Revenger 27 w/t Opti 250 XS

[ChrisRev92]

Hi to all,

I just finished my full rebuild project of a barn find Revenger 27, which was in an almost totalled condition, waiting for me for many many years..

Considering all various aspects including vfm rib was fitted with an optimax 250 XS.

Engine was fitted one hole before the lowest on transom.
Full on water (90lts tank placed in front of the console) and full on fuel (360lts tank placed in the original position almost center - back) and 3 person on board, boat made 49knots @ 5500 rpm with revo 4 21'.

From consumption figures and wot rpm, something is off, maybe high pitch for revo? Also below the prop slip calculated

Revolution 21
RPM LT/H Speed LT/M Slip
3500 40 26.5 1.51 25%
3700 45 28 1.61 24%
4000 55 34 1.62 14%
4200 60 35 1.71 16%
5500 -- 49 -- 10%


Any prop recommendation for this setup would be highly admired

Thank you in advance

[gtflash]

Prop recommendations are guesses. REV4 is a great prop and runs almost as fast as my laser, bravo and 25" raker2 on a twin stepped hull.

Back to basics. How high is prop shaft relating to bottom of boat. To increase RPM to WOT you can reduce prop size, remove a blade or lift engine height. I wouldn't do anything until engine height is established. Most ribs come buried far too low and the revenger is a great little fast hull.

As a comparison my 8.1m twin stepped runs 71mph on 25 rev4 or 66mph on 23 rev4. 71mph on raker2 with 700rpm left but planing is downwind with ballast upfront or she doesn't get up. Prop shaft is approx 4-6" above bottom of V. Water pressure gauge fitted and stable on a 2008 250ho etec without low water pickups and lightning gearbox.

Lovely vvvvvvvv noise from the slightly surfacing props.

[gtflash]

Roosters at dawn

https://youtube.com/shorts/26D-ll9rE...5rrlAwjzJfWoFO