Aeronca Champ STC help

Post-War Aeronca Champ airplanes
Post Reply
taylorj2cub
Posts: 9
Joined: Fri Jul 23, 2010 20:53
Contact:

Aeronca Champ STC help

Post by taylorj2cub » Fri Sep 10, 2010 16:50

I want to operate my Champ with an 85hp engine, but keep the small tail, I don't want the large dorsal fin. Does anyone know if an STC covers this installation?? Thanks in advance. Doug G.

kyleb
Posts: 286
Joined: Wed Jun 04, 2008 16:13
Location: Marietta, GA
Contact:

Re: Aeronca Champ STC help

Post by kyleb » Fri Sep 10, 2010 17:10

taylorj2cub wrote:I want to operate my Champ with an 85hp engine, but keep the small tail, I don't want the large dorsal fin. Does anyone know if an STC covers this installation?? Thanks in advance. Doug G.
Here's a link to the type certificate:

http://hangar9aeroworks.com/AeroncaTechInfo/A-759.pdf

If you'll look at "Note 4" it tells you that all you need to do is follow the Aeronca service letter (and presumably fill out the appropriate paperwork) to convert your 7AC to a 7BCM (edited - I originally wrote 7DC, which requires the big tail but gives a gross weight increase), which has a small tail and C-85. The only downside (IMO) is that you don't get a gross weight increase unless you go to the bigger tail.
Last edited by kyleb on Fri Sep 10, 2010 18:54, edited 1 time in total.
Kyle Boatright
Marietta, GA

RV-6 Built and Flying
Champ Restoration Underway

jepropst
Posts: 160
Joined: Fri Jun 20, 2008 17:44
Location: Elizabeth, West Virginia
Contact:

Re: Aeronca Champ STC help

Post by jepropst » Fri Sep 10, 2010 17:20

Service letter 14 covers the requirements for conversion to a C-85-8 engine and the Lasher STC covers the conversion to a C-85-12 engine. Both conversions permit the use of the small tail provided you comply with all the requirements of the service letter or STC.
John Propst
313 Hickory Grove Ln
Elizabeth, WV 26143
cell 304 588 3690
j.e.propst@ieee.org
N3129E 2WV3

taylorj2cub
Posts: 9
Joined: Fri Jul 23, 2010 20:53
Contact:

Re: Aeronca Champ STC help

Post by taylorj2cub » Fri Sep 10, 2010 17:33

John, I have a C-85-8, will that still fall under the Lasher STC??

kyleb
Posts: 286
Joined: Wed Jun 04, 2008 16:13
Location: Marietta, GA
Contact:

Re: Aeronca Champ STC help

Post by kyleb » Fri Sep 10, 2010 17:50

taylorj2cub wrote:John, I have a C-85-8, will that still fall under the Lasher STC??

You don't need an STC to install the C-85-8 if it is covered in the Type Certificate as part of the conversion.
Kyle Boatright
Marietta, GA

RV-6 Built and Flying
Champ Restoration Underway

jepropst
Posts: 160
Joined: Fri Jun 20, 2008 17:44
Location: Elizabeth, West Virginia
Contact:

Re: Aeronca Champ STC help

Post by jepropst » Sat Sep 11, 2010 03:01

As mentioned above, an STC is not needed for a C-85-8 conversion. You can install the C-85-8 provided you follow all the requirements of Aeronca Service Letter 14. You can download this and other service letters at: http://www.aeronca.com/docs/ServiceLetters/
You should review the service letter with your I/A and make sure that your planned conversion complies with each requirement of the service letter. You can't just pick and choose some but not all of the requirements unless you want to pursue a field approval for the deviations. The conversion is pretty straight forward. Upon completion your I/A will submit a 337 and record the conversion in your logs.
John Propst
313 Hickory Grove Ln
Elizabeth, WV 26143
cell 304 588 3690
j.e.propst@ieee.org
N3129E 2WV3

Bo Grave
Posts: 23
Joined: Wed Jul 07, 2010 06:06
Location: Spencer IN
Contact:

Re: Aeronca Champ STC help

Post by Bo Grave » Fri Nov 19, 2010 03:58

you need to do service letter 13 to get what you want. SL 14 puts on the dorsal, 13 doesn't but you don't get a weight increase. Just did this to my champ what a difference c85-8 with the 0-200 crank stc too much fun!!

Bo Grave
N1663E
Eugene ( Bo ) Grave
A&P, IA, R&E
CHAMP
CHIEF
BONANZA

Grumps
Posts: 793
Joined: Tue Jan 17, 2006 18:18
Location: Georgia GA10/OPN
Contact:

Re: Aeronca Champ STC help

Post by Grumps » Fri Nov 19, 2010 09:42

Having flow both with C-85, little tail and big tail--I will take the big tail anyday--with the increased torque it appears to be much more stable. Especially with the O200 crank C85 conversion. Just my two cents. Have a friend with a small tail Champ with a O200 in it with the Buzz Wagner conversion and he says it keeps your feet busy. He isn't impressed.

Doug
Keep the pointed end forward--
The dirty side down.....
And the blue skies on top....

MikeB
Posts: 3248
Joined: Wed Nov 17, 2004 15:07
Location: Western Wisconsin
Contact:

Re: Aeronca Champ STC help

Post by MikeB » Fri Nov 19, 2010 10:36

I've flown both big and little tail. Some like the original looks of the little tail but I agree with Doug, I think the big tail is a little more stable, especially in the air. On the other hand, there is more surface to creat excitement in a crosswind or when taxing on hard surface. We'll see how the L16 handles with the 0200 next spring (hopefully).

MikeB

User avatar
rkittine
Posts: 815
Joined: Mon Sep 13, 2010 10:48
Contact:

Re: Aeronca Champ STC help

Post by rkittine » Fri Nov 19, 2010 14:29

I also prefer the enlarged vertical dorsal and do not find it to severly effect the cross wind performance, though there is for sure more area into a cross wind.
Robert P. Kittine, Jr.WA2YDV
West Nyack Aviation, L.L.C.
New York, New York 631-374-9652
rkittine@aol.com

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests