Can I use 9010 bungees in place of 9090

[ifdale]

I have a 1941 Taylorcraft and have Terry's STC using the 1280# gross option. Long story short I'm having a hard time finding the 9090-CW's (I'm in Alaska and it's cold). The 9010HD-CW's are readily stocked in Anchorage and elsewhere....just wondering if those might work instead of the 9090's?

Isaac

[PA1195]

Re: Can I use 9010 bungees in place of 9090

The latter (9010's) is what my mechanic used. There's some discussion here somewhere about the difference in dimension between the cords you note, but the 9010HD-CW's seem to work. I'm not a mechanic and do what you or yours thinks is best.

Gary

(PS: the 9010's are stiff on skis even when warm so maybe a mix of regular and HD would be better?)

[Scott]

Re: Can I use 9010 bungees in place of 9090

With 65HP?
I think you'll be fine with the 9010HDs

[cvavon]

Re: Can I use 9010 bungees in place of 9090

The only place in the world that makes bungees is SBC industries in Scottsboro Alabama.Give Dave a call and he will make them for you Phone #256 599 9968 or 256 259 6609 great people to deal with.

[Hank Jarrett]

Re: Can I use 9010 bungees in place of 9090

Oh Lord! It isn't time for another group buy already is it?

Hank

[Buell Powell]

Re: Can I use 9010 bungees in place of 9090

Isaac,
The pre wars use 9" and the post wars use 10" bungees so since yours is a 41 it should have the flat covers on the bottom instead of the ones that are formed and use the 9" which are are the 9090s and the 9010s will be to long unless something has been altered or changed. I looked at a Wag Aero catalog and they list the 9090s but buying direct seems like a good idea or if Hank does get another group order I would be in for a set of the 9090s.

[3Dreaming]

Re: Can I use 9010 bungees in place of 9090

Isaac,
The pre wars use 9" and the post wars use 10" bungees so since yours is a 41 it should have the flat covers on the bottom instead of the ones that are formed and use the 9" which are are the 9090s and the 9010s will be to long unless something has been altered or changed. I looked at a Wag Aero catalog and they list the 9090s but buying direct seems like a good idea or if Hank does get another group order I would be in for a set of the 9090s.

Only the 41 Deluxe's had the smooth faired in flat bungee covers. The B*55/65 airplanes had the bump type bungee covers. The 10" bungees may work, but they are not correct for the airplane.

[PA1195]

Re: Can I use 9010 bungees in place of 9090

On my '41 there's no bottom wooden/faired/whatever you call it frame cover. The fabric covers the belly front to rear and the bungees and inner gear fittings extend below the belly a little. I bought and tried to fit the metal bumps but of course there's a gap. So we made a cold weather flexible fabric cover for wheels/skis to seal around the edge of the exposed bungee ends (to exclude exhaust), and another to completely cover the holes while on floats. Glued a rectangular piece of thin polycarbonate to the belly fabric and covered that with stits fabric. The flexible cold weather seal material then gets laminated between an aluminum external skeleton and the imbedded polycarbonate by PK screws.

The 9010HD-CW's are commonly used by many up here and work as expected with no adverse consequences that I'm aware of.

Gary

[Buell Powell]

Re: Can I use 9010 bungees in place of 9090

When I bought my 41 as a basket case it came with a new set of bungees which seemed OK until I put the wings on then it sagged about 2" which made the gear spread out and looked awful so I knew the bungees were wrong. After checking the numbers and finding out they were the 10" post wars I put a set of the correct 9" on and they still looked good years later when I changed them just because I thought I should because of age. I don't remember the exact numbers of the first ones and may be the 9010HD-CW's are stiff enough for it not to sag but the correct 9" do work really well for the pre-wars.

[PA1195]

Re: Can I use 9010 bungees in place of 9090

The 9010HD's may be too stiff for some that fly on small hard tires and routinely bounce landings. Mine have stayed tight against the axe handle bumpers for a couple of years yet flex some on skis. On flexible 26" Airstreaks I doubt they stretch much. Stretch can be noted by pulling down on the upper wing strut ends. Unlike Cubs with hydrasorbs they don't move much.

Gary

[ifdale]

Re: Can I use 9010 bungees in place of 9090

Gary, looks like I'm going to be able to round up some 9090-cw's... so I'm probably going to try that route. I wish I knew what bungees I have on currently and how old they are. Oh well. That said I did get the chance to compare the 9090 (regular) and 9090-cw side by side. It's interesting, the cold weather's I really couldn't stretch by hand at all. The regular 9090 was much softer and I could stretch it noticeably by hand. Form member Dick Smith is going to let me borrow his bungee tool and a couple of 9010hd-cw bungees to play with. It will be interesting to compare the two

[PA1195]

Re: Can I use 9010 bungees in place of 9090

Yes please let us know what you discover. For me "not correct" plays against my Harer STC for up to 1500# gross weight (my plane was selected by the builder to be 1280 with the same modifications). So I want bungees that do any potential job.

Gary

[Mark Bowden]

Re: Can I use 9010 bungees in place of 9090

To the question about date code, SBC makes mil-spec bungees and they have color code strips to indicate date of manufacture.

That code is per the attachment.

Also, SBC website is: http://www.sbcindustries.com/index.htm

Their product list gives aircraft application and diameter and length by part number.

The code is also in AC43.13, which recommends replacement, not require, at 5 years. Replacement is on condition due to cuts, wear, fraying, necking, elongation, etc...

Mark

[PA1195]

Re: Can I use 9010 bungees in place of 9090

A question please for those that know. Is there a physical/dimensional difference in fuselage or landing gear that requires different sized bungees? I assume so but haven't come across an explanation. I can see gross weight as a factor, but there must be another explanation.

Gary

[3Dreaming]

Re: Can I use 9010 bungees in place of 9090

A question please for those that know. Is there a physical/dimensional difference in fuselage or landing gear that requires different sized bungees? I assume so but haven't come across an explanation. I can see gross weight as a factor, but there must be another explanation.

Gary

I suspect that there is a difference, because there was also a difference in safety cable length.