-10-2008, 05:21 AM
  #1012  
Senior Member
 
duber3's Avatar
 
Join Date: Oct 2005
Location: QC, QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Mine is finish, still waiting for my new gen 5 retract from KMP
Vk in your kit #3 do you have the Gen5 retract, if so are they better then the weak gen4 serie??

bye!
Old 07-10-2008, 08:41 AM
  #1013  
My Feedback: (53)
 
drifter's Avatar
 
Join Date: Sep 2002
Location: Baltimore, MD
Posts: 548
Likes: 0
Received 1 Like on 1 Post
Default RE: KMP F-7F Tigercat


ORIGINAL: duber3

Mine is finish, still waiting for my new gen 5 retract from KMP
Vk in your kit #3 do you have the Gen5 retract, if so are they better then the weak gen4 serie??

bye!
Here are some pics of the gen 4 and gen 5 retracts. There is no increase in mass. The parts are basically the same.
The main differences are air up and down (over center locks), and the struts plug directly into the gear instead of using a wire connector.

I waited 6 months for mine to arrive.

Attached Thumbnails Click image for larger version

Name:	Ig13657.jpg
Views:	50
Size:	30.7 KB
ID:	987311   Click image for larger version

Name:	Zv66755.jpg
Views:	50
Size:	37.1 KB
ID:	987312   Click image for larger version

Name:	Mr41474.jpg
Views:	62
Size:	52.6 KB
ID:	987313   Click image for larger version

Name:	Qk22876.jpg
Views:	63
Size:	27.6 KB
ID:	987314  
Old 07-10-2008, 10:53 AM
  #1014  
Senior Member
 
duber3's Avatar
 
Join Date: Oct 2005
Location: QC, QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Thank drifter for the pics!!
Kmp said they should receive it next week
2 months ago they said the same thing
anyway

thank!!
Old 07-10-2008, 11:11 AM
  #1015  
My Feedback: (53)
 
drifter's Avatar
 
Join Date: Sep 2002
Location: Baltimore, MD
Posts: 548
Likes: 0
Received 1 Like on 1 Post
Default RE: KMP F-7F Tigercat


ORIGINAL: duber3

Thank drifter for the pics!!
Kmp said they should receive it next week
2 months ago they said the same thing
anyway

thank!!
One thing; The scissors on the nose gear have to be turned around. Otherwise it hits the air cylinder and won't retract.

Chief Air says they have the F7F gen 5 retracts in stock, but KMP has trouble getting them...
Old 07-11-2008, 02:23 AM
  #1016  
Member
 
Join Date: Feb 2007
Location: OSTERHOFEN BAVARIA, GERMANY
Posts: 84
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Hi blackwidow,

dont worry about the weight.

My TC is about the same weight. Same luck that my CG was in place without additional weight. I placed teh RC-batteries behind the wing and CG was exact at 117mm.

On downwind leg I set 25° flaps and on short final full flaps 50°

She lands very smooth if I release elevator in the moment the main-wheels are touching the ground - if not she is bouncing heavily... [>:]

Regarding engine-heating I have made a balsa-plate to cover all teh rest of teh cowling, except the cylinderhead.

My Z-26 are turning a 3-blade MENZ 16x8 props with 7100 rpm and already I had one engine out as well...

Now I will test 15x8 3-blade and some 16x8 or 16x8 2-blade options in order to get about 8000 rpm on the ground to operate the Z-26 in the best range of power/torque.

I have spoken to a ZENOAH specialist in Germany and he told me, that we have to be very carefull with carburator-adjustment of the Z-26.

If the engine is setted up correctly for full-throttle and for idle, it may have the tendency to be lean in quarter- or half-throttle operation.

So we need to keep it on the rich side in idle and full-throttle in order to have correct half-throttle setting.

Other option is to use the Z-38 carburator, the ZENOAH guy told me.

I will test all options in a LASER 200 acrobat-plane before installing the engines back to my TC.

Cheers, Detlef
Old 07-11-2008, 11:30 AM
  #1017  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

Guys,

I could use the benefit of your experience and wisdom!

I am struggling with my nose wheel control linkage. I seem to have three basic problems (ok ok I have a lot more problmes than that but if I could get some advice on these three that would be a big help)

The first problem is the pull-pull linakge to the nose wheel. I am currently using DuBro sheilded wire with just a loop through the nose wheel control arm. However, when the nose wheel retracts and the wire becomes slack it frequently binds between the control arm and the plywood platform holding the retract and prevents the retract from fully retracting. Thinking about using high strength fishing line for more flexability but could use some ideas.

The second problem is that I don't have a good way to center the nose wheel as it is being retracted to it stays straight as it enters and exits the slim opening in the fuselage. I have considered springs and wires and rubber o-rings but I don't like any of them. Since these Gen - 4 retracts only use the internal spring to insure downward deployment I don't want to add any resistance that would hinder the retract from coming down.

The third problem I am having is that the nose wheel retract doesn't seem to have enough travel and even though the nose wheel itself is fully inside the fuselage when retracted the long thin gear door connected to the nose gear does not fully close. I have already shimmed the retract on the playwood platform to get more closure and I fear if I move it any more the nose wheel will not be enough forward when in the down position.

Any suggestions on these issues based on your expereince with this ariframe GREATLY appreciated!


Oh yes...while I am already begging for help........could someone explain to me how to insert pictures in my posts? I have been able to to upload them but where they went or how to then insert them into my post after they are uploaded I cannot seem to figure out....<sigh>

PS. Thanks Detlef for the post on weight and appraoch charateristics!

Blue Skies.....

Tom Rainwater
[email protected]
Attached Thumbnails Click image for larger version

Name:	Ec89635.jpg
Views:	89
Size:	140.5 KB
ID:	988335  
Old 07-11-2008, 11:57 AM
  #1018  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

OK that's hillareous! I posted my first attachment (by accident) in the message above where I asked how to do that. I tried the same thing yesterday but with no luck.

Let's try this again.................

Here are some picts of my project. The dummy raidals are from Aero Works and look good but are a bit heavy. The 16 x 8 props are from KMP...a bit pricey but they look nice. I painted the center section silver to simulate the hub. The pilot is a slimline pilot with a life jacket I had laying aroound from another pilot. The 9V battery you see powers the NAV lights and the strobe light. I am using all DuBro hardware and I opened each control surface to add hardwood blocks to allow me to secure the control horns without anything on the top surfaces of the control surfaces. (Likely where a lot of added weight was added). I am using gyros on the rudder and ailerons to (hopefully) give me a bit more time to realize what is going on and to correct if I loose an engine before it initialtes the death roll maneauver. I plan to use these in normal mode and not AVCS (heading lock) mode.

Take care

Tom Rainwater
[email protected]
Attached Thumbnails Click image for larger version

Name:	Tr49621.jpg
Views:	81
Size:	73.6 KB
ID:	988350   Click image for larger version

Name:	Gb88744.jpg
Views:	83
Size:	65.8 KB
ID:	988351   Click image for larger version

Name:	Bg92033.jpg
Views:	79
Size:	52.5 KB
ID:	988352  
Old 07-15-2008, 01:57 AM
  #1019  
 
CHARLES WINTER's Avatar
 
Join Date: Jan 2002
Location: MERCED, CA
Posts: 367
Likes: 0
Received 3 Likes on 2 Posts
Default RE: KMP F-7F Tigercat

Hi Tigercat builders, Been very busy and not much Tigercat time. I do have my 2 Fuji 24s mounted and broken-in. I sold my 2 RCV 91 engines. Have Sierra retracts and in the process of installing. A question to Sierra retract owners. I must add approximately 3/4 inch of plywood under the retract mounting area to raise it enough to allow the 110 degree main wheel retract into the nacelle so the tire doesn't hit the nacelle fiberglass. I called Sierra retract and spoke to Darrel and he said all I should need is approximately 1/4 inch. A 1/4 inch spacer is not enough lift. Anybody else have this situation?

Col. Chuck Winter
Old 07-15-2008, 05:26 AM
  #1020  
My Feedback: (1)
 
Join Date: Aug 2005
Location: Omaha, NE
Posts: 98
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Chuck

I used 1/4" plywood plus a 1/16" shim and clear just fine. Tire diameter?I am using 4.5" or else your plane is fabricated differently. Mine is +/- 3 5/8" from top to top of original i/4" plywood.

I am finally ready to start testing and maiden as soon as next flurry of work travel is over.

Jack
Old 07-15-2008, 07:59 AM
  #1021  
 
camdyson's Avatar
 
Join Date: Jul 2005
Location: Bairnsdale, AUSTRALIA
Posts: 870
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

Blackwidow,

Are you sure gyro on aileron is a good idea? If you have an engine out and subsequent swing/roll, the aileron gyro will tend to give opposite aileron, which could lead to a tip stall. Rudder gyro good, aileron not so sure.....

Just a thought. If you have the facility to switch the aileron gyro on/off in flight, you might want to (with alot of altitude!) switch the gyro on, idle back and give it a boot full of rudder to see what happens. If it's ugly, switch it back off.

My 2c only, others may well have more experience in this.

Cam
Old 07-15-2008, 10:26 AM
  #1022  
My Feedback: (10)
 
dasintex's Avatar
 
Join Date: Sep 2004
Location: Displaced Canadian in Central Texas TX
Posts: 2,601
Likes: 0
Received 0 Likes on 0 Posts
Default RE: KMP F-7F Tigercat

I agree with prev post; should only need Gyro on rudder; since I'm Canadian my 2 cents worth is about 2.1 cents now.
Old 07-15-2008, 04:47 PM
  #1023  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

Hmmmmm I'm not sure I understand the opposite aileron potential for the gyro during an engine out condition. Assuming both gyro's are in normal mode and no aileron inputs were given from the tranmistter why wouldn't the aileron gyro give control inputs to try to hold the wings level which is what you want regardless of the movement of the rudder? In full scale twins (aside from the mixture & prop controls) you identify the dead engine. push opposite rudder and raise the wing of the dead engine. Maybe I am missing something and if so I would really like to understand it better but I don't understand how the aileron gyro would drive the wings in the opposite direction. Thoughts?

Tom Rainwater
[email protected]
Old 07-15-2008, 04:51 PM
  #1024  
 
Join Date: Mar 2003
Location: Bend, Oregon
Posts: 109
Likes: 0
Received 4 Likes on 4 Posts
Default RE: KMP F-7F Tigercat

OK another subject...................

How do you guys transport your T-Cat's?

I am working on an idea to make a stand that would support the plane during transport and also provide a stand for assenbley at the field.

Anyone else tackled this issue already?

Thanks!
Old 07-16-2008, 01:10 AM
  #1025  
 
CHARLES WINTER's Avatar
 
Join Date: Jan 2002
Location: MERCED, CA
Posts: 367
Likes: 0
Received 3 Likes on 2 Posts
Default RE: KMP F-7F Tigercat

HI Jack, I'm using 4.5 dia. wheels. I don't mind adding extra plywood to raise wheel mount . I may also have to shim the mount to help the wheel clear the fiberglass nacelle. I don't want to put too thick of a shim under the mount because it will angle the strut forward. Ill keep you posted.

Col. Chuck Winter

Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.