Christian Lucas
Well-Known Member
- Joined
- Aug 23, 2012
- Messages
- 339
Hi,
i start this tread as i want to show you my thought ,to set the sponson back to the cg.
I want this for SAW and for Oval racing as the rigger will less cickt by a wave at the bow .
Most waterairplane start with a design where the sponson are placed near the wing and the end of the sponson is often behind cg. As i want not to fly i will not use a wing or say a very small wing like a rotorblad from helicopter and very tini sponson .For start the rotorblad will be under water acting as a hydrofoil and there it will produce lot of lift .But when the boat is faster and going out of the water with the blade this lift will breack down doing hydrogliding and the rigger has to step up on the small sponson. To ad moore lift at the bow ,a smaller starting hydrofoil can be placed at the bow ( little withe blade) .
I have a lot of experience with the comon designs rc and tethered boats and know how to counter to much lift at the bow sponson but now i want it different like the wige boats/planes .
For a first test i use a 2S Rigger from Graupner the Silver Bullet .
i start this tread as i want to show you my thought ,to set the sponson back to the cg.
I want this for SAW and for Oval racing as the rigger will less cickt by a wave at the bow .
Most waterairplane start with a design where the sponson are placed near the wing and the end of the sponson is often behind cg. As i want not to fly i will not use a wing or say a very small wing like a rotorblad from helicopter and very tini sponson .For start the rotorblad will be under water acting as a hydrofoil and there it will produce lot of lift .But when the boat is faster and going out of the water with the blade this lift will breack down doing hydrogliding and the rigger has to step up on the small sponson. To ad moore lift at the bow ,a smaller starting hydrofoil can be placed at the bow ( little withe blade) .
I have a lot of experience with the comon designs rc and tethered boats and know how to counter to much lift at the bow sponson but now i want it different like the wige boats/planes .
For a first test i use a 2S Rigger from Graupner the Silver Bullet .
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