Comp Arf Yak 55 2.6 Engine Install

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mpkooo · 01-15-2009, 01:09 AM

Does anyone have any advice on the best way to install a DA 100 on the Comp Arf Yak 2.6? Template to drill holes, shimes for engine torgue, Spacers etc?

I am new to giant scale gas airplanes and would appreciate any help or tips from anyone who has done this before.

Thank you

Tired Old Man · 01-15-2009, 02:27 AM

I have one with a BME 115 and unfortunately the way described in the Yak manual works out about the best. You can make a simple backplate template with some 1/8" ply and about 12" of 3/8" wood dowel to substitute as the prop shaft. The firewall already has some ofset built into it.

Do not install anything inside the fuselage until you have the engine final mounted. The gas tank and mount gets in the way of everything, and access to the back of the firewall is tough enough without having the tank in the way. The tank and tray go in last.

If you elect to use the manufacturer supplied rudder tray and servo arms take extreme care to mount the servo arms on the wheels exactly the same for each servo. Adjusting them to eliminate binding is near impossible if the arms are not positioned on the servo wheels exactly the same.

Nice thing about the Yak. You have a lot of "play" room for the distance you want the prop ahead of the cowl ring. Just about any amount looks good. Take your time and read the manual twice before you begin.

FENWAYFLYER · 01-15-2009, 06:47 AM

If for some reason you do not have the manual you can download it off the composite-arf website. You can also use one 8711 on each surface and simplify the setup a great deal.

Good luck you will like the plane, it is a great flyer.

Rick

pepatrick · 01-15-2009, 08:15 AM

I have owned 2 of the 2.6 Yaks and currently have a 3.0 Yak. This method works better than any described in the manual. It requires at least 2 people to help.

Take the fuse and place it vertically on its tail (leave the rudder off obviously). The tail obviously should be on a piece of foam to provide protection. Climb up on a ladder and set the engine on the firewall with the standoffs. Center it is muchas you can. Now...place the cowl on the fuse...take a ruler and measure the clearance from all sides of the prop shaft to the cowl opening. Measure every 90 degrees...Once you have the distance the same...on 12:00, 3:00 6:00 and 9:00...your engine is centered...Take a sharpie or other pen and mark the holes...Now your ready to drill your engine mount holes.

Another good idea is laminate the firewall with carbon fiber. It keeps the wood from compressing.

jmoesdad · 01-15-2009, 08:55 AM

hey guys im putting prides yak 55 back together and the swb spacers he gave me are labeled, but when i measured them they are all exactly the same. could the built in thrust line be all thats needed? the way he flew that thing im sure it was centered correctly.

FENWAYFLYER · 01-15-2009, 11:24 AM

I did not need anymore thrust than want the firewall had in it.

mpkooo · 01-15-2009, 01:06 PM

Thanks for all the great advice.

jmoesdad · 01-16-2009, 11:57 AM

has anyone found a build thread on the 2.6 yak?

gene6029 · 01-16-2009, 12:36 PM

I have the 2.6 w/DA-100. You have recieved good advice so far. I do not have any more thrust in mine than the firewall has. Hope we can help ya with any other questions ya might have.....Gene

Major3d · 01-16-2009, 12:47 PM

Firewall thrust is fine. DA 100 was the best motor I had in mine.

jmoesdad · 01-16-2009, 03:45 PM

do the pull pull cables cross or run straight on the 2.6 yak?

pepatrick · 01-16-2009, 05:39 PM

The 2.6 Yak is pretty easy to put together. You can make it even more simple by using a single 8711 on each inboard aileron servo mount and one 8711 on the rudder. This plane can be built with 5 servos plus a throttle servo and do anything you can throw at it. It tends to be tail heavy, so a DA-100 (old style) is ideal, but Im sure things can be positioned around to make the DA-100L work too. Take all your batteries and stuff them in front of the fuel tank...

With all the new technology out there, you can make a 100cc plane (espeically composite) as simple as a 50cc plane. I miss my old 2.6 Yak and would probably buy another one if I had scale back...I have a 3.0 Yak now and love it...but the 2.6 is a lot more fun to toss around in the air...It is much more 3d capable..

gene6029 · 01-16-2009, 06:52 PM

Jmoesdad, the cables go straight wo crossing......Gene

FENWAYFLYER · 01-16-2009, 07:09 PM

Mine are straight too.

jmoesdad · 01-16-2009, 09:05 PM

thanks guys, hope to meet you all at some events this year.

01-15-2009, 01:09 AM	#1
mpkooo Flyin' Around Join Date: Jan 2009 Posts: 2	Comp Arf Yak 55 2.6 Engine Install Does anyone have any advice on the best way to install a DA 100 on the Comp Arf Yak 2.6? Template to drill holes, shimes for engine torgue, Spacers etc? I am new to giant scale gas airplanes and would appreciate any help or tips from anyone who has done this before. Thank you

01-15-2009, 02:27 AM	#2
Tired Old Man Bad-ass Super Contributer! Join Date: Jul 2006 Location: California Posts: 4,323	Re: Comp Arf Yak 55 2.6 Engine Install I have one with a BME 115 and unfortunately the way described in the Yak manual works out about the best. You can make a simple backplate template with some 1/8" ply and about 12" of 3/8" wood dowel to substitute as the prop shaft. The firewall already has some ofset built into it. Do not install anything inside the fuselage until you have the engine final mounted. The gas tank and mount gets in the way of everything, and access to the back of the firewall is tough enough without having the tank in the way. The tank and tray go in last. If you elect to use the manufacturer supplied rudder tray and servo arms take extreme care to mount the servo arms on the wheels exactly the same for each servo. Adjusting them to eliminate binding is near impossible if the arms are not positioned on the servo wheels exactly the same. Nice thing about the Yak. You have a lot of "play" room for the distance you want the prop ahead of the cowl ring. Just about any amount looks good. Take your time and read the manual twice before you begin.

01-15-2009, 06:47 AM	#3
FENWAYFLYER Look at this stupid thing Join Date: Jan 2008 Location: Smyrna,De Age: 37 Posts: 1,004	Re: Comp Arf Yak 55 2.6 Engine Install If for some reason you do not have the manual you can download it off the composite-arf website. You can also use one 8711 on each surface and simplify the setup a great deal. Good luck you will like the plane, it is a great flyer. Rick __________________ I know that you believe you understand what you think I said, but I'm not sure you realize that what you heard is not what I said.

01-15-2009, 08:15 AM	#4
pepatrick Yak - Extra - Yak...yakity yak Join Date: Apr 2006 Location: Cumming, GA Age: 46 Posts: 2,216 Awards Showcase Total Awards: 2	Re: Comp Arf Yak 55 2.6 Engine Install I have owned 2 of the 2.6 Yaks and currently have a 3.0 Yak. This method works better than any described in the manual. It requires at least 2 people to help. Take the fuse and place it vertically on its tail (leave the rudder off obviously). The tail obviously should be on a piece of foam to provide protection. Climb up on a ladder and set the engine on the firewall with the standoffs. Center it is muchas you can. Now...place the cowl on the fuse...take a ruler and measure the clearance from all sides of the prop shaft to the cowl opening. Measure every 90 degrees...Once you have the distance the same...on 12:00, 3:00 6:00 and 9:00...your engine is centered...Take a sharpie or other pen and mark the holes...Now your ready to drill your engine mount holes. Another good idea is laminate the firewall with carbon fiber. It keeps the wood from compressing.

01-15-2009, 08:55 AM	#5
jmoesdad Chicks dig the beard Join Date: Dec 2007 Location: United States, FL, Orlando Age: 43 Posts: 602	Re: Comp Arf Yak 55 2.6 Engine Install hey guys im putting prides yak 55 back together and the swb spacers he gave me are labeled, but when i measured them they are all exactly the same. could the built in thrust line be all thats needed? the way he flew that thing im sure it was centered correctly.

01-15-2009, 11:24 AM	#6
FENWAYFLYER Look at this stupid thing Join Date: Jan 2008 Location: Smyrna,De Age: 37 Posts: 1,004	Re: Comp Arf Yak 55 2.6 Engine Install I did not need anymore thrust than want the firewall had in it. __________________ I know that you believe you understand what you think I said, but I'm not sure you realize that what you heard is not what I said.

01-15-2009, 01:06 PM	#7
mpkooo Flyin' Around Join Date: Jan 2009 Posts: 2	Re: Comp Arf Yak 55 2.6 Engine Install Thanks for all the great advice.

01-16-2009, 11:57 AM	#8
jmoesdad Chicks dig the beard Join Date: Dec 2007 Location: United States, FL, Orlando Age: 43 Posts: 602	Re: Comp Arf Yak 55 2.6 Engine Install has anyone found a build thread on the 2.6 yak?

01-16-2009, 12:36 PM	#9
gene6029 Bad-ass Super Contributer! Join Date: Sep 2007 Location: currently live in wilson nc Posts: 294	Re: Comp Arf Yak 55 2.6 Engine Install I have the 2.6 w/DA-100. You have recieved good advice so far. I do not have any more thrust in mine than the firewall has. Hope we can help ya with any other questions ya might have.....Gene

01-16-2009, 12:47 PM	#10
Major3d Super Contributer Join Date: Aug 2006 Location: Blue Springs, Missouri Posts: 115	Re: Comp Arf Yak 55 2.6 Engine Install Firewall thrust is fine. DA 100 was the best motor I had in mine.

01-16-2009, 03:45 PM	#11
jmoesdad Chicks dig the beard Join Date: Dec 2007 Location: United States, FL, Orlando Age: 43 Posts: 602	Re: Comp Arf Yak 55 2.6 Engine Install do the pull pull cables cross or run straight on the 2.6 yak?

01-16-2009, 05:39 PM	#12
pepatrick Yak - Extra - Yak...yakity yak Join Date: Apr 2006 Location: Cumming, GA Age: 46 Posts: 2,216 Awards Showcase Total Awards: 2	Re: Comp Arf Yak 55 2.6 Engine Install The 2.6 Yak is pretty easy to put together. You can make it even more simple by using a single 8711 on each inboard aileron servo mount and one 8711 on the rudder. This plane can be built with 5 servos plus a throttle servo and do anything you can throw at it. It tends to be tail heavy, so a DA-100 (old style) is ideal, but Im sure things can be positioned around to make the DA-100L work too. Take all your batteries and stuff them in front of the fuel tank... With all the new technology out there, you can make a 100cc plane (espeically composite) as simple as a 50cc plane. I miss my old 2.6 Yak and would probably buy another one if I had scale back...I have a 3.0 Yak now and love it...but the 2.6 is a lot more fun to toss around in the air...It is much more 3d capable..

01-16-2009, 06:52 PM	#13
gene6029 Bad-ass Super Contributer! Join Date: Sep 2007 Location: currently live in wilson nc Posts: 294	Re: Comp Arf Yak 55 2.6 Engine Install Jmoesdad, the cables go straight wo crossing......Gene

01-16-2009, 07:09 PM	#14
FENWAYFLYER Look at this stupid thing Join Date: Jan 2008 Location: Smyrna,De Age: 37 Posts: 1,004	Re: Comp Arf Yak 55 2.6 Engine Install Mine are straight too. __________________ I know that you believe you understand what you think I said, but I'm not sure you realize that what you heard is not what I said.

01-16-2009, 09:05 PM	#15
jmoesdad Chicks dig the beard Join Date: Dec 2007 Location: United States, FL, Orlando Age: 43 Posts: 602	Re: Comp Arf Yak 55 2.6 Engine Install thanks guys, hope to meet you all at some events this year.

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