Search found 2033 matches

by Antoine
Fri Aug 07, 2020 10:25 pm
Forum: DA40 Forum
Topic: Corked Nose Wheel
Replies: 119
Views: 15775

Re: Corked Nose Wheel

In cruise, the "ball" was just slightly off to the left, enough to bug me if it were persistent,. Steve you can play with the size of the fin to get the ball centered. Mine initially was initially too large, but when reduced to the size on the pic page 1 of this thread the plane was perfectly coord...
by Antoine
Wed Jul 29, 2020 9:31 pm
Forum: DA40 Forum
Topic: Corked Nose Wheel
Replies: 119
Views: 15775

Re: Corked Nose Wheel

Hi Steve Metal is probably not great for damping in this highly turbulent flow area. You need a stiff structure to resist the prop blast and internal damping to avoid it becoming a resonator that’s triggers some unexpected effects. I used a plywood core: this allowed me to easily carve it into an ai...
by Antoine
Thu Jun 25, 2020 5:24 pm
Forum: DA50 Forum
Topic: Finally the Launch??
Replies: 53
Views: 4200

Re: Finally the Launch??

According to the engine's data sheet the critical altitude is 8000 ft. Based upon my experience with an aircraft of the same MTOW and an additional 50 HP, I think 300 HP (actually even less, they claim 300 DIN PS, not 300 SAE HP) won't be enough to operate safely in high density altitude take-offs. ...
by Antoine
Thu Jun 11, 2020 12:17 pm
Forum: DA40 Forum
Topic: Power Flow
Replies: 71
Views: 10030

Re: Power Flow

I've never thought about this before. Is there a reason there isn't a SuperCharger that works on the exhaust? It seems like it would be a tiny amount of engine power to turn a fan that created a negative-pressure in the exhaust system. With a simple gate so that it didn't run as too powerful a vacu...
by Antoine
Mon Jun 08, 2020 4:21 pm
Forum: DA40 Forum
Topic: Why We Removed The Supercharger
Replies: 39
Views: 1820

Re: Why We Removed The Supercharger

With all due respect to both parties, I believe it would be wise to take this dialogue private.
It is very sad that this problem happened and I hope you find an amicable middle ground. good luck in the resolution and thank you for a very instructive and civil exchange
by Antoine
Fri Jun 05, 2020 12:18 am
Forum: DA40 Forum
Topic: Why We Removed The Supercharger
Replies: 39
Views: 1820

Re: Why We Removed The Supercharger

I want to say clearly that my only intent going forward is to understand, not point fingers. Chris: your aircraft being a 2008 must have the tuned exhaust which is good for a significant increase in climb rate versus non-Powerflow planes such as Brock's. If this is correct, I must pull back my state...
by Antoine
Thu Jun 04, 2020 8:33 am
Forum: DA40 Forum
Topic: Why We Removed The Supercharger
Replies: 39
Views: 1820

Re: Why We Removed The Supercharger

Chris I looked up the Cirrus reports files and they indeed support what you say: Brock too only allowed 29-30 inches at take-off and then throttled back to limit CHTs to around 400 F. This implies less power than the theoretical max. And yet enough that he was seeing a massive performance boost vs h...
by Antoine
Thu Jun 04, 2020 2:17 am
Forum: DA40 Forum
Topic: Why We Removed The Supercharger
Replies: 39
Views: 1820

Re: Why We Removed The Supercharger

Chris I unfortunately do not have the time to dig more in the Savvy files, but in a nutshell: - look at how Wayne operated his plane - he kept MP very low- he is a very prudent pilot and I know him for being very gentle on his engines. - your reference for performance should be the plane that suppor...
by Antoine
Wed Jun 03, 2020 11:38 pm
Forum: DA40 Forum
Topic: Why We Removed The Supercharger
Replies: 39
Views: 1820

Re: Why We Removed The Supercharger

Thanks Wayne :) Performance of SC planes should be massively better even at low altitudes because no DA40 can make 30 inches of MP after take-off. The price to pay is higher SFC, a big increase in FF and maybe wear, but if an engine overheats, something is wrong. The FAA would have denied the STC if...
by Antoine
Wed Jun 03, 2020 8:44 pm
Forum: DA40 Forum
Topic: Why We Removed The Supercharger
Replies: 39
Views: 1820

Re: Why We Removed The Supercharger

There was also a very detailed debate about inlet air temperature on Wayne's Pirep thread... Rich: is it not so that if mag timing is set incorrectly, CHTs are affected? As I said above I believe that FAT should be given the opportunity of presenting their analysis. My feeling is that something is w...