Engine and Prop Q & A
I have an 0-360 and have not selected a prop. Do you have a recommendation fora non-CS prop at a reasonable cost?
From Danrihn@aol.com
I recommend using a Sensenich 76x62 Metal prop for the best peformance. If you want
wood, use a Sensenich wood prop, same diameter and pitch. I don't recomend any other
fixed pitch props. I am keeping a sharp eye on the Whirlwind props, I want to see
more time in the field for this company and their designs.
We are fitting the bottom engine cowling for a IO-360 engine on a One design. How do I determine the size (sq. in.) of the opening for the exhaust stacks and engine cooling air exit?
From: DDavila546@aol.com
based on experience, outlet size needs to be slightly larger than inlet size. At least 10% larger up to 50% larger, depending on how well you sealed your baffles and speed of the plane. since these airplanes spend a lot of time working in fairly slow speed regimes, I plan on about 140% outlet, after deducting the room the exhaust takes up. I haven't fit my cowl yet so am not sure how much i can really get. Take a look at Sean Tuckers new plane, he has "gills" on the side of the cowl for cooling exit in any attitude in addition to the bottom.
From : Danrihn@aol.com
A good rule of thumb is that the exit area should be 10% greater than entry area. Lower pressure at the exit allowing the air to flow from top to bottom.
In looking at drawings of the Airflow Performance Fuel Pump Package, I saw a note that the gascolator needs to withstand the outgoing pressure without popping. This had not occurred to me before. I know the Andair gascolator will work, but it is about three times the cost of other gascolators. What is everyone else using for gascolators and Aux. fuel pumps?
From: DDavila546@aol.com
Why use a gascolator at all? i threw mine away three airplanes ago and haven't missed it at all. A drain on the bottom of the tank to check for water and a GOOD inline fuel filter have worked well for me and I don't have to worry about the gascolator leaking or getting knocked off (both of which ihave seen, I bet you have too if you think about it.)
Are induction tubes a certain length and routing for a reason (like tuning), or can I get a tube with different bends in it to miss my cowl? I have been loaned a 205HP HIO-360 and the left front induction tube hits my cowl. I'd hate to put bumps into the cowl if I'll end up eventually with a new 180 straight-valve AEIO-360
From Danrihn@aol.com
I have seen the two front induction tubes modified to fit. Can't say for sure what this will do the performance of the engine. You can call Sky Dynamics, 540-297-6754 (ask for Kevin Murray) he is very knowledgeable on induction systems. He builds the cold air induction system.
Does anyone know why the Aircraft Spruce Catalog calls out a AEI0-360-B1H as the engine of choice for the DR-107, but the Lycoming document SSP-397 (listing all of their available engine models) doesn't have it listed? Is my SSP-397 out-of date?
From Danrihn@aol.com
This is an engine I speced out with Lycoming. It has a front mounted prop governor, a forward facing fuel servo (fuel injector RSA-5), light starter, heavy crank shaft flnage with no lightning holes. It was put together at my request and is the engine no on the OneDesign prototype. If you have ever seen this airplane fly with a smoke system, you have seen this engine fly in a One Design.
Are the "sixth and eighth order counterweights" a bad thing? Sounds like someone's solution to a resonance problem. 3. There are some engines which have "-A2G prop flange bushings" and others have the prop flange bushings rotated 120 degrees. Does any of this matter to me?
From: DDavila546@aol.com
6th and 8th order counter weights are good for smoothness but can be "detuned" by rapid throttle movement,(this from a Lycoming rep years ago)also they add weight, 1 or 2 lbs , we don't need any ballast in the front of these things do we? I plan on using a 200 in my project with a light prop...any of you guys with this combination care to comment on how it works for you? Enough of these things are flying now that we should be able to get some good feedback on flying as well as building...By the way Roger Rourkes cowl is made to fit a 200...i've got the cowl but not the engine so can't comment on fit yet
Hints and Tips
Starters
From: akrotodd@hotmail.com
Comments: Be careful when somebody builds you an engine and tells you you're getting a
"Lightweight Starter." I wrongly assumed I would be the proud owner of
either a B&C or a Sky-Tec on my IO-360-A1A, but instead I got a car starter on a funky
bracket. If I want to use this thing, it means putting a bubble in the front of my
cowl to clear a boss that doesn't exist on the airplane lightweight starters.
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