912ULS stoppage during stalls

I like to make decisions based on as much evidence as is available.  I know of at least a dozen people who are NOT having any similar problems with the HACman.  I do not know what the denominator is, however.  

If I can figure out the reason for my troubles and it is related to the HACman, and it is not a resolvable problem, I will remove it.  But if it isn't related to the device, or if it is but the issue can be readily and definitively resolved, I'll keep it.  

I am not going to fly it until I know the answers, or until I can't find any.  Even then, before I entirely give up on the HACman or before I am comfortable assigning the fault solely to it, I'll disconnect the device, re-install the carb float bowl breather tubes, and go for a test flight.  

Suppose that doesn't resolve the issue! Then it either isn't related to the HACman or it is but something else is also wrong that needs to be fixed first.

Bud 

PS - if each float just needs to be under 3.5 g, why does Rotax say to throw a pair out without regard to whether one of them might be under 3.5 g?  Surely a scale that can discriminate at the 0.1 g level can weigh 3.5 g as easily as 7 g.

While I agree that the HACman might be a Solution Looking for a Problem, I do not think it is the cause of your issue.

Bryers Wrote:

If each float just needs to be under 3.5 g, why does Rotax say to throw a pair out without regard to whether one of them might be under 3.5 g?  Surely a scale that can discriminate at the 0.1 g level can weigh 3.5 g as easily as 7 g.

The floats were Manufactured as a Pair, Sold as a Pair,  Installed as a Pair, and Work as a Pair, so it follows that they will be Weighed as a Pair and Replaced as a Pair.

If one went bad the other isn't far behind.

If you found one at 3.4g and one at 3.7g would you really reinstall the 3.4g one and put the brand new 3.0g one on the shelf ???

Bill Hertzel wrote:

While I agree that the HACman might be a Solution Looking for a Problem, I do not think it is the cause of your issue.

Bryers Wrote:

If each float just needs to be under 3.5 g, why does Rotax say to throw a pair out without regard to whether one of them might be under 3.5 g?  Surely a scale that can discriminate at the 0.1 g level can weigh 3.5 g as easily as 7 g.

The floats were Manufactured as a Pair, Sold as a Pair,  Installed as a Pair, and Work as a Pair, so it follows that they will be Weighed as a Pair and Replaced as a Pair.

If one went bad the other isn't far behind.

If you found one at 3.4g and one at 3.7g would you really reinstall the 3.4g one and put the brand new 3.0g one on the shelf ???

 

 

 

Thanks, Bill.  That's what I understood to be the case.  If one of the pair is bad, replace them both.

But, here is my current dilemma.  
Maybe you can help me.

I have 4 floats that individually weight as follows:
3.80
3.77   
3.45
3.05  

Bill Hartzel is 100% correct!

"If one went bad the other isn't far behind"

Replace both floats with a new set and get rid of the old ones. Forget trying to mix match them and just buy new

I see it that you have one float that is good (3.05) and a marginal one (3.45) that is isn't far behind the two bad ones.

If you needed to make a single ferry flight back home I would use the pair.

Otherwise; It is Time for 4 new floats!  

I certainly would NOT buy a single pair (~3.0g) and re-pair them with the two heavy (3.5+) floats to produce two pairs under 7.0g; or even the marginal one for that matter. 

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Special request.

If anyone has any old floats lying around and would be willing to donate them for experimentation...

Please contact me via the e-mail listed below.

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If anyone has weighed a brand new pair of floats, please post what they weighed straight out of the box. Thanks!