5,6,7 Wing rib part numbers

[jmodguy]

Anyone know if there are any differences in the wing ribs other than the part number stamped on them? (27001 and 27002)
I stared at them for quite a while and could not see any difference.
On another note - anyone have a spare 27002 rib laying around?

[bumsteer]

I'm sure someone will correct me if I'm wrong. 27002 has thicker web (6mm vs 5mm) and 27002 has aluminum doubler for flaperon hinge

[Dave S]

Jeff,

Our S7 kit came with 18 each part number 27001 ribs. These were described as 5mm.

[jmodguy]

bum,
I'll take my calipers to the hangar tomorrow. I couldn't see any difference but I did not have anything to measure precisely with either

Dave
You do not have any 27002? I am building a KF 5 and it calls out the 27002 for hinge point ribs.
Thanks for the input

[bumsteer]

Jeff

Yeah I know they do look alike. Can't talk to the later models but on my 5 the big thing is the aluminum doubler for the hinge.I know the hinges are different on the 7. I don't have extra 27002's. Good luck.

Rick

[Dave S]

Jeff,

The inventory sheets called out only 27001....no 27002 parts were indicated. 27003 and 27004 were the R & L buttribs, but that was the only other 27XXX series parts.

Our ship was an early S7 - might be that there were some variations depending on the point in time when the kits were made.

[jmodguy]

Took my fancy Harbor Freight digital caliper to the hangar after work and the webs are the same thickness at 5.35mm on both part numbers. I'm guessing they are the same.
As for the hinge doubler, I do not think they came installed on the 5 ribs.
The owner before me (I'm #3) updated the flaperon hinges to the 7 type.
Thanks Dave and bum

[VP-22]

Thanks Rick:
I have a 4-1200; manual says 1992. I appreciate the measurements and advice. I spoke with John on Monday. The parts (#22908) cost $3, less than the shipping so I thought why not make them myself. John didn't have the exact specs (on hand) thus my inquiry here. I've since decided to order them. Seems it's not as easy as it first sounded, as efwd pointed out, and as a first time builder, I've got my hands full just assembling this wing let along making my own parts! I did install the plywood doublers today, so that's progress! And yes, thanks, John was very clear about the difference between the 7 and Classic IV flaperon hinges, pointing out that you can't use the 7 hinge on the older wing set up. I guess that hinge has advantages over what I have and some people adapt it somehow. Anyhow, I just emailed in my order and added some Hysol to justify the shipping.

Bruce

[VP-22]

Hey Jeff: Never saw a final word on the rib question. I just bought a used kit and half my ribs are 27001, the other ones are unmarked and identical. An AP friend said i could reinforce the rear web myself with wood just to be safe. Bruce

[jmodguy]

Some have a reinforcement doubler on the inside of the cap strip at the rear spar location. I am not sure if this was factory or by builder. I don't have access to my hanger right now because they are painting the hangars. I'll see if I can get to my manual tomorrow or this weekend.