When Sigurd Isacson in 1941 published this design in the Magazine "Flygning", he stated that an increase in flying weight (within reasonable limits) lead to an increase in flight duration. This statement caused much debate, but was found to be true. The reason was the the thick wing profiles commonly used were unsuitable for slow flying model aircraft. By increasing the weight and hence flying speed of the model, Reynolds number was increased and the wing profile worked better! Sigurd then developed his own series of wing profiles suitable for model flying, and was one of the pioneers in the development of thin wing profiles for low RE-numbers.
| Name: Nimbus | Alternative name: |
| Plan-ID (S-O L. numbering): B-215 | Owner: SMOS |
| Designer: Sigurd Isacson | Drawn by: |
| Year designed: 1941 | Wingspan (mm): 1000 |
| Category: Klass S1 | |
| Sources: Flygning | |
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Changed date: 2019-03-23
