Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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 Posted: Mon Apr 19, 2010 6:02 pm Post subject: Desser 4.00-6 8 ply and 6 ply LSA tire |
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Hi All,
I had a nice and pleasant chat with a Desser supervisor today. After installing these tires (4.00-6 8 ply) on a few of different aircraft here is what I have found and discussed with Desser. First these tires do not come pre-balanced and you will need to do that with some of the stick-on weights. It takes about 1.25 oz. of weight to balance these. I used the 1/4 oz. weights. I put some on the inside and out side of the wheel. No big sweat they balance right up in a couple of minutes.
Here is the big discussion. We started off with 30 psi on the 4.00-6 8 plys. At 30 psi these tires seem to have a flat spot and were all bad tires. Not so fast Hass!
Talking to Desser these tires are not meant to run that low. The pressure of 29 psi was for the original CT tires. They prefer to have at least 62 psi in these tires if possible. That is little too much for us so we decided on 55-57 psi and this took the so called flat spot out of the tire. These tires are absolutely dependent on having enough psi to keep them nice and round. Even with this if you hold a straight edge up to them they seem ever so slightly off. So I went out and checked 3 other aircraft with other tires and found exactly the same thing. No tire is 100% round and is dependent on the proper pressure to maint that roundness. The less pressure under the recommended the worse it became. It is the same for the 6 plys and other brands of tires from what I can find. When you balance these tires and inflate them to 55 psi you will not have any issues with vibration. I check my 6.00-6 tires and others and they were the same even though I didn't have to balance them. I am trying hard to get Desser to pre-balance these tires like they do the larger tires and I believe we have a good shot at this happening. I'll keep you informed as I do a little more research for Desser and get some feed back.
These seem to be good tires, but need proper inflation. How much psi are the old Italian Mark Engegno wheels good for, I don't know.
Like they used to say:
Stay tuned and don't touch that dial!
If your old you'll remember this saying and if you don't then you probably don't remember Might Mouse either. 
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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