All things ballooning
I'm looking to build the quietest and safest Inflation fan out there.
Does anyone have any good ideas?
Awesome fan. Light, quiet and powerful.
Not once has my fan fallen over. Maybe if you didn't tighten the legs clamps then sure.
I'm very happy with the Ventry fan because of it's size, weight, lifting handles, fold out handles and integral spot light as well. As it sits way back from the mouth it doesn't shake up the skirt and can stay on throughout inflation.
One limitation that concerned an onlooker was that the pilot can't reach the off switch while hot inflating, so nothing's perfect!
As far as advise for building a better fan, I'd say the efficiency of the blade will allow smaller engines which will be quieter. Perhaps something radical like the Dyson Air Multiplier fans could be powerful enough? That would be the ultimate, safe and quiet fan! http://www.dyson.com.au/technology/airmultiplier.asp
I'm building a fan with 6 Blade "ScoopS'. I'm using a 13 HP honda with the new quiet/electronic ignition. I hope to run the fan at 2000-2200 rpm. The max torque for my honda is near that. Most fans run up to 3100 rpm. I have studied many, many fans and most use smaller motors that are running wide open.
In fixed wing aircraft the break through in noise reduction has been the use of higher horsepower engines and slower prop speeds.(2200 rpm red line vs 2700 rpm)
The fans make a lot more noise than the new honda motors. The Honda generators are very quiet and I can easily hold a conversation next to them.