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

KMP F-7F Tigercat

Reply
Old 08-09-2012, 04:40 AM
  #2026
dgiatr
 
dgiatr's Avatar
 
Join Date: Jan 2009
Location: petralona, GREECE
Posts: 283
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

7 times so far and tigercat flies really well..... so well that i nearly crashed it one week ago! i was at last turn before landing and i said to myself " this plane flies really nice almost like a single engine plane!" at that time i was having a really steep low speed right turn!, and i suddenly decided to fully open throttles from idle! ( i know all mistakes at the same time!!)...tigercat suddenly had that famous "spiral death" and it went down while spinning for about 4 or 5 turns ( i dont remember!!...its like a bad dream!), at about 3 metres from the ground i managed to stop it from spinning ( i cut throttles to idle and put down elevator, nothing else) and plane started flying level! but with the same direction to the wind, i didnt realised what really happened and i thought that i had lost one engine so i let it flying with zero throttles until it stalled at about one metre from the ground causing one leg and a small part of centre wing panel broken! i have twinsync on it and i am very happy with it but the conclusions is that you have to respect twin engine planes they are not single engine planes and you have to : open throttles really softly, take wide preferably left turns and pay attention to keep speed up specially while turning especially i would say that when plane speed is low (while turning or landing ) you have to be very carefull to sofly open throttles because every difference in engines rpm at that time can cause plane instability.
Attached Thumbnails
Click image for larger version

Name:	Zx72465.jpg
Views:	27
Size:	19.5 KB
ID:	1790457   Click image for larger version

Name:	Sn42225.jpg
Views:	27
Size:	19.5 KB
ID:	1790458   Click image for larger version

Name:	Ms42877.jpg
Views:	29
Size:	20.4 KB
ID:	1790459  
dgiatr is offline  
Reply With Quote
Old 08-09-2012, 12:32 PM
  #2027
stoat
 
stoat's Avatar
 
Join Date: Jan 2005
Location: new plymouth, NEW ZEALAND
Posts: 496
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Hehe, yep a good leson learned! Fantastic that you got away with it without too much damage.
This is why I love twins - because they require more thinking while flying and demand a little respect it stops many people from trying them, so its that much cooler when one is flown.

And its a cool cool plane!

http://www.vintagewings.ca/VintageNe...Wagon-Rut.aspx

Cast your bo peeps over the link. A little inspiration for us all....
stoat is offline  
Reply With Quote
Old 08-09-2012, 02:21 PM
  #2028
sabrejet
 
Join Date: Sep 2003
Location: Colorado Springs, CO
Posts: 47
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Have any of you T-CAT guys made this F7F electric powered? I have the KMP Tigercat also and not sure which way to go with powering it yet.

Any great comments would help!

Keith
sabrejet is offline  
Reply With Quote
Old 08-09-2012, 02:43 PM
  #2029
stoat
 
stoat's Avatar
 
Join Date: Jan 2005
Location: new plymouth, NEW ZEALAND
Posts: 496
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

A couple of the guys here have done elec versions. Nice but you dont get that great twin sound! Weight seems to be around the 30lb mark too.
stoat is offline  
Reply With Quote
Old 08-09-2012, 02:44 PM
  #2030
ysolomon
 
Join Date: Dec 2006
Location: Plano, TX
Posts: 56
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

I'm making it electric, but have been working on it on-and-off for a while now, so it will likely still be a while before I'm done.
ysolomon is offline  
Reply With Quote
Old 08-14-2012, 01:34 AM
  #2031
dgiatr
 
dgiatr's Avatar
 
Join Date: Jan 2009
Location: petralona, GREECE
Posts: 283
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat


Quote:
ORIGINAL: dgiatr

7 times so far and tigercat flies really well..... so well that i nearly crashed it one week ago! i was at last turn before landing and i said to myself '' this plane flies really nice almost like a single engine plane!'' at that time i was having a really steep low speed right turn!, and i suddenly decided to fully open throttles from idle! ( i know all mistakes at the same time!!)...tigercat suddenly had that famous ''spiral death'' and it went down while spinning for about 4 or 5 turns ( i dont remember!!...its like a bad dream!), at about 3 metres from the ground i managed to stop it from spinning ( i cut throttles to idle and put down elevator, nothing else) and plane started flying level! but with the same direction to the wind, i didnt realised what really happened and i thought that i had lost one engine so i let it flying with zero throttles until it stalled at about one metre from the ground causing one leg and a small part of centre wing panel broken! i have twinsync on it and i am very happy with it but the conclusions is that you have to respect twin engine planes they are not single engine planes and you have to : open throttles really softly, take wide preferably left turns and pay attention to keep speed up specially while turning especially i would say that when plane speed is low (while turning or landing ) you have to be very carefull to sofly open throttles because every difference in engines rpm at that time can cause plane instability.
ok! after some wing and landing gear repairing tigercat is ready to fly again, with cowls on it that time, i will wait for a little because temp here is really high , i am thinking of flying it at the beginning of september.
dgiatr is offline  
Reply With Quote
Old 08-29-2012, 12:16 AM
  #2032
dgiatr
 
dgiatr's Avatar
 
Join Date: Jan 2009
Location: petralona, GREECE
Posts: 283
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

a question for nitro or gas tigercat owners :
whats the maximun possible difference in r.p.m. between the two engines that you let your model fly;...say 500 rpm difference at 15-20%% throttlle travel is that acceptable or not;...i know that everything is relevant to speed that your models would have at that time so lets say that 500 rpm difference happens when model speed is low or while landing with full flaps at about ,say 1 metre from the ground
dgiatr is offline  
Reply With Quote
Old 08-29-2012, 07:40 AM
  #2033
rcnut101
 
Join Date: Nov 2005
Location: Raleigh, NC
Posts: 76
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

No More than 200 rpm!
rcnut101 is offline  
Reply With Quote
Old 08-29-2012, 03:45 PM
  #2034
stoat
 
stoat's Avatar
 
Join Date: Jan 2005
Location: new plymouth, NEW ZEALAND
Posts: 496
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Better still, nothing. More critical to have them matched at low rpm.
stoat is offline  
Reply With Quote
Old 09-02-2012, 02:05 AM
  #2035
cordline
 
Join Date: Mar 2007
Location: Lathlain, AUSTRALIA
Posts: 30
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

I have 20cc Zenoahs in mine and initialy tried a Twin Sync but i could not isolate RF problems so i gave up on it.
I put a Rate Gyro on the Rudder and any difference in RPM is not such an issue.

Cheers
Wayne
cordline is offline  
Reply With Quote
Old 09-03-2012, 04:50 AM
  #2036
dgiatr
 
dgiatr's Avatar
 
Join Date: Jan 2009
Location: petralona, GREECE
Posts: 283
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Thanks for the info!
i would like to ask those of you using twinsync ,whats the lower limit that you have set twinsync to engage , say from about 2700 rpm is that very low or not; if yes then whats the possibe problems that might have such a low setting; ( i mean to set twinsync to work from 2700 rpm and above), manual says something about that but to be honest i dont get it!...in my tx and with my own settings i get 2700 rpm after two clicks above idle ( i have high idle in case.....)
Thanks!
dgiatr is offline  
Reply With Quote
Old 10-01-2012, 09:42 AM
  #2037
Ratus
 
Join Date: Jul 2011
Location: Péruwelz, BELGIUM
Posts: 8
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Hello all,

First fly of my tigercat and 2 vidéo's.

[youtube]http://www.youtube.com/watch?v=atYZAlFfAdM&feature=relmfu[/youtube]
[youtube]http://www.youtube.com/watch?v=UEPcYIEY-R0&feature=g-all-u[/youtube]

Alain
Ratus is offline  
Reply With Quote
Old 10-02-2012, 07:54 PM
  #2038
Ron McGrath
 
Join Date: Jun 2002
Location: Rochester, NY
Posts: 247
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

What engines do you have in your TC?
Ron McGrath is offline  
Reply With Quote
Old 10-02-2012, 10:32 PM
  #2039
Ratus
 
Join Date: Jul 2011
Location: Péruwelz, BELGIUM
Posts: 8
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Hello Ron,

it's 2 91 4 stroke (P.H.) copy of OS. and 2 master airscrew propeller 13X8

Alain
Ratus is offline  
Reply With Quote
Old 10-04-2012, 12:07 AM
  #2040
Ratus
 
Join Date: Jul 2011
Location: Péruwelz, BELGIUM
Posts: 8
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat



Ratus is offline  
Reply With Quote
Old 12-08-2012, 06:43 PM
  #2041
70sflyer
 
70sflyer's Avatar
 
Join Date: Sep 2004
Location: Atkins, IA
Posts: 11
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Just received my f7f Tigercat,Fuselage has damage ,so I need to get that fixed.Will do electric,Im thinking 60 mtrs,2-80 amp ESC ,26s 5000 batts ,Let me know what you are doing.This big twin is going to be different than my other twins.
70sflyer is offline  
Reply With Quote
Old 01-04-2013, 12:51 PM
  #2042
donddsms
 
Join Date: May 2005
Location: Cincinnati, OH
Posts: 127
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Hello Airraptor,
I am doing this backwards! I received my Tigercat three weeks ago, along with ESM electric retracts, and NOW I just completed reading this thread that started years ago! I am truly greatful to all the hard work and documentation presented in this thread, and I can see this is going to be the longest and most difficult build I have ever attempted. I am wondering, are you satisfied with the retracts? I notice a lot of pilots seem to eventually switch to the Sierra retracts. Thanks. I will be checking back here frequently. This thread would make an excellent hard-bound edition!
Don
donddsms is offline  
Reply With Quote
Old 01-04-2013, 12:54 PM
  #2043
donddsms
 
Join Date: May 2005
Location: Cincinnati, OH
Posts: 127
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

I also understand there is a parallel tigercat build thread, but I have been unable to locate it. Can anyone give me a link to it?
Thanks.
Don
donddsms is offline  
Reply With Quote
Old 01-04-2013, 02:01 PM
  #2044
rlinus
 
Join Date: May 2007
Location: , PA
Posts: 21
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

I am in the same boat as you. I just got the plane about a month ago, didn't get the retracts yet. I haven't started building anything yet. Still deciding on which engine to use and how I'm going to do the retract doors, removable outer wing panels etc.. Think I'm going to go with an OS 120 4 stroke. I agree this one is going to take awhile. Keep posting!
rlinus is offline  
Reply With Quote
Old 01-04-2013, 03:53 PM
  #2045
Rocketman_
 
Rocketman_'s Avatar
 
Join Date: Oct 2003
Location: , MA
Posts: 1,267
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat


Quote:
ORIGINAL: donddsms

I also understand there is a parallel tigercat build thread, but I have been unable to locate it. Can anyone give me a link to it?
Thanks.
Don
Are you referring to the ASM F-7F Tigercat thread?

http://www.rcuniverse.com/forum/m_90...tm.htm#9096477
Rocketman_ is offline  
Reply With Quote
Old 01-04-2013, 08:59 PM
  #2046
Ron McGrath
 
Join Date: Jun 2002
Location: Rochester, NY
Posts: 247
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

I have a set of OS 120 sp (super charged) 4 cycles that I was thinking if I got sick of the E setup I could put in my Tigercat but it would be a minimum of 3 less HP and that would make me sad.
Ron McGrath is offline  
Reply With Quote
Old 01-04-2013, 09:14 PM
  #2047
tom_sandiego
 
tom_sandiego's Avatar
 
Join Date: Nov 2005
Location: San Diego, CA
Posts: 319
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Quote:
ORIGINAL: rlinus

I am in the same boat as you. I just got the plane about a month ago, didn't get the retracts yet. I haven't started building anything yet. Still deciding on which engine to use and how I'm going to do the retract doors, removable outer wing panels etc.. Think I'm going to go with an OS 120 4 stroke. I agree this one is going to take awhile. Keep posting!

Call or email Lenny at Lenny@shindinmachine.com for the retracts, he custom made for my tigercat way better than Sierra retracts. You can see my photo in his website http://www.shindinmachine.com/pilotprojects2010.html.

and this one for 3 pieces wing http://www.rcuniverse.com/forum/m_86...tm.htm#8655593
tom_sandiego is offline  
Reply With Quote
Old 01-05-2013, 04:27 AM
  #2048
Sundownee
 
Join Date: Aug 2002
Location: Windsor , ON, CANADA
Posts: 257
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Hi guys, I myself have been watching this thread for awhile also. I picked up a full composite kit last month from here NIB with full Sierra retract gear, wheels and struts. Going to use Saito 200R3 radials, already picked one from here the other day NIB.
RCU always has been a great place to shop to find things and save some money.
I believe this project is going to be a longer build myself. Still looking for other parts needed as servos and etc.
Might start a new thread on this build.
Keep the posts coming guys, lots of great ideas.

Paul Sousa
Sundownee is offline  
Reply With Quote
Old 01-06-2013, 08:22 AM
  #2049
donddsms
 
Join Date: May 2005
Location: Cincinnati, OH
Posts: 127
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat

Thanks all for the information. At the moment pondering engine choice. I wanted to emulate Col. Winter's efforts with Fuji 24's, but they have been out of production for awhile. CRJDriver (Chris) I think used Zenoah G20's and loved them? Pylon2 also used G20's with no nose weight. Grossy2 are you happy with the GR26i's? I have noticed positive references to DLE 20ei's also. At the moment I'm leaning towards the G20's, but thinking hard on the DLE 20s.
I am very much open to suggestions/advice. Thanks.
Don
donddsms is offline  
Reply With Quote
Old 01-06-2013, 08:32 AM
  #2050
rcnut101
 
Join Date: Nov 2005
Location: Raleigh, NC
Posts: 76
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KMP F-7F Tigercat


Quote:
ORIGINAL: donddsms

Thanks all for the information. At the moment pondering engine choice. I wanted to emulate Col. Winter's efforts with Fuji 24's, but they have been out of production for awhile. CRJDriver (Chris) I think used Zenoah G20's and loved them? Pylon2 also used G20's with no nose weight. Grossy2 are you happy with the GR26i's? I have noticed positive references to DLE 20ei's also. At the moment I'm leaning towards the G20's, but thinking hard on the DLE 20s.
I am very much open to suggestions/advice. Thanks.
Don

Either engine choice will be fine, My first one had G-20's and pulled good. I'm finishing my second one with G-26's. If I had it to do all over, I would have used big 4 stroke glow due to being a lighter setup. Keep the model as light as you can.
rcnut101 is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 06:06 AM.