Desser 850 Smooth Tundra vs 600

[runon]

Re: Desser 850 Smooth Tundra vs 600

Ohhh - right on, thank you !
Had a little delay due to personal stuff, but after tomorrow head back in the game.
PS - they definitely taxi pillow soft, will give you a report on the ranch strip as soon as she's OK to fly.
Thanks all, this is the BEST group of guys/gals

[runon]

Re: Desser 850 Smooth Tundra vs 600

Got to fly a Taylorcraft with these on them ... AWESOME!!!!!!
14 PSI pilot side, 13 PSI passenger

Absolutely lovely to land out in the fields.

[tim]

Re: Desser 850 Smooth Tundra vs 600

think you need to make a vid of this I would like to see this

[astjp2]

Re: Desser 850 Smooth Tundra vs 600

They look like cute little black marshmallows!

You are going to really hate your shinn brakes now....and landing on asphalt can be more of a challenge, when those larger tires grab hold....

[Nefj40]

Re: Desser 850 Smooth Tundra vs 600

I've got about 15 grass landings on mine already and I'll be landing on pavement tomorrow so I'll see just how grabby they are. My 8.00s weighed 13.5 so I lost 2lbs per side. I didn't think to take a peak, but I fully rebuilt my shinns and it don't quite hold at full power on grass but it may be sliding.
Funny, but it really didn't seem to cost me any airspeed. But, I really didn't jump up in size that much either.

[jstall]

Re: Desser 850 Smooth Tundra vs 600

thanks for the input, this is great thanks, now, would really like to
hear how they work how they iron out bumps and holes etc

all i really need to do is land in wheat field, but with stock tires and
pants don't want to shake er up. This would be fun and practicle for me
as i could fly to farm 100 miles land inspect my stuff and come home

js

[jstall]

Re: Desser 850 Smooth Tundra vs 600

What would be the diameter of these 850's

[Nefj40]

Re: Desser 850 Smooth Tundra vs 600

I never put a tape to them, but they are supposed to be around 22 tall. They're not big enough to save you if a great big badger hole ends up in your way. They really do smooth the small stuff out though. Rolling up from grass onto the tarmac I don't feel that sharp bump anymore. I've landed a lot in our bean stubble and wheat fields with my old 8.00s and I have no doubt that these 22's are going to make a big difference.

I better add, hard surface does scuff them up pretty good so they wont last as long as the heavier built tires. I don't doubt that my old 8.00s would have needed to be replaced because of age long before they would have showed cords. It's a small price I'm willing to pay. A noticeable change of vision over the nose too.

[PA1195]

Re: Desser 850 Smooth Tundra vs 600

Forward visibility 3-pt is reduced with big tires 26" and larger. I sit up on a pad almost to my skylight and still can't see straight ahead well with the tail down compared with other aircraft I've flown. The 8:50's diameter would be better for that aspect. If I had the energy I'd install a taller tail spring, like something from a Scout with maybe a missing leaf, or maybe a larger diameter tailwheel on the existing Taylorcraft spring and Scott 3200 tailwheel. The extra 4" forward that my engine and cowl goes doesn't help.

Having big tires when rolling rough or soft terrain can help avoid upset and damage, but if visibility is compromised the benefit may be exchanged for yet another problem.

Gary

[ifdale]

Re: Desser 850 Smooth Tundra vs 600

Yes forward visibility suffers with the bigger tires. I have the 26" Bushwheel Airstreaks and I'll make s turns sometimes when taxiing. Usually I'm looking either slightly to the left or right of center on the takeoff roll and while landing. With these tires I usually do a tail-low wheel landing, especially at rough/unimproved straps so I can see what's in front of me. Before I got the 26" Airstreaks I had Goodyear 8.50-6 6 ply which is a pretty stiff tire for our light planes. The new Desser 8.50-6 4 ply sounds pretty cool. I'd love to compare it to the Airstreaks

[PA1195]

Re: Desser 850 Smooth Tundra vs 600

Yes all good points. I as well want max lift at minimum air speed for takeoff and landing on rough terrain or under draggy conditions like floats and skis. Without flaps big tires offer that for an angle of attack to the relative wind in the mid-teens just prior to wing stall. With vortex generators that AOA can be increased slightly over a stock configuration.

So bigger tires help in that scenario. But we can't have it both ways...AOA, lift, tire cushion, and forward visibility. Wheel landings offer visibility but sacrifice some lift and airspeed. No mystery.

The challenge with the Taylorcraft wing versus others is attaining sufficient AOA to provide lift at low air speeds (and low Reynolds numbers). Except for the slight droop of leading edge it's a symmetric airfoil designed primarily for efficiency from available thrust and in the end, speed. Flaps are the general modification to improve that realm as are Gurney style flaps, and vortex generators which apparently reduce the tendency for leading edge airflow separation >10* AOA common to the airfoil.

It's not as easy to fly slow in a Taylorcraft as others with a different wing. But once airborne the power<>speed and range on fuel aboard pleases.

Gary

[akndrifter]

Re: Desser 850 Smooth Tundra vs 600

In AK the wind is always blowing, and slips help a bit with visibility. I never found the 26s to be too detrimental on my old B model for controllability. The 8.50s on my current F-19 are similar in over the nose visibility to the 26s with the short mount, but I will have to report back on the 29s. 8.50s are plenty capable on grass, gravel, and even some nice beaches.

[c tudor]

Re: Desser 850 Smooth Tundra vs 600

I have a pair of Desser 8.50s and TR20 tubes.
Tried to fit them today and found that the valve stems are short and straight, as opposed to the long angled ones that Shinn wheels like.
I spoke with Desser who tell me that this is the only tube available in this size.
I see that there are lots of angled extenders available, but does anyone have a cunning plan on which ones to use?

Strip was so wet that maybe floats may be a better bet.

Many thanks,
Chris.

[c tudor]

Re: Desser 850 Smooth Tundra vs 600

I have a pair of Desser 8.50s and TR20 tubes.
Tried to fit them today and found that the valve stems are short and straight, as opposed to the long angled ones that Shinn wheels like.
I spoke with Desser who tell me that this is the only tube available in this size.
I see that there are lots of angled extenders available, but does anyone have a cunning plan on which ones to use?

Strip was so wet that maybe floats may be a better bet.

Many thanks,
Chris.

[3Dreaming]

Re: Desser 850 Smooth Tundra vs 600

The Shinn wheel should use a straight stem, but it does need to be fairly long. I would either use a straight extender, or pull the valve stem in place, and use a thin nut to hold it in place.