The unorthodox Jets scored three first-half tries then prop Rod Griffin charged over for a fourth in the 69th minute to ensure a second straight national club title for Queensland after Northern Pride had accounted for Penrith in the inaugural interstate club decider last year.

The triumph was especially sweet for Ipswich co-coaches Ben and Shane Walker, who applied for the Newcastle NRL coaching vacancy two months ago but were not even granted an interview.

A 90-metre try by Ipswich speedster Marmin Barba two minutes before half-time gave the Queensland Cup premiers a 20-6 lead at the break.

Newcastle made too many handling errors to build any pressure on the Jets and paid for their mistakes.

The Jets jumped to a 6-0 lead in the third minute when hooker Matt Parcell was allowed to run from dummy-half and stepped past back-rower Lachlan Fitzgibbon to score next to the posts.

Newcastle had a chance to level the scores six minutes later when fullback Jake Mamo found space on the right edge and popped a pass to Ken Tofilau but replays showed the winger dropped the ball over the line.

That missed opportunity proved particularly costly when Billy McConnachie crashed over under the posts for Ipswich's second try just three minutes later.

Fullback Carlin Anderson converted from in front to extend their lead to 12-0, then added a penalty goal in the 20th minute for 14-0.

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Newcastle hit back in the 29th minute when hooker George Ndaira burrowed over from dummy-half to score near the posts, then converted to cut the deficit to 14-6.

The Knights threatened to score again in the 38th minute but back-rower Marvin Filipo spilled a pass 10 metres out from the Ipswich line.

Prop Rod Griffin picked up the loose ball and off-loaded to Barba, who raced 90 metres to score, keeping chasers Honeti Tuha and Jaelen Feeney at bay, then Anderson converted from the sideline to give the Jets a 20-6 lead.

Feeney charged on to a Ndaira pass to score under the posts three minutes into the second half to trim the margin to 20-12.

The Knights set up camp in Ipswich territory for the next 20 minutes but could not find a way through the Jets' defence.

Ndaira suffered an arm injury and was replaced in the 50th minute then Mamo followed him up the tunnel 11 minutes later after McConnachie felled him with a blow to the ribs in back play.

After the ensuing melee, referee Matt Noyen called out retiring Knights skipper Clint Newton and asked him to settle his players down.

"They're young, mate," Newton said.

Noyen said: "Well you're the old one", and Newton replied: "Yeah, very old."

Knights hooker Danny Levi was help up over the line in the 64th minute then Tofilau had a try disallowed two minutes later because centre Joseph Tapine's pass was ruled forward.

The Jets put the issue beyond doubt three minutes later when Griffin powered over to score near the posts and Anderson converted for a 26-12 lead.

Earlier in the day, former Knights back-rower Cameron Ciraldo coached Penrith to a 34-18 victory over Manly in the National Youth Cup (under-20s) grand final.

IPSWICH JETS 26 (M Parcell, B McConnachie, M Barba, R Griffin tries; C Anderson 5 goals) NEWCASTLE KNIGHTS 12 (G Ndaira, J Feeney tries; G Ndaira 2 goals) at ANZ Stadium. Half-time Jets 20-6. Referee Matt Noyen