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

[bumsteer]

FYI I checked my rib webs and there is a 1 mm difference. Also the doublers were factory installed on my 27002 ribs. Kit was purchased in 1998. Series V Outback. Obviously yours are different.

Rick

[jmodguy]

bum
I'm not sure what happened but the kit was ordered in 1995 and was a 1400 GW Safari. The spar tubes have .065 walls so that means they are the 1550 GW wings. Must have been some trading or upgrading going on somewhere in the 20 yrs before I picked it up.
I am going to assume these ribs are good to go due to Daves input that his ribs are all the same p/n.

[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