Cessna 188
Conversion Offering
Davis Aviation offers engine upgrades for Cessna 188 Ag Wagon and Ag Truck models (excluding Ag Pickup and Ag Husky), replacing the IO-520 D with a 300 HP IO-550 D engine. This upgrade includes various propeller options to fit your needs.
Previously known as the “Bonaire 550,” this upgrade enhances performance with shorter takeoff rolls, faster climbs, and improved cruise speeds—continuing where Cessna left off in the 1980s. Many older propellers are now obsolete, making this upgrade a cost-effective solution.
Available propellers include:
- Hartzell Paddle Blade: 82” 3-blade
- Hartzell Top Prop: 80” 3-blade
- McCauley (Threadless Hub): 86” 2-blade
If you’ve already upgraded your propeller, most models are compatible with the IO-550 STC. Provide the model number, and we’ll confirm compatibility.
Our propeller kit includes a new propeller, spinner assembly, tachometer, MP/FF gauge, silicone baffling, shock mounts, standard hoses (with firesleeving available), hardware, placards, and STC paperwork. If you have a compatible propeller, we offer a partial kit without the propeller and spinner.
You can also purchase a propeller-only option now, with the option to complete the IO-550 upgrade later as you approach TBO, allowing you to spread the conversion cost over time.
IO-550 Conversion Improvements
- 400 inch lbs more torque over the IO-520 engine/15% More Horsepower at Cruise.
- Quieter operation: the noise level at 2700 RPM is greatly reduced with the 80 or 82 inch 3 blade propellers or the 86 inch 2 blade.
- 10-15 MPH additional swath speed improvement depending on propeller choice.
- 10%-20% better rate of climb at gross Continuous 300HP without limitations.
- Short field take-off 10%-20% less at full gross weight.
- Cost difference is normally offset by the added value to the plane.
Why Upgrade Your Older Cessna?
– Walter Raleigh.
Davis Aviation is focused on each customer’s needs and offers specialized service to a global clientele. We have over three decades of experience in aviation conversions and can help you with engine and propeller upgrades, other STC upgrades, parts, and more.
Upgrading your single-engine Cessna is as easy as 1-2-3!
Contact Us
Approve Your Quote
Get What You Need
Contact us with your needs and Cessna aircraft type to learn more!
Call +1-423-652-1113, Email dasi@charter.net or complete the form.
