The C26 is a comfortable boat. We have owned our C26 going on 5 season 430 hours and hopefully heading to Florida to spend the winter. As Gavin said it may be slightly underpowered. 20 kts is the best I have ever seen at 4150 rpm. 18.5 kts is top speed for my boat 4030 rpm with Dinghy and motor on board.
List of things to look for with surveyor
*Motor mounts tight ? and lag bolts tight? ( the engine mounts anchor into wood )
*Check all limber holes for proper drainage. ( battery storage compartments have wood floors, if the limber holes don't drain properly there may be rot.
* The engine thru hull is 1" Volvo requires 1 1/4" for the D3. The 1 " works has long as there is no raw water fouling. 178 F @ 2250 , 180F @ 3200, 183F@ 3400 , 192F @ WOT 3940 rpm to 4150 rpm. Temperatures above this would indicate issues with cooling system.
*120 V shore power 30 amp system is marginal if marine air is installed. Inspect wire connections a shore power receptacle in cockpit, connections at ELCI under microwave in cabinet. Inspect all connections in power panel. I have found terminal connections loose at each location, burned connectors at the shore power receptacle and at breaker panel
* Rudder post bonding wire is to short and pulls out of connector leaving the rudder assembly non-bonded
* engine compartment poorly ventilated. Check engine compartment temperature while running. Temperature at engine intake air filter reaches as high as 160F. I believe the C26 is the only model that see's intake temperature this high because the engine is mounted forward under pilot house deck and there is limited air flow.
* inspect turbo to after cooler hose. It is a short silicone hose that is held inplace with a hose clamp on each end if it becomes loose it will leak traces of oil and leak air. I had the hose fail. Turbo was replaced when hose was replaced. I upgraded hose clamps when new hose and turbo was installed.
* inspect the water pump serpentine belt tensioner to confirm it is working properly (it corrodes and binds)
* inspect for moisture in the swim platform. Inspect that all mounting hardware is properly sealed.
* Check full boost pressure WOT 28 psi, high cruise 24 psi
* inspect deck drains for proper draining and no leaks
* inspect that exhaust thru hull is bonded.
The surveyor will inspect engine ,alignment, cutlass, hull, 12V system......
The C26 has marginal sized trim tabs. Drop fins really helps bring the bow down.
I have photo's of modifications and repairs in my album.
Good luck with the Survey. My list is based on things that I have repaired or had issues with.
The C26 handles quite well in 2 to 3' sea's providing a stable ride. I have had it in 4 to 5' without issue, waves above 5' it handles the waves but it is not fun.