PPC – First Modifications

After getting my Powered Parachute (PPC) back home I wanted to start it up to see how it runs. The seller had sent me a video of the engine running but I wanted to see it for myself. It started up okay but ran pretty rough and would NOT idle correctly. If I brought the throttles back anywhere near their fully back position the engine would die. After talking to a friend who is pretty knowledgeable on PPCs and doing some online research I decided to remove the intake silencer. Most sources said they don’t really work all that well on quieting engine noise and don’t do anything to make the engine run better. So my first modification was to remove it.

Intake silencer installed on the engine. Started the removal process.

I unbolted the intake silencer and removed it from the engine.

Next I covered the carburetor intakes while I ordered the parts I would have to replace as a result of removing the intake silencer. First, I would need two air filters, one for each carburetor. Next I would need two new main jets as Rotax has a main jet recommendation for use with and without intake silencers and the jets are two different sizes. So while I was ordering the correct parts I covered the air intakes.

While the parts were on order I also decided to check the other components of the carburetor to make sure they were clean and correct. I checked the main jet, idler jet, needle jet, and jet needle (yes those are two different things) to make sure the correct parts were installed.

148?? Nope need a 158 main jet.
2.68 Needle Jet…. Yep, that checks out. Correct.
11K2 Jet Needle. Yes, that’s the right part.
45 Idler Jet… Yes, also correct. We’re in pretty good shape.

So after verifying and cleaning these jets and the needle I reassembled the carburetor and ordered two air filters and two 158 main jets.

After receiving the main jet installation is very simple. Remove the carburetor bowl (slide one clip out of the way and drop the bowl) and unscrew the main jet at the bottom of the carb. Screw the new jet in and replace the bowl. Next I put on the two new air filters.

Now after having verified the right parts in the carburetor it was time to adjust the idle. I went with Rotax’s standard recommendations to start with. Setting the idle speed on this carb is kind of like hitting a moving target. There are so many adjustments to make and every adjustment affects every other adjustment. Rotax recommended screwing in the air regulating screw all the way in and then back out 1/2 turn. They recommended screwing in the adjustment screw all the way in and then out 3 full turns. This is were I started and the only difference from these defaults was that I ended up screwing the adjustment screw out 2 1/2 turns. This gave me an idle speed of 2200 rpm with the throttle at the rearward stops. Now, here is the translation. The air regulation screw controls the idle mixture, so the closer you are to sea level, the richer it needs to be. The higher up you are, the leaner. What they call the adjustment screw actually just limits how far the throttle slide inside the carburetor will travel to the closed postion. So once you get the idle RPM running nicely with the air regulation screw, you set the minimum idle speed with the adjustment screw. If I were to give them names I would call them the idle mixture screw and the throttle stop screw.

Next I have to take the PPC out to the airport and do some full throttle tests. I don’t want to do that in my neighborhood because it’s way too noisy. More to come!

I Went And Bought A Thing

The bad news was that the flying club I belong to is closing down. I hate bad news. To console myself I started browsing Barnstormers.com for airplanes I couldn’t afford. I thought about the powered parachute (PPC) that I owned and I kind of missed it. I started looking at PPC’s on Barnstormers and all were either on the East Coast or where out of my price range. Then I stumbled on an ad for a Six Chuter PPC – call for details. I emailed the guy and got back a detailed list of what he was selling and for how much. His price was firm but it was a very good price for what he was offering. I put a deposit down on it on the spot. I ran the ad by my friend who has been into PPCs for years, got me into it. He agreed it was a smoking deal so I made arrangements to complete the purchase. The only problem, it was two states away from me almost on the Canadian border. About a 950 mile drive. One way.

No problem.

I asked Mrs. Flying Dutchman if she was up for a road trip. She hemmed and hawed a bit until I told her she could just ride with me half way and then stay in Bend, OR, our first overnight spot and spend the day shopping while I drove the rest of the way to pick up the PPC. She was sold.

We left home at the crack of 7:30am and started driving north from central California. Past Sacramento and up the Central Valley. We stopped off in Williams, CA to have lunch at Granzella’s. Delicous Reuben sandwiches and nice restaurant as well as the deli where we got the sandwiches. We stayed on I-5 until we got to Weed, yes, Weed and then jumped over to US 97 and took that past Klamath Falls all the way into Bend. It was kind of a whirlwind journey.

Klamath Lake
US 97 just goes on and on and on…

We got to our hotel in Bend, The Hampton Inn in the Old Mill District. We had dinner and pretty much fell into bed exhausted. We did take in some sights before crashing for the night. I got up and hit the road at 4:30am the next day and didn’t get back until midnight. It was a grueling drive up to Chewalah WA which is about 30 miles north of Spokane, and about 30 miles from the Canadian border! I didn’t take many pictures. Here are a couple I managed to grab on my way up.

Cristy enjoyed her day in Bend however. Here are a few photos that she took.

So all that driving… what the heck did I come home with?

When we finally got back home we were completely exhausted but at least I know I got a great deal. Now to go over it with a fine tooth comb and make sure it’s airworthy. More to come!